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1
Vo, Thanh Liem, William Nash, Marco Del Galdo, Mohammad Rezania, Rich Crane, Mohaddeseh Mousavi Nezhad e Liberato Ferrara. "Coal mining wastes valorization as raw geomaterials in construction: A review with new perspectives". Journal of Cleaner Production 336 (febbraio 2022): 130213. http://dx.doi.org/10.1016/j.jclepro.2021.130213.
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Cuenca, Estefania, Marco Del Galdo, Oumayma Aboutaybi, Violeta Ramos, William Nash, Gavyn K. Rollinson, Jens Andersen, Rich Crane, Elhem Ghorbel e Liberato Ferrara. "Mechanical characterization of cement mortars and concrete with recycled aggregates from Coal Mining Wastes Geomaterials (CMWGs)". Construction and Building Materials 432 (giugno 2024): 136640. http://dx.doi.org/10.1016/j.conbuildmat.2024.136640.
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Petlovanyi, Mykhailo, Dmytro Malashkevych, Kateryna Sai e Serhii Zubko. "CONCEPTUAL FOUNDATIONS FOR A NON-WASTE TECHNOLOGY DEVELOPMENT OF MINING THIN COAL SEAMS". SCIENTIFIC PAPERS OF DONNTU Series: “The Mining and Geology”, n. 1(27)-2(28)2022 (2022): 7–17. http://dx.doi.org/10.31474/2073-9575-2022-1(27)-2(28)-7-17.
Testo completoAbstract (sommario):
Purpose. Development and generalization of a set of key elements for a non-waste technology concept of mining high-quality coal from thin coal seams, based on the processes of backfilling the mined-out space with waste rocks from stope and tunneling operations. Methods. A comprehensive methodical approach, containing the systematization and generalization of the constituent elements of a non-waste coal mining technology based on the implementation of theoretical studies and substantiations, is used in the research. Findings. The main hypothesis of a new approach to non-waste coal mining has been formed, in which the priority is not only the process of leaving the maximum waste rock volume in underground cavities, but also its use to form backfill mass, thereby improving the geomechanical conditions for mining thin coal seams. A wide range of mining tasks has been formulated and systematized for using a non-waste coal mining technology. The conditions for the harmonious functioning of the proposed conceptual scheme of a non-waste coal mining technology within the extraction field boundaries have been determined and substantiated. The conceptual foundations for the functioning of a new highly efficient non-waste technology for mining high-quality thermal coal from thin coal seams have been developed. Originality. The scientific novelty is in revealing the mechanism for the effective logistic functioning of rock-transport systems for the accumulation of waste rocks in the underground space using a non-waste technology of coal mining from thin coal seams. Practical implication. The research results can be used in planning non-waste technological schemes for mining the coal with an increased energy potential. Keywords: non-waste technology, waste mine rocks, backfill, selective mining, stope, drifting face, transportation.
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Malashkevych, Dmytro, Mykhailo Petlovanyi, Kateryna Sai, Pavlo Saik e Iryna Klymenko. "INCREASING THE ENERGY POTENTIAL OF COAL WHILE DEVELOPMENT OF LOW-THICKNESS RESERVES IN THE WESTERN DONBAS MINES". Journal of Donetsk Mining Institute 51, n. 2 (2022): 67–77. http://dx.doi.org/10.31474/1999-981x-2022-2-67-77.
Testo completoAbstract (sommario):
Purpose. Development and generalisation of a set of key elements for a non-waste technology concept of mining high-quality coal from thin coal seams, based on the processes of backfilling the mined-out space with waste rocks from stope and tunnelling operations. Methods. A comprehensive methodical approach, containing the systematisation and generalisation of the constituent elements of a non-waste coal mining technology based on the implementation of theoretical studies and substantiations, is used in the research. Findings. The main hypothesis of a new approach to non-waste coal mining has been formed, in which the priority is not only the process of leaving the maximum waste rock volume in underground cavities, but also its use to form backfill mass, thereby improving the geomechanical conditions for mining thin coal seams. A wide range of mining tasks has been formulated and systematised for using a non-waste coal mining technology. The conditions for the harmonious functioning of the proposed conceptual scheme of a non-waste coal mining technology within the extraction field boundaries have been determined and substantiated. The conceptual foundations for the functioning of a new highly efficient non-waste technology for mining high-quality thermal coal from thin coal seams have been developed. Originality. The scientific novelty is in revealing the mechanism for the effective logistic functioning of rock-transport systems for the accumulation of waste rocks in the underground space using a non-waste technology of coal mining from thin coal seams. Practical implications. The research results can be used in planning non-waste technological schemes for mining the coal with an increased energy potential.
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Harionovskij, A. A., V. Yu Grishin, K. S. Kolikov e N. P. Udalova. "Problems of using coal mining waste". Mining informational and analytical bulletin, n. 10-1 (2021): 45–55. http://dx.doi.org/10.25018/0236_1493_2021_101_0_45.
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Zhang, Dong Sheng, Tao Dong e Gang Wei Fan. "Clean Mining Technology of Waste Not Discharged From Coal Mine". Advanced Materials Research 524-527 (maggio 2012): 552–56. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.552.
Testo completoAbstract (sommario):
In order to solve the problem of heaping waste in aboveground, a cleanly mining technique of waste not discharged from coal mine was proposed. It includes two key points as follows: one is waste separation underground; the other is mining technique with preset packing body of waste without coal pillars. After the waste from the coal mining face had been separated out, the waste was used to preset packing body of waste. It is able to decrease stress of mine hoisting. The technique has been successfully used in Gaozhuang Coal Mine.
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S., Shom, Sushil Mhaske, Khanindra Pathak e Manoj Tiwari. "Mine Waste as Resource: Indian Mining Scenario of Coal and Non Coal Mining Sector". International Journal of Recent Technology and Engineering 9, n. 6 (30 marzo 2021): 250–52. http://dx.doi.org/10.35940/ijrte.f5396.039621.
Testo completoAbstract (sommario):
Mother Nature has bestowed India with huge resources of coal, iron ore, bauxite, manganese and limestone. India has one of the lowest per capita availability of land due to population of more than 1.3 billion. The transformation from under developed to developed economy warrants enormous increase in mineral production. This will generate additional huge quantities of waste. The industry is already facing problems related to land acquisition and environmental clearances. Sustainable development of Indian mineral industry requires reprocessing, reuse and recycling of mine waste. To achieve this, economic and innovative mineral processing methods are required which will result in least damage to ecology and environment.
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Zhang, Qiang, Jixiong Zhang, Zhongya Wu e Yang Chen. "Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China". Sustainability 11, n. 7 (9 aprile 2019): 2118. http://dx.doi.org/10.3390/su11072118.
Testo completoAbstract (sommario):
China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper summarizes the research progress of the solid backfilling mining technology and then illustrates the realistic demands and significance of implementing underground coal-waste separation. It also focuses on the technical principles, systems and key equipment of the common underground coal-waste separation methods, such as the selective crushing method, the dense medium shallow groove method, the vibro-assisted jigging method and full-size water separation method and ray identification method. In addition, the selection steps of underground coal-waste separation method, the design process of large section separation chamber and the design principle of separation and backfilling system are proposed, finally, the mining-separating-backfilling + X for coal mining is put forward. By combining the technology of mining-separating-backfilling with other technologies, such as gob-side entry retaining with non-pillar mining, gas extraction, solid waste treatment, water protection mining, mining under buildings, railways and water bodies, the integrated mining methods, mining-separating-backfilling + setting pillars, gas drainage, treatment, protection and prevention methods are formed. It also introduced the ‘mining-separating-backfilling + gas extraction’ technology’s whole idea, system arrangement, separation equipment and practical engineering application effects based on the specific engineering case of pingmei no. 12 coal mine. The results indicate that the integration of underground coal-waste separation and solid backfilling technology could achieve gangue discharging reduction, underground washing and surface subsidence control. It is effective at realizing green mining.
