Log in

Relevant bibliographies by topics / Waste of alumina production / Journal articles

Journal articles on the topic 'Waste of alumina production'

To see the other types of publications on this topic, follow the link: Waste of alumina production.

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Waste of alumina production.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Khlystov, A. I., S. V. Sokolova, M. N. Baranova, D. I. Vasilieva, and Yu A. Kholopov. "Prospects for Using Alumina-Containing Industrial Waste in Cement Production." Ecology and Industry of Russia 25, no. 7 (July 20, 2021): 13–19. http://dx.doi.org/10.18412/1816-0395-2021-7-13-19.

Full text

Abstract:

Local industrial waste from the Samara region (aluminochrome waste of petrochemicals, aluminium sludge of non-ferrous metallurgy) has been studied for use in the production of fire-resistant lining materials with enhanced operational characteristics. The composition and properties of industrial wastes formed at the Samara Metallurgical Plant and their application for obtaining active liquid-steel binder compositions have been studied. The dependence of these compositions refractoriness on the type of hardener and the amount of additive has been analyzed.

APA, Harvard, Vancouver, ISO, and other styles

2

Vukšić, Milan, Irena Žmak, Lidija Ćurković, and Danko Ćorić. "Effect of Additives on Stability of Alumina—Waste Alumina Suspension for Slip Casting: Optimization Using Box-Behnken Design." Materials 12, no. 11 (May 29, 2019): 1738. http://dx.doi.org/10.3390/ma12111738.

Full text

Abstract:

The green machining of alumina (Al2O3) green bodies generates a certain amount of waste alumina powder. Waste alumina ceramic powder should be disposed of as non-hazardous waste in a legally compliant manner. The influence of additives on the stability of 70 wt.% (≈40 vol.%) alumina—waste alumina water-based suspension was investigated in the presented research. A Box-Behnken three-factor response surface design was used for the preparation of stable highly-concentrated suspensions with the addition of three additives. The optimal amount of each additive was selected according to the obtained results of minimal apparent viscosity: 0.05 wt.% Tiron as dispersant, 0.1 wt.% poly (vinyl alcohol) as binder and 0.2 wt.% magnesium aluminate spinel as abnormal grain growth inhibitor. The analysis of variance was used to identify the contribution of each additive. The zeta potential and sedimentations tests were performed to confirm the suspension stability measurements at different pH values. Alumina particles were optimally dispersed at pH values between 8 and 11. According to the results, the investigated composition of 20 wt.% waste alumina powder (weight content, dry alumina powder), with the addition of optimal amounts of additives, shows a possible application in the production of ceramics by slip casting.

APA, Harvard, Vancouver, ISO, and other styles

3

Pavlova, Irina, Anna Getman, and Elena Farafontova. "The Way of Utilization of Fused Corundum Dust Waste for the High-Alumina Chamotte Production." Solid State Phenomena 316 (April 2021): 100–104. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.100.

Full text

Abstract:

High-alumina chamotte with an Al2O3 content of more than 62% is a desirable raw material to produce high-alumina refractories. The production of high-alumina aggregate (chamotte) is carried out in various ways, using plastic or semi-dry technology for briquetting from commercial alumina and refractory clay. When grinding fused corundum, the dust containing 93–95% Al2O3 is formed; it is currently a substandard material. It is of interest to involve this waste product in the production of high-alumina chamotte. The developed technology allows obtaining the desirable material and utilizing production waste. In this project the briquetting parameters to produce high-alumina chamotte using corundum waste and refractory enriched kaolin were determined.

APA, Harvard, Vancouver, ISO, and other styles

4

Ribeiro, Catarina, Lucinda Gonçalves, and Francisco Delmas. "Highly Reactive Alumina Production from Spent Baths." Materials Science Forum 514-516 (May 2006): 1716–21. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1716.

Full text

Abstract:

Hydrated alumina Al2O3.3H2O was produced from spent alkaline baths resulting from aluminium transformation industry. Batch and continue laboratory and pilot tests were performed in order to assess technical viability of producing reactive alumina directly from the baths by a precipitation/crystallization process and at the same time of recovering and recycling the associated sodium hydroxide to the extrusion process. The influence of three parameters: time, seed quantity and dilution were evaluated using a statistical method. It was found that time and dilution are the factors which have more influence on aluminium precipitation yield, allowing to reach values greater than 45%. The hydrated aluminas obtained were characterized by granulometric analysis, scanning electron microscopy and x-ray diffraction. Therefore, apart from minimizing the environmental impact of the aluminium transformation industry by reducing a waste quantity, it is obtained a marketable sub-product and recovered a raw material (NaOH), which can be recycled within the aluminium transformation process.

APA, Harvard, Vancouver, ISO, and other styles

5

Chawakitchareon, Petchporn, and Plengprapkun Kingthong. "Utilization of Alumina Waste and Silica Waste for Geopolymer Production." Engineering Journal 20, no. 4 (August 1, 2016): 51–57. http://dx.doi.org/10.4186/ej.2016.20.4.51.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Das, B. R., B. Dash, B. C. Tripathy, I. N. Bhattacharya, and S. C. Das. "Production of η-alumina from waste aluminium dross." Minerals Engineering 20, no. 3 (March 2007): 252–58. http://dx.doi.org/10.1016/j.mineng.2006.09.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Yadav, Virendra Kumar, and Madhusudan Hiraman Fulekar. "Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste." Ceramics 3, no. 3 (September 22, 2020): 384–420. http://dx.doi.org/10.3390/ceramics3030034.