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OPARIN, V. N., N. M. KACHURIN, T. A. KIRYAEVA e V. P. POTAPOV. "ON THE PROBLEM OF DEVELOPING THE EXPERIMENTAL AND ANALYTICAL FOUNDATIONS OF THE THEORY OF INTERACTION OF GEOMECHANICAL AND PHYSICAL AND CHEMICAL PROCESSES DURING THE MINING OF COAL DEPOSITS". News of the Tula state university. Sciences of Earth 3, n. 1 (2023): 503–21. http://dx.doi.org/10.46689/2218-5194-2023-3-1-503-521.
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The article is devoted to the problem of safe subsoil use of the Earth in the increasingly complex mining-geological and natural-climatic conditions, the increase in the depth and scale of the developed mineral deposits of various types and phase state. It is shown that in our country such achievements in the direction of fundamental and applied research and development are related to establishing general formation mechanisms and evolution features of focal zones of increased stress concentration and destruction rock masses and geomaterials with block-hierarchical and multiphased structure; these geomaterials have properties of open self-arranging geosystems in tectonic field of stress and strain. Based on modern achievements of non-linear geomechanics and geophysics, cloud information technologies of BigData, the new (energetic) methodological approach and corresponding methods have been justified, as well as technical (measuring) means and software complexes for formation multilayered geoinformation monitoring system for diagnostics control and prediction of industrial and ecological safety at strategically important mining areas in Siberia, which has been approved in field conditions (Kuzbass, Norilsk and Novosibirsk Region).
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Probierz, Krystian, Łukasz Gawor, Iwona Jonczy e Marek Marcisz. "Valorization of coal mining waste dumps from he mines of Katowicki Holding Węglowy". Gospodarka Surowcami Mineralnymi 33, n. 1 (1 marzo 2017): 35–50. http://dx.doi.org/10.1515/gospo-2017-0006.
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Abstract The cataloging of over 220 coal mining dumping grounds after hard coal mining was carried out on the area of the Upper Silesian Coal Basin (USCB). Considering the significant content of coal particles in the waste, these object may be perceived as perspective anthropogenic deposits. In order to define the possibilities of recovery, an attempt of linking the quality of coal in the deposit and the in waste material was performed. Another step is the reclamation and use of dumping grounds after completing effective recovery processes. The purpose of the research was the cataloging, mapping and valorization of coal mining waste dumps from Katowicki Holding Węglowy coal mines, for the needs of reclamation and management of examined objects and defining the potential recovery of coal from the dumps. The valorization of the post-mining waste dumps was done with the use of original methodology, considering the problems of: reclamation, management, accessibility of the dumps as well as environmental hazards. T he directions of the technical reclamation (e.g. landscape objects, tabular dumps) and biological reclamation (e.g. forest direction, mixed reclamation (grass and tree reclamation), grass cultivation, lack of reclamation) were defined. Accessibility with regard to open access/closing of the dump area and the roads leading towards the object were evaluated. T he connection of coal quality in the deposits of KHW S.A. and in waste material enabled the definition and evaluation of the potential possibilities of recovery of coal from the post mining dumping grounds.
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Gao, Ming Tao, Ming Zhang e Ming Zhou. "Study and Practice on the Technology of Filling Mining in Xin Wen Mining Area". Applied Mechanics and Materials 121-126 (ottobre 2011): 2892–96. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2892.
Testo completoAbstract (sommario):
Because of mine production, the open-pit enission of coal gangue solid waste and surface subsidence are one of important causes to failure the mining area land and environment, so the key technology, processes and equipment of filling mining to replace coal have been developed, which convergences the existing system of mining technology, And the stability theory of the control of filling mining rock movement and the method of surface subsidence prediction have been established, which provides a scientific basis for equipment Selection and the design of subsidence control; the key technologies of filling mining to replace coal is successfully applicated, which significantly improves the recovery rate of coal resources in China and constructs the new coordinated development model that is combined by the underground disposal of coal waste, mining subsidence control and the “under three”safe coal mining, through the above, the target of green mining and the coordinated development of mining social, economic and environmental will be achieved.
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Zhang, Feng, Jinxiao Liu, Haiming Ni, Wenxin Li e Yongle Liu. "Development of Coal Mine Filling Paste with Certain Early Strength and Its Flow Characteristics". Geofluids 2021 (31 gennaio 2021): 1–14. http://dx.doi.org/10.1155/2021/6699426.
Testo completoAbstract (sommario):
In coal mine paste filling technology, geomaterials like coal gangue and fly ash are used as the main component, and cement is applied as the cementing material. In the mining production, mining-and-filling is a cyclic work, where the filling immediately after mining and mining immediately after filling. Long solidification time after filling will affect mining; consequently, the paste should have early strength. In addition, the prepared paste will be conveyed to goaf through the pipeline. The paste flow characteristics will change to some extent in the conveying process, and there is uncertainty about whether the paste can meet the requirements of pumpability and strength. Therefore, the influence of pipeline conveying on flow characteristics of paste before filling the goaf should be taken into consideration. Based on the above two points, this paper studies the paste strength, backfill strength, and pumpability parameters in coal mine paste filling and determines the early and later strength of coal mine paste, as well as the pumpability parameters such as slump degree, segregation degree, setting time, and paste gradation. With the determined mass proportion of coal gangue, fly ash, and silicate cement, the orthogonal test was carried out with three factors including gypsum content, the content of early strength agent (Na2SO4), and the mass concentration, and at three levels. The factors affecting paste flow characteristics were determined by range analysis, and the factors affecting the paste’s early strength were determined by the XRD test and SEM test on its microstructure. With paste proportioning and pipeline conveying simulation system, taking slump, segregation degree, backfill strength, and other parameters as indicators, we obtain the influence law of pipeline conveying on the flow characteristics of paste. The research has great theoretical and practical significance for developing coal paste with early strength and its flow characteristics.
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Malashkevych, Dmytro, Mykhailo Petlovanyi, Kateryna Sai e Serhii Zubko. "Research into the coal quality with a new selective mining technology of the waste rock accumulation in the mined-out area". Mining of Mineral Deposits 16, n. 4 (30 dicembre 2022): 103–14. http://dx.doi.org/10.33271/mining16.04.103.
Testo completoAbstract (sommario):
Purpose. The research purpose is to study the formation of quantitative-qualitative indicators of mined coal under conditions of dynamic changes in space and time with a new stope mining technology with waste rock accumulation in the underground mined-out area. Methods. The contours are formed for mining low-thickness coal reserves and extracting thicknesses, undercut rock volumes in the stoping and preparatory faces in the conditions of the Heroiiv Kosmosu mine. The average density values of coal, rock layers and wall rocks in the seam within the boundaries of mining contours are determined based on the geological data of wells and mining operations. The graphic basis is executed in the AutoCAD program. A digital spatial model of the С10t seam contours is used, according to the schedule for organizing stope and preparatory operations. The volumes of waste rocks and minerals involved in the formation of quantitative-qualitative rock mass indicators in a given time period are calculated. Findings. It has been determined that during mining of coal reserves from the studied mining area (equal to extraction site), the volume of production and the operational coal ash content in the mining technology with waste rock accumulation averages 376.5 thousand tons and 15.2%, while with traditional technology – 621.3 thousand tons and 46.7%. Nevertheless, it has been proven that in terms of energy equivalent, the value of mined coal using the mining technology with waste rock accumulation is higher by 7.4% than the traditional technology (9.6 TJ versus 8.9 TJ). Originality. For the first time, a mechanism for the formation of operational ash content and energy value of coal has been revealed when combining the processes of drifting operations to prepare reserves from new extraction pillars with associated stope operations into a new selective mining technology with waste rock accumulation in the mined-out area. Practical implications. An algorithm for predicting the operational ash content and quality of coal when using selective mining technology with waste rock accumulation in the mined-out area has been developed, which is important for the technical and economic indicators of coal mines.
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Gawor, Łukasz. "Polish legal regulations considering recovery of secondary materials from coal mining dumping grounds". Environmental & Socio-economic Studies 2, n. 4 (1 dicembre 2014): 43–46. http://dx.doi.org/10.1515/environ-2015-0049.
Testo completoAbstract (sommario):
Abstract In the article there is presented temporary situation of coal mining dumping grounds in Poland – their inventarization, localization and environmental impacts. The coal mining dumping grounds in Poland are situated in three coal basins: Upper Silesian Coal Basin, Lower Silesian Coal Basin and Lublin Coal Basin. In all mentioned areas occur ca. 270 coal mining waste dumps, covering surface of over 4400 ha. The main environmental impacts connected with dumping grounds are fire hazards, water pollution and a danger of slope sliding. The question of recovery of coal from disposed wastes with regard to legal regulations is discussed. There are presented technical methods of coal recovery considering environmental protection issues. There is a necessity and technical possibility of recovery of coal from the coal-mining waste dumps. The coal recovery reduces hazards of self-ignition and fires of the dump. It is also economically justified. The analysis of required regulations in legal system in Poland for safe exploitation of secondary materials from coal mining dumps is done. Socio-economic aspects of recovery of coal are discussed. The valid legal regulations in Poland regulate the issues connected with coal mining dumping grounds in a very general way. It is necessary to prepare supplements to the legal provisions or new regulations concerning post-mining dumping grounds.
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Li, Jian Sheng, Dong Wang e Tian He Kang. "Environmental Problems and Strategies Caused by Coal Mining". Advanced Materials Research 433-440 (gennaio 2012): 2071–76. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.2071.
Testo completoAbstract (sommario):
The environmental problems about destruction and pollution of water resource, destruction and occupation of land resource, and air pollution in coal mining was described. Green mining technology in terms of the solution in environmental problems caused by coal mining was introduced. The main content of green mining includes reduction of rock waste, simultaneous extraction of coal and coal-bed methane, water-preservation in mining areas, coal mining to retard surface subsidence, and underground coal gasification. Green mining harmonizing with resources and environment is the fundamental method to solve environmental problems caused by coal mining. In order to develop green mining technology, the economic evaluation of green mining and the establishment of relevant laws need to be further strengthened.
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BRYK, Dmytro, Oleg GVOZDEVYCH, Lesya KULCHYTSKA-ZHYHAYLO e Myroslav PODOLSKYY. "Technogenic carbonaceous objects of the Chervonohrad mining and industrial district and some technical solutions for their using". Geology and Geochemistry of Combustible Minerals 4, n. 181 (27 dicembre 2019): 45–65. http://dx.doi.org/10.15407/ggcm2019.04.045.
Testo completoAbstract (sommario):
Ukraine has significant coal resources. Chervonohrad Mining and Industrial District is the main coal complex in the west of Ukraine. In recent years, the average annual coal production in the mines of Chervonohrad Mining and Industrial District has amounted to 1.5 bn t, coal ash varies over a wide range of 25 to 53 %, average coal ash content of about 40 %. Coal mining has produced millions of tons of coal waste every year. Concentration of technogeneous coal objects (mines, mining infrastructure, coal-mining waste dumps and wastes of coal enrichment) in a relatively small area has caused environmental degradation. Therefore, technological and environmental aspects of carbon-containing technogenic objects are particularly important and actual. Coal-waste dumps in the territory of Chervonohrad Mining and Industrial District are characterized in detail. The dumps cover different areas – from 9–10 to 29–30 ha, the height of the dumps reaches 62 m at the mostly heights of 25–40 m. The total waste deposit in the dumps of existing mines has a volume of more than 20 million m3. The coal wastes from Mezhyrichanskaya mine coal-waste dump was investigated to determine the suitability for thermochemical processing. Technical characteristics of taken coal-waster samples is presented. The technogenic carbonaceous objects and the impact to the environment are evaluated. The developed and patented technical and technological solutions for the technogenic carbonaceous objects using are considered. It is shown that the concept of industrial development of coal wastes dumps is based on two aspects – extraction of valuable mineral components and energy utilization of carbonaceous wastes of coal production. Its patented as Patents of Ukraine technological schemes for terrestrial process in of solid carbonaceous raw material from dumps and sludges with the production of coal tar and synthesis gas CO + H2 are presented, as well as the scheme of a system for utilization of heat from coal dump. Recommendations for the implementation of innovative technologies are based on the results of the laboratory research. The purpose of the resolution is to obtain valuable components and energy from coal wasters while improving the environment.
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Zang, Chuan Wei, Chuan Le Ma e Xue An Zhuang. "Research of New Filling and Mining Technology Using Waste Rocks in Steep Coal Seams". Applied Mechanics and Materials 204-208 (ottobre 2012): 1395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1395.
Testo completoAbstract (sommario):
During the extraction of steeply inclined coal seams, the coal recovery ratio is low be-cause of the coal pillar loss and the production of waste rock is high due to lots of rock roadways which causes serious environmental pollution. This status is conflicted with the strategy of Clean Coal Mining and Green Coal Mining in China, so it is necessary to develop new coal mining method. In this paper, Downward Stratified Gangue Self-filling Method on the Flexible Shield (DSGSMFS) is put forward first. It means that the coal face is lain horizontally and advances along the dip; the flexible shield is used to separate the gob area; the waste rocks are self-filled downward to the top the shield; the coal is broken by drilling and blasting method under the shield, and the broken coal is transported by the electrical winch and the scraping mucker; the flexible shield moves downward automatically by the weight of itself and waste rocks. Field test shows that the strata displacement is effectively controlled by using DSGSMFS, so some coal pillars are recovered; as a result the problem of large quantity gangue and low coal recovery ratio in steep coal seam is solved. DSGSMFS is proved to be a new hopeful and effective coal green mining method.
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Vergelska, N. V., e E. I. Skopychenko. "MONITORING THE COAL WASTE HEAPS OF MINES OF DONETS BASIN". Mining Geology & Geoecology, n. 1(2) (24 gennaio 2022): 52–63. http://dx.doi.org/10.59911/mgg.2786-7994.2021.1(2).251869.