Full text

Abstract:

Fly ash or coal fly ash causes major global pollution in the form of solid waste and is classified as a “hazardous waste”, which is a by-product of thermal power plants produced during electricity production. Si, Al, Fe Ca, and Mg alone form more than 85% of the chemical compounds and glasses of most fly ashes. Fly ash has a chemical composition of 70–90%, as well as glasses of ferrous, alumina, silica, and CaO. Therefore, fly ash could act as a reliable and alternative source for ferrous, alumina, and silica. The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. Alumina extraction is possible using both alkali- and acid-based methods, while silica is extracted by strong alkali, such as NaOH. Chemical extraction has a higher yield than the biological approaches, but the bio-based approaches are more environmentally friendly. Fly ash can also be used for the synthesis of zeolites by NaOH treatment of variable types, as fly ash is rich in alumino-silicates. The present review work deals with the recent advances in the field of the recovery and synthesis of ferrous, alumina, and silica micro and nanoparticles from fly ash.

APA, Harvard, Vancouver, ISO, and other styles

8

., S. T. El Sheltawy, N. F. Abdel Salam ., and F. I. Barakat . "Acidic Reaction of Waste Aluminum Foil for Alumina Production." Volume 5,Issue 1, 2019 5, no. 1 (April 3, 2019): 325–27. http://dx.doi.org/10.30799/jespr.163.19050104.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Makhotkina, E. S., O. S. Ponomareva, and L. G. Kolyada. "Resource-Saving Technology of Recycling of Wastes of Secondary Aluminium Production in a Blast Furnace in the Process of Aluminous Slag Smelting." Solid State Phenomena 265 (September 2017): 1081–85. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1081.

Full text

Abstract:

The paper considers the theoretical and practical aspects of recycling of secondary aluminium production wastes by adding them to the burden mix in the process of aluminous slag production (from bauxites) in the blast-furnace smelting operation. The comparative analysis of bauxite chemical composition and the secondary aluminium production waste was carried out and the feasibility of using secondary aluminium production waste as a raw material for blast-furnace smelting was studied. A mathematical model was presented to obtain aluminous slag by blast-furnace smelting of bauxites with their partial substitution with the secondary aluminium production waste; this model makes it possible to calculate the rational mixture of burden materials when aluminous slag is produced in a blast furnace taking into account chemical composition of the materials used and the required content of oxides of aluminium, calcium and silicon in the final slag. The high-alumina slag formed when the wastes of secondary aluminium production are used in burden materials is characterized by low gas content during slag tapping (in spite of the elevated temperature) and by high flowability. The laboratory tests of binding properties of the high-alumina slag obtained in a blast furnace using wastes of secondary aluminium production, which were carried out by the plant laboratory, showed that the cements produced from this slag have satisfactory strength characteristics, although their setting time is somewhat longer. Recycling of slag dumps of aluminium production will make it possible to obtain new sources of raw materials, enhance the technology of handling and transportation of materials from man-made mineral formations to recycling plants without increasing the environmental load.

APA, Harvard, Vancouver, ISO, and other styles

10

Kadyrova, Z. R., R. Kh Pirmatov, and A. A. Eminov. "Perspective raw materials of Uzbekistan for the production of refractory materials." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 7 (October 29, 2019): 8–11. http://dx.doi.org/10.17073/1683-4518-2019-7-8-11.

Full text

Abstract:

The results of studies of promising raw material resources of Uzbekistan (enriched kaolins, bauxite-like rock, highalumina waste from the gas processing industry) to obtain high-alumina aggregates are presented. It is established that these raw materials in terms of their physico-chemical indicators meet the requirements for aluminosilicate and high-alumina materials used in metallurgical units. Ref. 13. Tab. 3.

APA, Harvard, Vancouver, ISO, and other styles

11

Zolotovskii, B. P., R. A. Buyanov, G. A. Bukhtiyarova, V. V. Demin, and A. M. Tsybulevskii. "Low-waste production of alumina catalysts for gas sulfur recovery." Reaction Kinetics & Catalysis Letters 55, no. 2 (June 1995): 523–35. http://dx.doi.org/10.1007/bf02073089.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Fomina, E. Yu, and V. V. Vlasova. "Development of Alumina Production Technology by sintering of TPP Waste." IOP Conference Series: Earth and Environmental Science 408 (January 14, 2020): 012070. http://dx.doi.org/10.1088/1755-1315/408/1/012070.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

SARIDEDE, M. N., Z. ÇİZMECİOĞLU, and S. DEĞERLİ. "THE PRODUCTION OF ACTIVATED ALUMINA FROM ALUMINUM HYDROXIDE BASED WASTE." Canadian Metallurgical Quarterly 44, no. 1 (January 2005): 131–36. http://dx.doi.org/10.1179/cmq.2005.44.1.131.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Kuznetsov, Vladimir, and Igor Suprun. "The Assessment of Alumina Production Waste Impact on Natural Water." Journal of Ecological Engineering 19, no. 2 (March 1, 2018): 154–58. http://dx.doi.org/10.12911/22998993/82267.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Hagrass, A., S. Ibrahim, F. El-Hosiny, S. Youssef, and M. Moharam. "Utilization of Alumina Industrial Waste in Production of Blended Cement." Bulletin Tabbin Institute for Metallurgical Studies (TIMS) 107, no. 1 (February 1, 2018): 23–37. http://dx.doi.org/10.21608/tims.2018.198508.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Sano, Saburo, Takeshi Fukuda, and Yasuo Shibasaki. "Development of Platy Alumina and its Application." Advances in Science and Technology 45 (October 2006): 2204–11. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2204.

Full text

Abstract:

It has been required to change the industrial production processes to low waste emission ones from a view point of environmental issue. In the production of aluminum building materials, large amount of sludge is emitted as industrial waste. If we can change the waste to valuable products, we can respond to the request. Synthesis technology of kaolinitic particles from various starting raw materials had been established at National Industrial Research Institute of Nagoya (NIRIN, present: AIST Chubu). Hydro-thermal treatment is applied to the technology and obtained particles show various shapes such as plate, shell and so on. Collaborative research work between NIRIN and YKK corporation to develop high performance alumina powder form aluminum sludge, a by-product from surface treatment process in the manufacturing of aluminum building materials, had been done by using the fruits from the research project on kaolinite synthesis at NIRIN. As the result, high performance platy alumina powder was developed by using hydro-thermal synthesis technology.

APA, Harvard, Vancouver, ISO, and other styles

17

Puspa Asri, Nyoman, and Diah Agustina Puspita Sari. "Pre-Treatment of Waste Frying Oils for Biodiesel Production." Modern Applied Science 9, no. 7 (July 1, 2015): 99. http://dx.doi.org/10.5539/mas.v9n7p99.

Full text

Abstract:

Synthesis of biodiesel is a strategic step in overcoming energy scarcity and the environmental degradationcaused by the continuous use of the petroleum based energy. Biodiesel as an alternative fuel for diesel engine isproduced from renewable resources such as vegetable oils and animal fats. The main obstacle in the biodieselproduction is the high price of the raw materials, resulting in the price of biodiesel is not competitive comparedto the petroleum diesel. Therefore, the use of waste frying oils (WFO) is one way to reduce the cost of biodieselproduction, because of its availability and low price. In the present work, WFO from California Fried chicken(CFC) restaurants in Surabaya were used as feed stock for the biodiesel production. The experiments wereconducted using three steps of processes: pre-treatment of WFO, preparation of alumina based compositecatalyst CaO/KI/γ-Al2O3 and transesterification of treated WFO. WFO was treated by several types and variousamounts of activated adsobents. The treated WFO was transesterified in three neck glass batch reactor withrefluxed methanol using CaO/KI/γ-Al2O3. The results reveal that the best method for treating WFO is using 7.5%(wt. % to WFO) of coconut coir. Alumina based composite catalyst CaO/KI/γ-Al2O3 was very promising fortransesterification of WFO into biodiesel. The yield of biodiesel was 83% and obtained at 65ºC, 5 h of reactiontime, 1:18 of molar ratio WFO to methanol and 6% amount of catalyst.

APA, Harvard, Vancouver, ISO, and other styles

18

Sithole, T., K. Jalama, and R. Meijboom. "Biodiesel Production from Waste Vegetable Oils over MgO/Al2O3 Catalyst." Applied Mechanics and Materials 492 (January 2014): 350–55. http://dx.doi.org/10.4028/www.scientific.net/amm.492.350.

Full text

Abstract:

MgO/Al2O3 catalysts with 10 and 20 wt.% MgO loadings have been prepared by incipient wetness impregnation method. A low-surface area alumina with small pore sizes was used as catalyst support to stabilise most of the MgO particles on the external surface area of the support. The prepared catalysts were subsequently tested in the conversion of a waste vegetable oil to biodiesel. The waste vegetable oil conversion was found to increase with the increase in reaction temperature, reaction time and MgO loading in the catalyst.

APA, Harvard, Vancouver, ISO, and other styles

19

Fedoročková, Alena, Gabriel Sučik, Beatrice Plešingerová, Ľuboš Popovič, Mária Kovaľaková, and Martin Vavra. "Simplified waste-free process for synthesis of nanoporous compact alumina under technologically advantageous conditions." RSC Advances 10, no. 54 (2020): 32423–35. http://dx.doi.org/10.1039/d0ra06544g.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Miqueleiz, L., F. Ramirez, J. E. Oti, A. Seco, J. M. Kinuthia, I. Oreja, and P. Urmeneta. "Alumina filler waste as clay replacement material for unfired brick production." Engineering Geology 163 (August 2013): 68–74. http://dx.doi.org/10.1016/j.enggeo.2013.05.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Tyurina, L. E. "The balance of nitrogen, calcium and phosphorus in lactating cows." Mongolian Journal of Agricultural Sciences 22, no. 03 (May 9, 2018): 29–32. http://dx.doi.org/10.5564/mjas.v22i03.946.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Koren'kova, S. F., and T. V. Sheina. "Alumina-containing wastes in ceramic production." Glass and Ceramics 49, no. 8 (August 1992): 392–94. http://dx.doi.org/10.1007/bf00677870.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Cristina de Resende, Eliane, Iara do Rosário Guimarães Carvalho, Marcel Schlaf, and Mário César Guerreiro. "Red Mud waste from the Bayer process as a catalyst for the desulfurization of hydrocarbon fuels." RSC Adv. 4, no. 88 (2014): 47287–96. http://dx.doi.org/10.1039/c4ra07635d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

He, Ao Ping, Zhi Liu Hu, De Guang Cao, Jian Min Zeng, Bo Lin Wu, and Lin Jiang Wang. "Comprehensive Utilization of Red Mud Remaining in Alumina Production." Advanced Materials Research 881-883 (January 2014): 663–66. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.663.