Testo completoAbstract (sommario):
In recent years, much attention has been paid not only to the rational extraction of minerals, but also to the ecology of coal-mining regions. Monitoring of man-made landscapes of coal mining enterprises is a topical study from the standpoint of environmental impact of coal mine heaps.
The impact of coal mining on the lithosphere, hydrosphere, atmosphere and climate change has become even more relevant with global research on its impact on climate change. All coal basins are characterized by the presence of waste heaps and their significant impact on the soil: the rise of groundwater and the migration of chemical compounds from waste heaps into the soil, the expansion of waste heaps by area. Changes of heaps under the influence of exogenous factors are established. Peculiarities of gas distribution and chemical composition of waste heaps are determined.
It is expedient to carry out full reclamation on the territory of closed mines, to improve the ecological condition of technogenic-loaded (mining) regions and to give preference to complex ecological-industrial-tourist projects.
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Petkova, N. V., e B. Y. Kornienko. "GIS METHODS FOR MONITORING TECHNOGENIC DISTURBANCE OF LAND IN THE SVERDLOVSK COAL DISTRICT (LUHANSK REGION)". ECOLOGY ECONOMY INFORMATICS. GEOINFORMATION TECHNOLOGIES AND SPACE MONITORING 2, n. 5 (2020): 43–49. http://dx.doi.org/10.23885/2500-123x-2020-2-5-43-49.
Testo completoAbstract (sommario):
Currently, the coal industry is one of the environmentally unfriendly industries of the world economy. Industrial activities of coal mining enterprises lead to pollution of the atmosphere and other living environments most strongly associated with the atmosphere, especially the soil, causing considerable damage to natural ecosystems, land use and other sphere of human activities. The possibility of using geoinformation technologies and remote sensing data in solving the problems of man-made violation of territories in areas of coal mining is presented in this report. A method for determining the location of coal mining waste heaps and updating their spatial characteristics using geoinformation systems based on satellite data from open sources is proposed. The research was carried out on the example of the Sverdlovsk district of the Luhansk region, where the tasks of accounting and control, utilization and reclamation of coal industry waste are of paramount importance. As a result of the study, all available waste heaps of the coal mining industry in the study area were identified and described. The problem of inappropriate land use occupied by waste from the coal industry is considered. Examples of mapping processes of formation of rock dumps based on historical high-resolution images are given
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Zha, Hao, Weiqun Liu e Qinghong Liu. "Self-Designed Hydrophilicity-Related Geomaterials and Their Testing Utility in Simulation of Overlying Strata Instability". Advances in Materials Science and Engineering 2019 (10 ottobre 2019): 1–11. http://dx.doi.org/10.1155/2019/5290524.
Testo completoAbstract (sommario):
This paper mainly involved the testing of self-designed hydrophilicity-related geomaterials and application of overlying strata monitoring in a mining area in Northwest China. We employed the orthogonal testing technique to select the ingredient ratio of hydrophilicity-related geomaterials and optimized the mechanical properties of materials, such as density, elastic modulus, Poisson ratio, compressive strength, tensile strength, and water absorption rate on the basis of regression analysis. It can be seen that the proportion of the mixture clearly determines the mechanical properties of similar materials. Among them, the content of silicone oil and the cement-Vaseline ratio have the most obvious effects on the mechanical properties of the material. By using the hydrophilicity-related geomaterials with ingredient optimization, we built a physical model to simulate the failure progress of the workface in one of the coal mines in Northwest China. It was shown that three remarkable characteristic parts, including collapse zone, fissure zone, and layer-separating space, appear in the overlying strata. Furthermore, the fractured zone above the separating band is just located under the main aquifer. Finally, compared with in-field data, it was verified that the height of the collapse zone and water-guiding fissure zone measured at three boreholes are in good agreement with the experiment. Thus, the failure mode of overburden and the vertical stress and displacement changes are consistent with the actual engineering. Self-developed hydrophilicity-related geomaterials can be applied to laboratory physical simulation experiments of overlying strata. It provides the basis for future research on large-scale physical water-containing similar simulation experiments.
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Kray, Claudio Henrique, Marino José Tedesco, Carlos Alberto Bissani, Clesio Gianello e Kelly Justin da Silva. "Tannery and coal mining waste disposal on soil". Revista Brasileira de Ciência do Solo 32, spe (dicembre 2008): 2877–82. http://dx.doi.org/10.1590/s0100-06832008000700035.
Testo completoAbstract (sommario):
Tannery residues and coal mine waste are heavily polluting sources in Brazil, mainly in the Southern States of Rio Grande do Sul and Santa Catarina. In order to study the effects of residues of chrome leather tanning (sludge and leather shavings) and coal waste on soybean and maize crops, a field experiment is in progress since 1996, at the Federal University of Rio Grande do Sul Experimental Station, county of Eldorado do Sul, Brazil. The residues were applied twice (growing seasons 1996/97 and 1999/00). The amounts of tannery residues were applied according to their neutralizing value, at rates of up to 86.8 t ha-1, supplying from 671 to 1.342 kg ha-1 Cr(III); coal waste was applied at a total rate of 164 t ha-1. Crop yield and dry matter production were evaluated, as well as the nutrients (N, P, K, Ca, Mg, Cu and Zn) and Cr contents. Crop yields with tannery sludge application were similar to those obtained with N and lime supplied with mineral amendments. Plant Cr absorption did not increase significantly with the residue application. Tannery sludge can be used also to neutralize the high acidity developed in the soil by coal mine waste.
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Ferreira, Leticia Patricio, Thuani Gesser Müller, Maykon Cargnin, Camila Machado de Oliveira e Michael Peterson. "Valorization of waste from coal mining pyrite beneficiation". Journal of Environmental Chemical Engineering 9, n. 4 (agosto 2021): 105759. http://dx.doi.org/10.1016/j.jece.2021.105759.
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Leventhal, A. R., e L. P. de Ambrosis. "Waste disposal in coal mining—a geotechnical analysis". Engineering Geology 22, n. 1 (settembre 1985): 83–96. http://dx.doi.org/10.1016/0013-7952(85)90040-7.
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Chang, Qingliang, Jianhang Chen, Huaqiang Zhou e Jianbiao Bai. "Implementation of Paste Backfill Mining Technology in Chinese Coal Mines". Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/821025.
Testo completoAbstract (sommario):
Implementation of clean mining technology at coal mines is crucial to protect the environment and maintain balance among energy resources, consumption, and ecology. After reviewing present coal clean mining technology, we introduce the technology principles and technological process of paste backfill mining in coal mines and discuss the components and features of backfill materials, the constitution of the backfill system, and the backfill process. Specific implementation of this technology and its application are analyzed for paste backfill mining in Daizhuang Coal Mine; a practical implementation shows that paste backfill mining can improve the safety and excavation rate of coal mining, which can effectively resolve surface subsidence problems caused by underground mining activities, by utilizing solid waste such as coal gangues as a resource. Therefore, paste backfill mining is an effective clean coal mining technology, which has widespread application.
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Diachenko, N. O., e O. O. Dyatel. "COAL INDUSTRY: ENVIRONMENTAL IMPACT AND WASTE MANAGEMENT ASSESSMENT". Mining Geology & Geoecology, n. 1 (8 dicembre 2020): 60–72. http://dx.doi.org/10.59911/mgg.2786-7994.2020.1.234275.