Full text

Abstract:

Red mud is a solid waste which is generated in the process of alumina production and is of highly alkaline. Red mud has very complex compositions, but contains a variety of rare and valuable metals. In addition, its high alkalinity is a severe pollution to water, land, air and environment, which has been one of the main factors to affect the sustainable development of aluminum industry. The characterization of red mud, the extraction of valuable metals from red mud, the utilization of red mud in construction materials, environmental restoration materials and other fields are introduced in this paper.

APA, Harvard, Vancouver, ISO, and other styles

25

Nikanorov, A. V. "Improvement of the Technology of Fluorine Recovery from Solid Waste of Primary Aluminum Production." Materials Science Forum 1052 (February 3, 2022): 493–97. http://dx.doi.org/10.4028/p-7p174d.

Full text

Abstract:

The possibility of using modern high-tech flotation equipment at RUSAL Bratsk PJSCis considered, which allows to significantly reduce discharges of extremely hazardous waste of fluorine, sodium, and aluminum to the sludge fields, and to initiate recycling of waste from the sludge fields. The results of operation are presented for a coal foam column flotation system at PJSC RUSAL Bratsk. An innovative technique has been developed allowing to recycle lining waste from aluminum electrolysis pots. The recycling of the waste lining coming from aluminum electrolysis pots is a completely closed waste-free cycle, which provides alumina and cryolite — products that can be used in the aluminum electrolysis, as well as allows using all the secondary solid waste in the satellite cement production.

APA, Harvard, Vancouver, ISO, and other styles

26

Aung, Htet Ye, Alexander Boyarintsev, Sergey Stepanov, and Andrei Shoustikov. "Current key options for management of industrial alkaline waste of alumina production (red mud)." E3S Web of Conferences 284 (2021): 01003. http://dx.doi.org/10.1051/e3sconf/202128401003.

Full text

Abstract:

Due to the ever-increasing demand of the world economy for aluminum, its alloys and compounds, the production of this metal is increasing annually throughout the world. This leads to an increase in the industrial production of alumina, which is obtained from bauxite ore in the Bayer process. After recovering the bulk of the aluminum from the bauxite ore, there remains a residue which is highly alkaline toxic waste, which is also called bauxite residues (tailings) or red mud (RM). About 140-150 million tons of RM are produced annually and almost 4 billion tons have already been accumulated. At the moment, the problem of RM recycling and the development of effective and cost-effective approaches to their reprocessing is extremely urgent. Reducing RM affects economic, environmental, social areas and is a prerequisite for the sustainable development of nature and society. Despite active scientific research and efforts to develop and optimize various methods for RM recycling and reprocessing, the problem of an annual increase in their volumes around the world remains unresolved. Recently, promising and efficient processes have been proposed that allows for the complex reprocessing of RM with the extraction of a number of valuable liquid products that may be in demand in various fields of industry. This allows to focus on large-scale disposal of RM and can be a solution to the problem of handling these industrial wastes. The article considers the main current trends in the field of management of various types of RM with a focus on complex reprocessing and zero waste concepts.

APA, Harvard, Vancouver, ISO, and other styles

27

Косогіна, І. В. "PROSPECTS FOR THE USE OF WASTE ALUMINA PRODUCTION IN WATER TREATMENT TECHNOLOGY." WATER AND WATER PURIFICATION TECHNOLOGIES. SCIENTIFIC AND TECHNICAL NEWS 15, no. 2 (November 1, 2014): 43–49. http://dx.doi.org/10.20535/2218-93001522014137596.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Zhong, Lianyun, Bolin Wu, Lianmeng Zhang, and Guifang Zhang. "Preparation of high performance green alumina ceramic balls by roller production waste." Journal of Wuhan University of Technology-Mater. Sci. Ed. 23, no. 1 (February 2008): 134–38. http://dx.doi.org/10.1007/s11595-006-1134-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Liu, Xiao Ting, Bao Dong Wang, Yong Feng Xiao, Xiao Huan Wang, Li Jun Zhao, Geng Zhi Yu, and Qi Sun. "Alumina Extraction from Alumina Rich Fly Ash Generated from Inner-Mongolia Chinese Coal." Advanced Materials Research 1065-1069 (December 2014): 1725–31. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1725.

Full text

Abstract:

Generated during the combustion of coal for electricity production, fly ash is a solid waste and causes great ecomomic burden and serious environmental pollution. On the other hand, it is a good resource for the preparation of industrial products. Especially, alumina rich fly ash from Inner-Mongolia Guohua Junggar Power Plant typically contains 45-55% alumina, 30-40% silica, and 5-10% other metallic oxides, it is a perfect resource for alumina extraction. In order to improve the utilization value of alumina rich fly ash and lessen environmental strain, a novel approach for alumina extraction from alumina rich fly ash was proposed. The proposed process includes a pre-desilication process, soda lime sintering process, dissolving process, carbonation process and calcination process. The technological conditions for alumina extraction from Junggar alumina rich fly ash were optimized by means of orthogonal experment design. The extraction rate of alumina was 96%. Value-added products, such as electrolytic grade alumina and white carbon black, were produced at the same time.

APA, Harvard, Vancouver, ISO, and other styles

30

Aryngazin, Kapar Sh, Alexey V. Bogomolov, and Askar K. Tleulessov. "Innovational Construction Materials of LLP “EcostroyNII-PV” Production." Defect and Diffusion Forum 410 (August 17, 2021): 806–11. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.806.

Full text

Abstract:

The article discusses the experience of recycling industrial waste from the electric power industry and metallurgy. Based on the experience of Ecostroy NII-PV LLP. The proposed technology for manufacturing building products from ash and slag waste provides innovative compositions of raw mixtures. What provides an increase in operational characteristics and labor productivity in construction. The applied technology, in comparison with the existing analogues, provides for the use of local waste (ash and slag waste from the combustion of Ekibastuz coal, bauxite sludge from the Pavlodar aluminum plant, steel-making slags), differing in chemical and granulometric composition. as well as binding properties from other analogs and prototypes. In the manufacture of building products introduced mixture, including, wt %: slag Portland cement - 14.32-17.00; sand - 18.74-25.52, crushed stone - 46.50-49.71, sludge from alumina production obtained during the recycling of bauxite from Kazakhstan - 5-7; self-disintegrating steelmaking slag - 5-7; ash and slag waste from thermal power plants from burning Ekibastuz coals - 5-7. According to the test results, the average tensile strength of building products (paving slabs, curbs, hollow bricks) is 3.2 - 3.8 MPa (strength class V2.5).

APA, Harvard, Vancouver, ISO, and other styles

31

Shubov, L. Ya, I. G. Doronkina, O. N. Borisova, L. M. Tyger, and T. R. Lyubetskaya. "Analytical evaluation and systematization of technologies for extraction of rare metals from production waste." E3S Web of Conferences 311 (2021): 09005. http://dx.doi.org/10.1051/e3sconf/202131109005.

Full text

Abstract:

The article is a message containing systematized information on resource-saving technologies as the basic for involving metal-containing secondary raw materials in the economic turnover. The set of independent technologies arranged in a certain sequence that solve the problems of resource saving allows us to compare the specific features and effectiveness of the use of each of them, the details and features of the processes. It is shown that the following can be the main sources of rare metals and REE: phosphogypsum (REE, Sr); ash and slag waste from TPPs, ash and slag waste (REE, Ti, Sc); metallurgical slags (Ge, Be, Se, Te, V); sulfuric acid dust (Se, Te); alumina production waste - red mud (Sc, REE); liquid waste from sulphate production of titanium dioxide (Sc, Ti); refinery dust bins (Se, Te); wastes from production of permanent magnets (Nd, Sm). It is noted that the technology uses beneficiation methods, acid leaching and ion-exchange concentration, biotechnology, electrolysis, heat treatment, a combination of different methods. To assess the quality of man-made raw materials and their suitability for complex processing and utilization, the article uses the methodology of analytical research of a set of patented technological solutions (technological samples were taken from real man-made deposits).

APA, Harvard, Vancouver, ISO, and other styles

32

Raducanu, Cristian Eugen, Adina Ionuta Gavrila, Tanase Dobre, and Petre Chipurici. "Study on Alumina Supported Heterogeneous Catalysts for Biodiesel Production." Revista de Chimie 69, no. 8 (September 15, 2018): 2138–43. http://dx.doi.org/10.37358/rc.18.8.6488.

Full text

Abstract:

In this work four heterogeneous catalysts were studied first by preparing a gama-alumina catalytic support then by impregnating with acidic and base compounds to gain certain properties needed to catalyze vegetable oils conversion to biodiesel. The resulted new catalytic properties allowed us to simultaneously conduct esterification and transesterification reaction in a single step when waste cooking oils with a high free fatty acid content were converted to biodiesel. The prepared catalysts were thermally and chemically stable and exhibited good catalytic activity when tested in (trans)esterification reactions to yield biodiesel. The effects of catalyst loading, methanol/oil molar ratio and reaction time on biodiesel yield along with catalyst reusability were investigated. The highest biodiesel yield reached was 88.10% at 65oC reaction temperature, 15:1 methanol/oil molar ratio, 5% catalyst loading and 4 h reaction time.

APA, Harvard, Vancouver, ISO, and other styles

33

Fu, Ruru, Zhuangzhang He, Shikai Qin, Qingze Jiao, Caihong Feng, Hansheng Li, and Yun Zhao. "Light olefin production using the mixture of HZSM-5/MCM-41 and γ-Al2O3 as catalysts for catalytic pyrolysis of waste tires." Chemical Industry and Chemical Engineering Quarterly, no. 00 (2020): 25. http://dx.doi.org/10.2298/ciceq200302025f.

Full text

Abstract:

In this paper, micro-mesoporous HZSM-5/MCM-41 zeolites were prepared by a two-step hydrothermal method using commercial HZSM-5 with two different silica/alumina ratios (38 and 50) as starting materials. The structures, morphologies and acidity of as-prepared zeolites were analyzed using XRD, FT-IR, SEM, N2-adsorption/desorption and NH3-TPD. The HZSM-5/MCM-41 zeolites combined the acidity of microporous HZSM-5 with the pore advantages of mesoporous MCM-41. Mesopores and microspores of 3.34 and 0.95 nm in diameter were found to be present in HZSM-5/MCM-41 zeolites. When they were used to catalyze the pyrolysis of waste tires, the selectivity of light olefins for HZSM-5/MCM-41 prepared using HZSM-5 with the silica/alumina ratio of 50 as starting materials was 21.42%, higher than 18.43% of HZSM-5/MCM-41synthesized using HZSM-5 with the silica/alumina ratio of 38. In order to further overcome the pore size constraints and mass transfer limitations of HZSM-5/MCM-41 zeolites for catalyzing pyrolysis of waste tires, macroporous ?-Al2O3 were mixed with HZSM-5/MCM-41 and used as catalysts. The selectivity to light olefins for the mixture of ?-Al2O3 and HZSM-5/MCM-41 prepared using HZSM-5 with the silica/alumina ratio of 50 as starting materials was 33.65%, which was obviously enhanced by the introduction of ?-Al2O3.