Testo completoAbstract (sommario):
A study was carried out to assess the environmental and technical indicators of coal enterprises activities in coal mining and formation and waste treatment trends statistical data. It is proposed to analyze waste management trends using dimensionless coefficients (Krec, Kincin, Kland): recycling, incineration or landfill disposal. They are indicators of time dependence and represent a mathematical expression in the form: the ratio of recycled, incinerated or disposed volumes of waste to the volume of waste generated per year. The expediency of using the specific emission of pollutants' values for each pollutant and from each source of emission has been substantiated in general for production. It has been proven that such an approach allows the practical possibility of objective control over the actual emissions of pollutants and establishes a relationship between the amount of pollutant emitted and the activity or inaction associated with this ejection. It has been established that in recent years, the decline in coal mining has led to an unjustified increase in emissions of pollutants at many state-owned enterprises. It has been established that minimization of generating, reuse, recycling and recovery of waste is in no way reflected in the waste measures for the management mining industry waste, but it rather reflects a slowdown in measures to protect and preserve the environment. It has been proven that the main method used in Ukraine is the creation of dumps or storage facilities. Calculation of the operations ratio with waste (utilization, incineration, disposal) to the volume of formation of the latter showed that Krec is gradually decreasing, while Kland displays an active increase (by 1.5 times). It is concluded that the EU directives on waste management are not fully implemented (primarily, this concerns waste recycling); it is advisable to provide either the reuse of the mining waste, or the adding value - by converting waste into something else.
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Petlovanyi, Мykhailo V., Dmytro S. Мalashkevych e Kateryna S. Sai. "The new approach to creating progressive and low-waste mining technology for thin coal seams". Journal of Geology, Geography and Geoecology 29, n. 4 (27 dicembre 2020): 765–75. http://dx.doi.org/10.15421/112069.
Testo completoAbstract (sommario):
The problem of mining low-thickness coal seams in the Western Donbas is described in the article. Technological, economic and environmental reasons reducing the effectiveness of traditional technologies for their development are analyzed in detail and the new progressive approach is proposed to solve it. Attention is paid to the importance of hard coal for Ukraine energy independence and thin coal seams, which is the lowest indicator among coal deposits exploited in the developed countries worldwide. The key role of the Western Donbas mines in the Ukraine coal mining industry development is shown, where coal seams with a geological thickness in a range of 0.55 – 0.80 m take more than 50% of coal reserves. It leads to coal clogging and rising of the further enrichment costs. The interrelation of mining, geological seam thickness, and wall rock undercut is established, as well as decade-long tendency out of seam size increase is evaluated. It appropriately correlates with the general tendency of a geological thickness decrease and it leads to an increase of total ash content. The sources are defined and the volumes of waste rock run from coal mine to the surface are quantified, where 80 – 90% are underground mine working development and wall rock undercut while longwall mining operations. The negative influence of the applied mining technologies for low-thickness seams is shown. Whereby existing waste rock dumps are additionally replenished annually by 3.0 – 3.5 million of large-sized coal enrichment wastes and transported back onto waste rock dumps for very high expenses. It is determined that three waste dumps are located near urban settlements, which increases the environmental fee for their placement in three times. The new approach for selective mining of low-thickness seams with rock undercut placement in the gob area is proposed and it is characterized by the addition to the mechanized support of horizontally-closed scraper backfilling conveyor with a tamping device for rock compaction, which reduces the mine rock output by 25 – 30%. The preliminary calculations of parameters and prospective economic efficiency of the proposed mining technology for low-thickness coal seams are carried out in case of one typical longwall face taking into account the mined rock transportation cost to coal-preparation plant and its enrichment, reducing the cost of mine working supports. Its technology is by 17% more cost effective, than traditional mining technology while rough coal ash content does not exceed 21%.
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Song, Weijian, Jixiong Zhang, Meng Li, Hao Yan, Nan Zhou, Yinan Yao e Yaben Guo. "Underground Disposal of Coal Gangue Backfill in China". Applied Sciences 12, n. 23 (25 novembre 2022): 12060. http://dx.doi.org/10.3390/app122312060.
Testo completoAbstract (sommario):
China’s total coal production in 2021 exceeded 4.13 billion tons, 52% of the world’s total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the existing gangue backfilling methods, their working principles, efficiency, and application status. The methods that are meeting Middle and Western China’s mining demands are discussed in detail. The state-of-the-art technologies that can realize high-efficiency, centralized, and large-scale underground backfilling of coal gangue are analyzed. This paper shows that the industrial implementation of these technologies can increase the current maximum disposal capacity of coal gangue by three times, reaching five million tons per year. The equipment innovation and automation are analyzed, and the environmental effect of coal gangue backfilling is discussed. This review offers inspirations and guidelines for coal gangue disposal and the environmental hazard reduction of coal mining.
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Mitko, Krzysztof, e Marian Turek. "Membrane-Based Solutions for the Polish Coal Mining Industry". Membranes 11, n. 8 (18 agosto 2021): 638. http://dx.doi.org/10.3390/membranes11080638.
Testo completoAbstract (sommario):
Poland still relies largely on coal for energy generation, which creates environmental problems connected to the mining process, particularly the issue of saline waste water discharge. Membrane-based zero liquid discharge systems can be employed to recover important resources from coal mine waste waters, such as demineralized water, salt, magnesium hydroxide, and gypsum. In this paper, we present a historical overview of proposed membrane-based solutions for the Polish coal mining industry and discuss possible further areas of research.
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Morman-Wątor, Justyna, e Elżbieta Pilecka. "An Analysis of the Use of Mining Waste from Coal Mines in Flood and Road Embankments". Energies 17, n. 13 (5 luglio 2024): 3303. http://dx.doi.org/10.3390/en17133303.
Testo completoAbstract (sommario):
This article presents the possibilities of using mining waste from hard coal mines in flood and road embankments. For this reason, the management of mining waste is a very important issue. It was proposed to use mining waste to build flood embankments that also serve as a road. The results of research and numerical analyses using the Finite Element Method (FEM) are presented for the example of mining waste from the Sobieski Mining Plant. The results of testing the physical and mechanical properties of the waste, waste with the addition of 8% Portland cement and waste with the addition of 8% metallurgical cement are presented. The results of laboratory tests showed better physical and mechanical properties for mining waste with the addition of metallurgical cement. The results of the numerical analyses showed that no flood embankment built of mining waste alone retained the required stability coefficient according to Polish requirements (FoS > 1.3) at the highest flood wave. The best result is achieved by the flood embankment in the variant—the road being on the side of the air slope, built from mining waste with the addition of 8% metallurgical cement; this has the highest stability coefficient, both without a vehicle load (FoS = 1.72) and with a vehicle load (FoS = 1.67).
30
Lv, Wen Yu, e Zhi Hui Zhang. "Current Situation and Prospect of Coal Backfill Mining Technology". Advanced Materials Research 524-527 (maggio 2012): 421–25. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.421.
Testo completoAbstract (sommario):
This paper introduces the classification of the coal backfill mining method and analyzes current technology statuses of several coal backfill mining technologies: waste backfill mining technology, paste backfill mining technology and abscission layer grouting backfill mining technology. Based on the analysis of current backfill mining technology statuses, this paper puts forth that the backfill mining technology should focus on the problem of the lack of coal backfill mining capacity, research on the role of backfill mining rock movement needing to be strengthened, filling efficiency and economy needed to improved through reasonable optimization of backfill mining parameter, so it can provide the theoretical basis for backfill mining design.
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Valiev, Niiaz G., Sergei G. Stradanchenko, Stanislav A. Maslennikov, Maksim A. Golodov e Vitalii N. Armeiskov. "Environmental protection of a coal-mining region". Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal 1, n. 7 (11 novembre 2021): 80–91. http://dx.doi.org/10.21440/0536-1028-2021-7-80-91.
Testo completoAbstract (sommario):
Research objective is to substantiate the relevance of mining transition to eco-friendly technologies of subsurface use. Methods of research include analyzing theory and practice of environmental technologies application and carrying out a multifactor experiment. Results. An efficiency criterion for mineral resources extraction technologies is proposed that involves reducing the effect made by the by-products of mining and processing enterprises on the state of the environment. The problem is considered of minimizing the environmental damage from storing silt coal in dumps and storages by utilizing their components. The mechanism of environmental pollution has been formulated. Aspects of metal recovery from beneficiation tailings in a disintegrator mill are investigated. A reduced threat to living matter is predicted by implementing the concept of radical waste-free processing of substandard mineral raw materials. The need to improve the processes of crushing, fine grinding, and classification of minerals in mills to reduce the waste of coal production, harmful to the environment, is noted. Conclusions and scope of the results. Deteriorated conditions of mineral deposits development raise the risk of man-made impact on the environment in coal-mining regions. The global human population grows resulting in increased resources production to respond to resource needs. The growing threat to living matter can be reduced by radical measures, the non-waste processing of substandard mineral raw materials being the priority. The research results can be helpful in the development of deposits of solid metal-containing technologically exposed ores
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Buzylo, Volodymyr, Artem Pavlychenko e Olena Borysovska. "Ecological aspects of filling of worked-out area during underground coal mining". E3S Web of Conferences 201 (2020): 01038. http://dx.doi.org/10.1051/e3sconf/202020101038.
Testo completoAbstract (sommario):
The ecological consequences of underground coal mining and the mechanisms of transformation of the rock mass and the earth's surface are determined. To increase the efficiency of environmental activities of coal mining enterprises, the expediency of introducing the technology of stowing of the worked-out areas with grouting solutions using rock from dumps, ash, waste from coal processing plants is substantiated. The implementation of the proposed technological solutions will ensure the protection of land, buildings and structures from under-mining, as well as improve the environmental situation in coal mining regions.
33
Gao, Yang, Wu Xiao, Yang Yu, Li Jiang Xu, Fang Shao e Ji Yong Zeng. "Comprehensive Treatment of Coal Waste Piles with Spontaneous Combustion". Applied Mechanics and Materials 533 (febbraio 2014): 384–89. http://dx.doi.org/10.4028/www.scientific.net/amm.533.384.
Testo completoAbstract (sommario):
Coal waste is the inevitable outcome during coal mining and processing and its output is more and more tremendous. The underutilized coal waste accumulates and forms waste pile. Its spontaneous combustion could lead to serious environmental problem, indicating it is particularly important to comprehensively treat the coal waste piles with spontaneous combustion. According to the mechanism and characteristic of coal waste piles with spontaneous combustion, this study classified the treatment in the different periods into diagnosis of spontaneous combustion, extinguishment, fire prevention and vegetation restoration. Furthermore, were viewed the advance in studying comprehensive treatment of coal waste piles with spontaneous combustion and we expected to supply the reference for selecting treatment of coal waste piles with spontaneous combustion.
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Angioletto, Elcio, Thauan Gomes, Eduardo Scheffer Magnus, Agenor de Noni Júnior e Elidio Angioletto. "Desulfurization of coal pyrite tailings with ozone". Journal of Environmental Analysis and Progress 9, n. 3 (12 agosto 2024): 188–95. http://dx.doi.org/10.24221/jeap.9.3.2024.6078.188-195.
Testo completoAbstract (sommario):
Mining is an important sector of the economy, and in the southern region of Brazil, coal mining stands out. This activity generates waste with a high pyritic content, which causes environmental problems such as acid mine drainage (AMD). Therefore, studies that aim to beneficiate or treat this waste are of high relevance. In this study, an alternative for desulfurizing pyritic waste using ozone was investigated. Ozone treatment of mining tailings suspension was evaluated as a new strategy for sulfur removal. Particle size analysis, sulfate content, ferrous ion concentration (and total iron), pH, Eh, conductivity, and X-ray fluorescence were performed. Furthermore, a kinetic analysis of ozone consumption was established. The behavior of sulfate and hydrogen ion concentrations indicates that sulfuric acid is the main reaction product, and conductivity suggests that ion release is continuous over the ozonation time. A reaction kinetics with ??1.2 was found for ozone depletion, which aids in predicting the dosage to be applied on a larger scale. This study represents a contribution to the search for alternatives for treating pyritic waste and contributes to the understanding of the reaction rate of ozone consumption in this type of reaction.
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Pandey, Shraddha, S. S. Dhuria e Gayatri Devi. "Environmental Risks Due to Heavy Metal Pollution of Water Resulted from Coal Mining Wastes in Korba Chhattisgarh, India". Ecology, Environment and Conservation 29, n. 04 (2023): 1704–8. http://dx.doi.org/10.53550/eec.2023.v29i04.040.
Testo completoAbstract (sommario):
The mining waste facilities in the Dipka coal mining region of Korba are a result of coal extraction and coal washeries. Acid mine drainage (AMD), which poses a risk to the environment, particularly water resources, is a possibility when metal sulphide minerals from mining waste facilities are present. Some of the region’s mining waste deposits include is close to residential neighbourhoods, agricultural regions, and surface water, and is situated close to the town of Dipka. The short migration. An enhanced environmental risk is being brought on by the pathway between the sources and the sensitive receptors. Metalloids and heavy metals like Pb, Zn, Cd, Cu, and Ni, are the principal pollutants present in the area. In the water samples taken from the area, their quantities were found to be over acceptable levels of contamination. In addition, substantial levels of heavy metals were detected in the groundwater coming from the settlements located downstream of the facilities for handling mining waste. Drinking water for people and pets as well as other agricultural uses (such as irrigation) are both done with the help of this water. The aim of the paper is to identify and analyse the most polluted water supply sources in the area and to draw conclusions about the environmental risk due to mining waste facilities. The results show high concentrations of heavy metals downstream of the waste facilities, leading to an increased environmental risk.
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Gosar, Mateja, Robert Šajn, Miloš Miler, Ana Burger e Špela Bavec. "Overview of existing information on important closed (or in closing phase) and abandoned mining waste sites and related mines in Slovenia". Geologija 63, n. 2 (7 dicembre 2020): 221–50. http://dx.doi.org/10.5474/geologija.2020.018.
Testo completoAbstract (sommario):
The presented work provides a comprehensive inventory of data on closed (or in closing phase) and abandoned underground and surface mines and mining waste sites in Slovenia, collected within the framework of the Geological Survey of Slovenia (GeoZS) over the last two decades. Furthermore, a detailed overview of information on closed and abandoned mining waste sites in Slovenia is given. In order to establish the inventory, a definition of the work methodology, a comprehensive research of the archived and published literature, and the harmonisation and management of the collected data was carried out. Based on a selected methodology, the inventory contains information on 33 metal mines, 43 coal mines, 51 non-metallic mineral resource mines, 156 waste sites from metal mines and 18 waste sites from coal mines. The inventory is in the open access Google Earth file. It provides a basis for further research into the environmental impact of mining waste, which has been carried out since the EU Directive on the management of waste from extractive industries (Directive 2006/21/EC hereafter) was adopted into national law. In general, about 11,621,333 m3 of waste sites from metal mines and 76,188,000 m3 of waste sites from coal mines are covering about 678 hectares of Slovenian territory. More than half (64 %) of the waste from metal mines was produced in the Mežica lead and zinc mine, while the other two mines with a still significant share of produced waste were the Idrija mercury mine (18 %) and the Žirovski vrh uranium mine (15 %). Among the closed coal mines, the largest amount (46 %) of waste was generated by the coal mine Trbovlje-Hrastnik, while the other two coal mines with still significant share of waste produced were Kočevje (28 %) and Kanižarica (17 %).