APA, Harvard, Vancouver, ISO, and other styles

34

Valeev, Dmitry, Andrei Shoppert, Alexandra Mikhailova, and Alex Kondratiev. "Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina." Metals 10, no. 5 (April 29, 2020): 585. http://dx.doi.org/10.3390/met10050585.

Full text

Abstract:

Sandy grade alumina is a valuable intermediate material that is mainly produced by the Bayer process and used for manufacturing primary metallic aluminum. Coal fly ash is generated in coal-fired power plants as a by-product of coal combustion that consists of submicron ash particles and is considered to be a potentially hazardous technogenic waste. The present paper demonstrates that the Al-chloride solution obtained by leaching coal fly ash can be further processed to obtain sandy grade alumina, which is essentially suitable for metallic aluminum production. The novel process developed in the present study involves the production of amorphous alumina via the calcination of aluminium chloride hexahydrate obtained by salting-out from acid Al-Cl liquor. Following this, alkaline treatment with further Al2O3 dissolution and recrystallization as Al(OH)3 particles is applied, and a final calcination step is employed to obtain sandy grade alumina with minimum impurities. The process does not require high-pressure equipment and reutilizes the alkaline liquor and gibbsite particles from the Bayer process, which allows the sandy grade alumina production costs to be to significantly reduced. The present article also discusses the main technological parameters of the acid treatment and the amounts of major impurities in the sandy grade alumina obtained by the different (acid and acid-alkali) methods.

APA, Harvard, Vancouver, ISO, and other styles

35

Nevřivová, Lenka, and David Zemánek. "Analysis of Alkali Oxides Influence on the Microstructure of Refractory Grog." Solid State Phenomena 325 (October 11, 2021): 188–93. http://dx.doi.org/10.4028/www.scientific.net/ssp.325.188.

Full text

Abstract:

The development and subsequent production of these special kind of grog from raw materials available in the Czech Republic is one of the possibilities how to reduce income costs for the production of refractory materials with specific properties. The experimental work is focused on verifying the possibility of producing grog with increased alumina content from available raw materials. The raw materials are kaolins and claystones. To achieve a higher content of alumina in the grog, waste mullite dust is used. In order to improve the physical and mechanical properties of the grog, modifiers are used. Selected modifiers are expected to affect positively on the resulting density while maintaining the heat properties.

APA, Harvard, Vancouver, ISO, and other styles

36

Кирій, Світлана Олександрівна, Ірина Володимирівна Косогіна, Ігор Михайлович Астрелін, and Ольга Юріївна Кирієнко. "The efficiency of coagulation treatment wastewater by reagent obtained from waste alumina production." Research Bulletin of the National Technical University of Ukraine "Kyiv Polytechnic Institute", no. 6 (December 23, 2015): 95–101. http://dx.doi.org/10.20535/1810-0546.2015.6.51173.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Liu, Xiaotong, Su He, Zhenan Han, and Chunfei Wu. "Investigation of spherical alumina supported catalyst for carbon nanotubes production from waste polyethylene." Process Safety and Environmental Protection 146 (February 2021): 201–7. http://dx.doi.org/10.1016/j.psep.2020.08.027.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Ulfah, M., Firdaus, S. Octavia, H. Suherman, and Subagjo. "Biodiesel Production Through Waste Cooking Oil (WCO) Esterification Using Sulfated Alumina as Catalyst." IOP Conference Series: Materials Science and Engineering 543 (June 13, 2019): 012007. http://dx.doi.org/10.1088/1757-899x/543/1/012007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Jantasee, Sasiradee, Natacha Phetyim, Komm Petchinthorn, Tunyahpat Thanupongmanee, and Nuntiporn Sripirom. "Pyrolysis oil production from polypropylene plastic waste using molybdenum modified alumina-silica catalysts." E3S Web of Conferences 122 (2019): 01005. http://dx.doi.org/10.1051/e3sconf/201912201005.

Full text

Abstract:

The production of pyrolysis oil from polypropylene plastic waste was examined over molybdenum modified alumina-silica catalysts (Mo/Al-Si). The reactions were carried out with 1 L of batch reactor under atmospheric pressure at 430 °C. The pyrolysis oil yield was in the order, 10% Mo/Al-Si > 5% Mo/Al-Si > the absence of catalyst. The 10% Mo/Al-Si was highest activity due to the stronger acidity facilitating the pyrolysis reaction. It accelerated the reaction to produce the pyrolysis oil at lower temperature. Comparison of the pyrolysis oil properties to the standards of the diesel fuel from Thai Department of Energy Business shows that the color and the distillation were within standards. Moreover, the results reveal that the kind of raw material affected the product yield of pyrolysis process.

APA, Harvard, Vancouver, ISO, and other styles

40

Lee, Sangwon, Taesup Moon, Hyosoo Kim, Myungwon Choi, Deasun Lee, Sangtae Park, and Changwon Kim. "Production of Alternative Coagulant Using Waste Activated Alumina and Evaluation of Coagulation Activity." Journal of Korean Society of Environmental Engineers 36, no. 7 (July 31, 2014): 514–20. http://dx.doi.org/10.4491/ksee.2014.36.7.514.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Lebedev, A. B., V. A. Utkov, and V. Yu Bazhin. "Use of Alumina Production Waste Red Mud During Molten Sulfur-Containing Slag Granulation." Metallurgist 63, no. 7-8 (November 2019): 727–32. http://dx.doi.org/10.1007/s11015-019-00882-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Georgescu, Vasile, Mihaela Bombos, Catalina Calin, and Dorin Bombos. "Physico - Chemical and Morphologic Structural Characterization of the Red Mud Obtained in the Romanian Alumina Plant." Revista de Chimie 70, no. 2 (March 15, 2019): 565–70. http://dx.doi.org/10.37358/rc.19.2.6956.