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Ez-zaki, H., A. Diouri, A. Bouregba, F. Amor, S. Chhaiba, O. Sassi e Y. El Rhaffari. "Ecofriendly bricks elaborated from coal waste of Moroccan Jerrada Mining". MATEC Web of Conferences 149 (2018): 01043. http://dx.doi.org/10.1051/matecconf/201814901043.
Testo completoAbstract (sommario):
Solid waste generated during mining is one of the major environmental problems associated with this industrial activity. The best solution to overcome the environmental impact of this waste is to find recycling facilities in mass-produced products that can absorb the large quantities of these available byproducts. The present study shows the feasibility of using the coal waste of Moroccan Jerrada mining in the production of ecological brick. The first step consists of consecutive stages of crushing, grinding and heating at 650°C of the coal waste with a small amount of lime in order to promote the reactive products of elaborated binders. The second step of the process consists of mixing treated coal waste with a small amount of marble dust, sand, gravel, and water, then pressed and dried at room temperature to manufacture a laboratory ecofriendly bricks. The mechanical strength and thermal conductivity are investigated.
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Zhang, Xin Guo, Ning Jiang, Heng Wang e Yang Yang Li. "Study on Basic Experiment of Coal Waste Paste Filling Material". Applied Mechanics and Materials 174-177 (maggio 2012): 384–89. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.384.
Testo completoAbstract (sommario):
Based on present situation that coal mining under buildings, water bodies and railways, and solid wastes mainly including coal waste, fly ash in coal mine of our country, optimization proportioning of paste filling material and hydration reaction mechanism is systematicaly researched combining with project practice of paste filling in Daizhuang Coal Mine, Zibo Mining Group. The result shows that: Proportioning design P10 can be used as the optimal proportion results, the rate of cementing material is that the proportion: fly ash: coal waste is 1:4:6, quantity concentration is 74%; Coal waste paste XRD diffraction patterns of different instar shows that its hydration products at different instar stage are mainly gelation of CH, Aft and C-S-H; Relative content of each material in hydration products is different at different instar stage; With scanning electron microscope a certin ettringite is producted after coal waste paste hydrated 8h, and content of C-S-H gelation and CH gelation is increased gradually; Hydration process of portland cement is speed up and the strength of paste is enhanced.
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Szewczyk-Świątek, Anna, Anna Ostręga, Marek Cała e Pascal Beese-Vasbender. "Utilizing Circular Economy Policies to Maintain and Transform Mining Facilities: A Case Study of Brzeszcze, Poland". Resources 13, n. 8 (22 agosto 2024): 112. http://dx.doi.org/10.3390/resources13080112.
Testo completoAbstract (sommario):
How is the circular economy policy utilised to transform mining facilities? This paper analyses projects undertaken under increasing pressure for economic and energy transformation (transitioning away from coal), using the example of the municipality of Brzeszcze in Poland. These projects highlight the planned key spatial initiatives deemed feasible for implementation in the area, emphasising mining facilities and waste management (including waste from outgoing industries) that can break or speed transformation. The article aims to analyse solutions considered viable for implementation in mining towns, which can contribute to a better understanding of transformations in other monofunctional industrial centres in Europe. Data were collected using the research by design method. It is concluded that stakeholders perceive the development of peripheral mining areas as an action that can significantly impact the conduct and perception of activities related to the circular economy while also promoting a gradual transition away from coal mining. The article highlights the role of initiatives enabling the combination of transformations with a slowdown in the pace of mining activity cessation, considering the need for waste management, energy transformation, and the financial and energy stability of urban centres that have long relied on coal.
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Smoliński, Adam, Dmyto Malashkevych, Mykhailo Petlovanyi, Kanay Rysbekov, Vasyl Lozynskyi e Kateryna Sai. "Research into Impact of Leaving Waste Rocks in the Mined-Out Space on the Geomechanical State of the Rock Mass Surrounding the Longwall Face". Energies 15, n. 24 (15 dicembre 2022): 9522. http://dx.doi.org/10.3390/en15249522.
Testo completoAbstract (sommario):
Backfilling technology is not always used by mining enterprises, which is conditioned by technological and economic factors, such as the need for high mining rates and costs for the technological processes of transporting backfill materials from the daylight surface to the mined-out space. This concerns the underground mining of hard coal, which is a strategic energy resource, in the mines of Ukraine. This paper aims to study the effect of leaving the waste bottom rocks in the mined-out space of the longwall face without their drawing to the earth’s surface on the geomechanical state of the rocks surrounding the longwall face. The geomechanical assessment of the stress state of the rock mass surrounding the longwall face, when leaving the waste rocks from the seam bottom rocks in the mined-out space, is performed by the finite element method using the Ansys software package. A geomechanical model has been developed and substantiated, which adequately reflects the mining-geological conditions for seam mining within the extraction site, the actual structure and properties of the coal-bearing rock stratum, the parameters of the longwall face and the modified powered support for the processes of leaving the rocks in the mined-out space. The values and patterns have been determined of the decrease in the stress intensity concentrations in the coal-bearing roof mass in the frontal bearing pressure zone and destressing zone with an increase in the ratio of the rock pack thickness to the extracting seam thickness. The relative indicators of the load on the powered support section and the lowering of its roof have been determined by the ratio of the thickness of the rock pack formed in the mined-out space to the extracting seam thickness. The proposed mining method is of significant commercial and research interest for owners of coal mines developing thin coal seams because environmental costs for placing waste on the surface are reduced, and the energy potential of coal is increased due to the separation of waste rocks from coal in underground conditions. The need for a cycle of beneficiation of mined mass is eliminated and the geomechanical conditions of coal mining processes are improved.
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ZOCCHE, JAIRO J., PAULA ROHR, ADRIANI P. DAMIANI, DANIELA D. LEFFA, MIRIAM C. MARTINS, CAROLINE M. ZOCCHE, KARINA O. TEIXEIRA et al. "Elemental composition of vegetables cultivated over coal-mining waste". Anais da Academia Brasileira de Ciências 89, n. 3 suppl (23 ottobre 2017): 2383–98. http://dx.doi.org/10.1590/0001-3765201720170234.
Testo completo
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Haibin, Liu, e Liu Zhenling. "Recycling utilization patterns of coal mining waste in China". Resources, Conservation and Recycling 54, n. 12 (ottobre 2010): 1331–40. http://dx.doi.org/10.1016/j.resconrec.2010.05.005.
Testo completo
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Kutepov, Yuriy, Aleksandr Mironov, Maksim Sablin e Elena Borger. "Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal". E3S Web of Conferences 41 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20184101007.
Testo completoAbstract (sommario):
This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.
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Kowol, Daniel, e Haldun Kurama. "Recovery of Fine Coal Grains from Post-Mining Wastes with Use of Autogenous Suspending Bed Technology". Management Systems in Production Engineering 28, n. 4 (1 dicembre 2020): 220–27. http://dx.doi.org/10.2478/mspe-2020-0032.
Testo completoAbstract (sommario):
AbstractIn addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.
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Yan, Zhi Gang. "Study on Deformation of Tunnel with Underlying Coal Mining". Applied Mechanics and Materials 105-107 (settembre 2011): 1295–98. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1295.
Testo completoAbstract (sommario):
Coal mining can cause the strata distortion and surface subsidence. With infrastructure construction scale in our country enlargement, the case of approaching excavation caused by coal mining is increasing and more complicated. The calculation method of current regulations is too simple and don't conform to the present coal mining technology, so it will cause serious waste of resources. By using numerical simulation, this paper regards the influence of coal mining on the above tunnel as approaching excavation problem and studies the tunnel deformation law with three different coal mining mode. Based on the analysis and calculation, this paper proposes measures to ensure that the coal seam mining and tunnel's safety. The result indicates the more smaller the dip angle of coal block the more larger the displacement and the deformation range of tunnel. The most effective method for decrease deformation is the backfill method. If the conditions are permitted, backfill method is the preferred method and longwall caving method is last.
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GOLIK, V. I., e O. G. BURDZIEVA. "WASTE-FREE TAILINGS DISPOSAL TECHNOLOGY ENRICHMENT OF DONBASS". News of the Tula state university. Sciences of Earth 3, n. 1 (2023): 163–76. http://dx.doi.org/10.46689/2218-5194-2023-3-1-163-176.
Testo completoAbstract (sommario):
The prospects of waste-free utilization of coal enrichment tailings are considered. The concept of radical utilization of coal production waste with their inclusion in the natural cycle is detailed. The prospects of a new technology of metal leaching in high-speed mills with mechanochemical activation of processes are evaluated. The recommended technology provides an increase in the profitability of coal mining and radically solves environmental issues.
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Żukowska, Grażyna, Magdalena Myszura-Dymek, Szymon Roszkowski e Magdalena Olkiewicz. "Selected Properties of Soil-like Substrates Made from Mine Coal Waste and Their Effect on Plant Yields". Sustainability 15, n. 18 (6 settembre 2023): 13341. http://dx.doi.org/10.3390/su151813341.
Testo completoAbstract (sommario):
To reduce the environmental damage caused by coal waste landfills, it is necessary to look for rational methods for their management. One method for their development is the creation of soil-like substrates. This study aimed to assess the properties of soil-like substrates from coal mining waste, combined with a varied sample of sewage sludge and waste mineral wool. The properties of the substrates were evaluated in a pot experiment. The properties of the substrates and their yield potential were determined. Coal mining waste as a substrate, compared to anthropogenic soil, was characterized by a significantly higher sorption capacity; the content of alkaline cations and pH; significantly higher contents of organic carbon, nitrogen, and available forms of K and Mg; and a lower content of available P. The substrates enriched with sewage sludge showed a significant increase in content of organic carbon, nitrogen, and assimilable forms of P and Mg, as well as the optimization of sorption properties. Extending the composition of substrates with mineral wool resulted in further improvement of their properties. The yields of plants grown on coal mining waste were significantly lower than those of those grown on anthropogenic soil. Substrates with sewage sludge and mineral wool had a significantly higher yield potential.
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Bonczyk, M., e J. Rubin. "The application of coal mining waste to the production of construction ceramics: radiological and mechanical aspects". Materiales de Construcción 72, n. 348 (18 ottobre 2022): e300. http://dx.doi.org/10.3989/mc.2022.01822.
Testo completoAbstract (sommario):
The article presents the results of research on the physical and radiological properties of building ceramics made of mining waste. One method of using mining waste is to use it as aggregate in road construction. However, this alone is not enough to dispose of the entire amount of waste generated. Another promising method of using mining waste is the production of building ceramics (bricks). However, some properties (e.g. the content of natural radionuclides) of the waste may limit the possibility of such use. In the scope of this work, the properties of bricks made from mining waste - shale collected from dumps, were examined. It has been shown that the properties of bricks prepared in this way meet the criteria set out in various standards and legal acts and can be used in construction.
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Popovych, Vasyl, Andrii Voloshchyshyn, Dmytro Rudenko e Nataliia Popovych. "Geochemical properties of water under the waste heaps in Chervonohrad mining region". E3S Web of Conferences 123 (2019): 01035. http://dx.doi.org/10.1051/e3sconf/201912301035.
Testo completoAbstract (sommario):
The geochemical properties of water under the waste heaps within the Chervonohrad mining region have been studied. The environmental remediation around the technogenic reservoirs of rock heaps using the bioplateau systems is proposed. In 2017, samples were taken from reservoirs of technogenic origin located at the foot of rock heaps of such coal mines as “Mezhyrichanska”, “Velykomostivska”, “Stepova”, “Zarichna”, “Lisova” and “Chervonohradska”. According to the analysis of the studied parameters, it has been determined that water under the Mezhyrichanska Mine waste heaps is the most polluted. The most dangerous landscape-transforming factor of water under the waste heaps is the transfer of polluting substances into the soil, surface and subterranean waters. Through the use of the Pearson coefficients of correlation, the ratios between pollution patameters have been obtained. The determined correlation coefficients are high, positive (r = 0.78 – 0.99) and evidence of the toxic components spread in water under the waste heaps throughout the entire coal mining region. The obtained geochemical data on water under the waste heaps of mines in the Chervonohrad mining region are important in terms of the environmental impact assessment of mining activity on the human body and the biosphere components – the hydrosphere, the phytogenic field. It is necessary to establish environmental monitoring systems and to develop measures for the environmentally safe decommissioning the waste heaps of coal mines.
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Oliveira, João Pedro, Luís Araújo Santos, Joana Ribeiro, Paulo Coelho e António M. G. Pedro. "Influence of Environmental Conditions on the Behaviour of Tailings from Tungsten Mining for Sustainable Geotechnical Applications and Storage". Sustainability 16, n. 24 (14 dicembre 2024): 10987. https://doi.org/10.3390/su162410987.
Testo completoAbstract (sommario):
Modern societies require increasingly large amounts of minerals and metals for their development. Therefore, huge amounts of waste must be stored in safe and cost-effective massive tailing storage facilities that would benefit from using tailings in sustainable geotechnical applications within the context of the circular economy. However, to consider tailings as assets, the long-term behaviour of these unconventional geomaterials under realistic environmental conditions must be assessed. This paper focuses on the effects of the environmental conditions on the behaviour of tailings from tungsten mining by experimentally determining their major physical and mechanical properties for three different conditions: twenty-months-aged undisturbed samples and reconstituted samples, with the latter being fresh and three months. The results confirm that twenty-months-aged undisturbed and fresh reconstituted tailings have significantly different mechanical behaviour, while three-months-aged reconstituted samples show an in-between behaviour as if the material regenerates and improved its behaviour with time due to physical and chemical processes. These ageing processes are experimentally confirmed by measuring the electrical conductivity in the samples. The results confirm that optimising the design of tailing storage facilities and using these geomaterials in sustainable geotechnical applications must consider the existing environmental conditions and the potential tailings’ mechanical changes due to ageing.