Full text

Abstract:

The red mud is the main insoluble waste product from the manufacture of alumina by the Bayer hydrometallurgical process. Due to the accumulation in large quantities (0.8-1.2 metric tons waste / 1 metric ton of alumina) with a relatively high content of residual alkali and small granulation, it has been subject to many research activities, especially related to the techniques of neutralizing and enhancing its reuse under the form of various subproducts. This paper presents the results of the work undertaken by the collective of authors to evaluate the physico-chemical and morphological structure of red mud resulting from alumina production. The physico-chemical and morphological structure were analyzed using complex analytical methods (ICP-AES/OES, DCP, AAS, EDS-EDAX, SEM, DTAC, XRF, XRD, optical microscopy). The aim was to identify potentially active compounds for various environmental applications. To estimate the average chemical composition, by element, we used dispersion analysis, through the Gauss normal distribution method.

APA, Harvard, Vancouver, ISO, and other styles

43

Miller, Maurice O., and Dionne A. Miller. "The Technological Enhancement of Normally Occurring Radioactive Materials in Red Mud due to the Production of Alumina." International Journal of Spectroscopy 2016 (March 16, 2016): 1–6. http://dx.doi.org/10.1155/2016/4589460.

Full text

Abstract:

This study investigates the level of technological enhancement of normally occurring radioactive materials (TENORM) in the red mud waste due to the production of alumina in Jamaica. Technological enhancements factors (TEF) were determined for the uranium, thorium, actinium series, their progenies, and the nonseries potassium-40 using gamma spectrometry. The study concluded that bauxite production technologically enhances the uranium progenies Th-234, Pb-214, Bi-214, and Pa-234 and the thorium-232 progenies Ac-228, Pb-212, and Bi-212 in red mud. The actinium series was technologically enhanced, but K-40 and the thorium daughter, Tl-208, were reduced. The spectrometric comparison of Tl-208 (at 510 keV) was unexpected since its other photopeaks at 583 keV, 934 keV, and 968 keV were markedly different. An explanation for this anomaly is discussed. An explanation regarding the process of accumulation and fractionation of organically derived phosphate deposits and potassium-feldspar is offered to explain the spectrometric differences between the alumina product and its waste material, red mud.

APA, Harvard, Vancouver, ISO, and other styles

44

Padamata, Sai Krishna, Andrey Yasinskiy, and Peter Polyakov. "A Review of Secondary Aluminum Production and Its Byproducts." JOM 73, no. 9 (July 30, 2021): 2603–14. http://dx.doi.org/10.1007/s11837-021-04802-y.

Full text

Abstract:

AbstractSecondary aluminum production is required for the conservation of the environment. It can significantly reduce greenhouse gas emissions and energy consumption and reduce the consumption of alumina, a source of primary aluminum. Secondary aluminum production requires sorting processes for the metal scrap before starting the refining process. Salt slags generated from both primary and secondary aluminum production need to be recycled/treated as they are considered hazardous byproducts. This review paper discusses the methods used for sorting and refining aluminum waste and managing and utilizing slag cakes/slag from recycling techniques.

APA, Harvard, Vancouver, ISO, and other styles

45

Mazzanti, Francesca, Alida Brentari, Emiliano Burresi, Antonino Coglitore, Martino Labanti, Stefano Martelli, Claudio Mingazzini, et al. "Exploitation of Ceramic Wastes by Recycling in Alumina-Mullite Refractories." Advances in Science and Technology 70 (October 2010): 9–14. http://dx.doi.org/10.4028/www.scientific.net/ast.70.9.

Full text

Abstract:

Alumina-mullite (AM) refractories are widely used as liners in gas turbines for power production, because of their peculiar properties, appropriate for the thermal insulation of combustion chambers, characterized by turbine inlet temperature around 1400 °C. The typical tiles are made with a mixture of alumina and mullite with different granulometries, including a coarse fraction. In this work the feasibility of recycling of ceramic wastes, which come from other industrial processes, into AM refractories was assessed. The effects of their addition on phase composition, microstructure and thermomechanical properties of AM refractories were investigated. MOR and Young’s modulus were determined at room temperature and up to 1500 °C by four point flexural tests; thermal shock resistance was evaluated by MOR measurements after quenching tests. The comparison with a typical AM refractory used as liners shows that thermomechanical properties and thermal shock resistance were not significantly compromised by ceramic waste additions up to 20%, and, on the contrary, were improved.

APA, Harvard, Vancouver, ISO, and other styles

46

Burdonov, Alexander, Vyacheslav Barakhtenko, Konstantin Prokhorov, and Yuri Novikov. "Features of metallurgy waste mainly processing with account for raw material contrast." E3S Web of Conferences 192 (2020): 02026. http://dx.doi.org/10.1051/e3sconf/202019202026.

Full text

Abstract:

This work presents research studies of alumina-containing estimates formed during the production of aluminum on electrolyzers with self-burning anodes during technological operations at PJSC RUSAL Bratsk. Material from the territory of the electrolysis workshop, with a mark of ± 0, is a mixture of finely dispersed powder, 2.5 mm in size (on average 62.78% by weight) with pieces of material from 0.5 to 6 cm in size. , 26% by weight). As a result of the work, the particle size and chemical-metallurgical properties of an alumina-containing estimate were studied. During the research, the content of valuable components and impurities in the sample of various classes was determined. In the process of mineralogical analysis, two phases were identified in the products: dark, black-gray and light, grayish-white. It is proved that these phases have significant differences in the chemical composition of the feed. Spectroscopic studies showed significant differences in the colorimetric characteristics of the raw materials, which is a fundamental factor for the use of photometric separation. Based on preliminary studies on the separation of alumina-containing estimates by photometric separation, the fundamental possibility of purifying contaminated material from technological impurities has been established.

APA, Harvard, Vancouver, ISO, and other styles

47

Lee, SeungMin, Pavel Hrma, Richard Pokorny, Jaroslav Klouzek, Bradley J. VanderVeer, Carmen P. Rodriguez, Jaehun Chun, Michael J. Schweiger, and Albert A. Kruger. "Effects of alumina sources (gibbsite, boehmite, and corundum) on melting behavior of high-level radioactive waste melter feed." MRS Advances 2, no. 11 (December 23, 2016): 603–8. http://dx.doi.org/10.1557/adv.2016.644.

Full text

Abstract:

ABSTRACTTypes of melter feed materials affect glass production rates. This study focuses on the effects of alumina sources on melting behavior of high-alumina high-level-waste melter feeds containing different alumina sources, namely, gibbsite, boehmite, and corundum. The heat flow from the glass melt to the cold cap, a floating layer of the reacting feed, is partially hindered by a foam layer at the bottom of the cold cap. Volume expansion tests and thermoanalytical methods revealed that a slow-melting feed with corundum foamed extensively, whereas a fast-melting feed with boehmite had a low reaction heat and produced less stable foam. The foam thickness, a critical factor for the rate of melting, estimated using the relationship between the heat conductivity and foam porosity was in reasonable agreement with experimental observation.

APA, Harvard, Vancouver, ISO, and other styles

48

Oti, Jonathan, John Kinuthia, and Blessing Adeleke. "The Strength Characterisation of Concrete Made with Alumina Waste Filler." Sustainability 12, no. 24 (December 8, 2020): 10235. http://dx.doi.org/10.3390/su122410235.

Full text

Abstract:

This study covers an in-depth investigation into the properties and practicality of the utilization of up to 40% Alumina Waste Filler (AWF) as a partial Portland Cement (PC) replacement material. AWF is a by-product from the recycling of aluminium, produced when salt slag is smelted and cleaned. Its use in concrete will lessen the landfill requirements for AWF disposal, and reduce the strain of the growing requirements and cost of PC. The results obtained from this study showed that the addition of AWF to the concrete mix caused a reduction in the compressive and tensile splitting strength values, and a less-workable concrete was achieved for every increase in the quantity of AWF added to each mix. The addition of AWF influenced the hydration reaction process and reduced the cumulative production of the heat of hydration over time, whilst the permeability of the concrete decreased.

APA, Harvard, Vancouver, ISO, and other styles

49

Brasileiro, Maria Isabel, Romualdo Rodrigues Menezes, M. O. Farias, Hélio Lucena Lira, Gelmires Araújo Neves, and Lisiane Navarro de Lima Santana. "Use of Kaolin Processing Waste for the Production of Mullite Bodies." Materials Science Forum 591-593 (August 2008): 799–804. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.799.

Full text

Abstract:

Mullite is a versatile material used in traditional and advanced ceramic, due to low thermal expansion, high thermal shock and creep resistance. The production of waste from ore industry is a problem that is increasing nowadays. The kaolin processing industry produces residue rich in Al2O3 and SiO2. These oxides are good precursors to produce mullite. The aim of this work is to use the residue from kaolin industry to produce mullite ceramic bodies. It was studied alumina, clay and residue from kaolin processing as raw materials. The material was dried and pressing in uniaxial press (30MPa). The samples were sintered at temperatures of 1450oC, 1500oC, 1550oC and 1600oC. The ceramic bodies were characterized by X-ray diffraction. The density was measured by Archimedes method and the flexural strength by the three point bending technique. The results showed that is possible to produce mullite with high amount of waste from kaolin processing.

APA, Harvard, Vancouver, ISO, and other styles

50

Najib Khan, Abdul Shafiq Khan A., Nur Ezzah Faezah Othman, Hadi Purwanto, Hafasihah Abdul Halim, and Ahmad Firdaus Shamsul Baharin. "Synthetic of Pure Alumina from Aluminum Scrap." Advanced Materials Research 1115 (July 2015): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.170.

Full text

Abstract:

Abundance in aluminum scrap metals can cause problem such as limited space allocation and pollution. The solution to solve these problems were by recycling the aluminum scrap metal as secondary production of aluminum. Among the recycling process alternative is smelting, However, the process consumes high energy with low productivity. This study focuses on alumina production from aluminum scrap waste. Dissolution process of Al scrap with 0.5M sodium hydroxide (NaOH) yields Al (OH)3and hydrogen gas. Results show that the temperature gradually decreased from 40°C to 35.7°C as the reaction took place. The pH of the solution during dissolution process increased from 12.08 to 12.38. The XRD results show that after calcination of Al (OH)3powders at 1500°C, α-Al2O3peaks could be observed. SEM morphology shows that the calcination process changes the Al (OH)3powders from hexagonal shape to form α-Al2O3with rounded shape.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!