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1
Darin, Aleksey A., e Nail M. Telyakov. "Investigation of Sulfatization Mechanism of Iron-Manganese Concretions in Fluidized Bed". Solid State Phenomena 299 (gennaio 2020): 475–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.475.
Abstract (sommario):
The article presents the theoretical basis of sulfatizing roasting in the fluidized bed of oxidic and sulphidic polymetallic raw materials: iron-manganese concretions (IMC) containing non-ferrous metals and pyrite concentrate. The results of preliminary thermodynamic and thermogravimetric studies of IMC of Pacific Ocean and pyrite are described. The results of the laboratory-scale research of sulphatizing roasting of deep-water polymetallic IMC and pyrite concentrates are given. Based on the results obtained, the conclusion is made about the prospects of using the method of preliminary sulfatization for further production of marketable concentrates of manganese and non-ferrous metals.
2
Zhao, Feng, Xunxiong Jiang, Shengdong Wang, Linyong Feng e Da Li. "The Recovery of Valuable Metals from Ocean Polymetallic Nodules Using Solid-State Metalized Reduction Technology". Minerals 10, n. 1 (25 dicembre 2019): 20. http://dx.doi.org/10.3390/min10010020.
Abstract (sommario):
Ocean polymetallic nodules are oxide ores rich in Ni, Co, Cu, and Mn, which are valuable metals found in deep-sea mineral resources. Such non-ferrous metals do not exist in isolation, and producing concentrates using conventional mineral separation techniques is challenging without pre-treatment. We propose an effective, environmentally-friendly recovery technology combined with solid-state metalized reduction treatment and magnetic separation to recycle these metals from ocean polymetallic nodules. We conducted single-factor tests to investigate the effects of additives, anthracite dosage, duration, and reduction temperature on metal recovery and to obtain optimal operating parameters. We found that valuable metals in ocean polymetallic nodules may be selectively reduced to a metallic state. Only a fraction of Mn was reduced to metal. The reduced metals were recovered to concentrates using magnetic separation. More than 80% of these metals were concentrated to magnetic concentrates with mass ratios of 10–15%. The recovery rates of Ni, Co, Cu, Mn, and Fe in concentrates were optimum at 86.48%, 86.74%, 83.91%, 5.63%, and 91.46%, respectively, when using CaF2 4%, anthracite 7%, SiO2 dosage 5%, and FeS 6% at 1100 °C for 2.5 h. This approach to non-ferrous metal extraction using conventional hydrometallurgical processes could be a step toward practical industrial-scale techniques for the recovery of metals from polymetallic nodules.
3
Li, Zhixing, Mingkuan Qin, Yuqi Cai, Longsheng Yi, Wenquan Wang, Jian Wang e Longlong Li. "New Evidence of Submarine Exhalative Sedimentation in the Uranium-Polymetallic Phosphorite Deposit in Baizhuyu, Hunan, China". Minerals 12, n. 7 (29 giugno 2022): 826. http://dx.doi.org/10.3390/min12070826.
Abstract (sommario):
There are as many as 25 kinds of minerals (including non-ferrous metals, ferrous metals, rare and dispersed elements, precious metals, non-metallic and energy minerals) enriched in uranium-polymetallic fertile beds in black rock series, which is therefore widely attracting scholars all over the world. However, there is still great controversy in terms of the metallogenic mechanism in such beds. The black rock series have been systematically sampled from the Baizhuyu deposit in northwestern Hunan Province, China based on field geological and radioactivity surveys. Major and trace elements as well as rare earth elements (REE) of uranium-polymetallic phosphorite and its wall rocks were analyzed. Furthermore, carbon and oxygen isotopes, Sm-Nd isotopes, and mineralogy of the Baizhuyu deposit were studied. The results show that dolomite is a normal marine sediment, while and uranium-polymetallic elements were pre-enriched in phosphorites and black carbonaceous argillaceous shales and slates that formed from marine sedimentation and submarine exhalative sedimentation. Hydrothermal reworking to uranium-polymetallic phosphorites is significant as a result of submarine exhalative sedimentation. The research results of this paper can support a better understanding of metallogenesis and the future exploration of uranium-polymetallic phosphorite in the Lower Cambrian Niutitang Formation in the study area.
4
Vardanyan, Narine S., Garegin G. Sevoyan e Arevik K. Vardanyan. "Bioleaching of Tailings Resulting from Benefication of Polymetallic Ores for Recovery of Valuable Metals". Solid State Phenomena 262 (agosto 2017): 113–17. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.113.
Abstract (sommario):
Concentrated tailings samples resulting from the benefication of polymetallic ores (Armenia) were exposed to bioleaching in order to recover non-ferrous and precious metals. Bioleaching of concentrated tailings samples was performed by the natural microbial consortium of drainage water. It was shown that the extent of extraction of metals from two samples of concentrated tailings by the natural microbial consortium reached 55, 56% and 63, 73% for copper and zinc, respectively. However, the application of the natural microbial consortium together with an iron- oxidizing Acidithiobacillus sp.13Zn resulted in an increase of extraction of metals from concentrated tailings to 70 - 93% for Cu and 75 - 90% for Zn. Thus, to increase the recovery of non-ferrous and precious metals, the use of a natural microbial consortium of drainage water combined with an iron- and sulfur- oxidizing Acidithiobacillus sp.13Znis proposed.
5
Fomchenko, Natalya, Taisiia Uvarova e Maxim Muravyov. "Effect of mineral composition of sulfidic polymetallic concentrates on non-ferrous metals bioleaching". Minerals Engineering 138 (luglio 2019): 1–6. http://dx.doi.org/10.1016/j.mineng.2019.04.026.
6
Evdokimov, Alexander. "Heavy metals in the organic soil horizon of the Northern taiga forests resulting from industrial air pollution". E3S Web of Conferences 169 (2020): 01011. http://dx.doi.org/10.1051/e3sconf/202016901011.
Abstract (sommario):
This study focuses on heavy metals contained in organic soil horizons resulting from the industrial air pollution caused by local enterprises. Polymetallic dust containing heavy metals is one of the main by-products in the smelting of non-ferrous metals. We evaluated the contents of Ni, Cu, and Co in the upper soil horizons containing the maximum amount of these pollutants (due to the formation of stable compounds with organic components of these horizons). Sampling was carried out at various distances from the source of pollution at previously established test sites. The study found acid-soluble heavy metals at various distances from the source of pollution and revealed the regularity of their content, both qualitative and quantitative.
7
Epiforov, Alexander V., Aleksey N. Seleznev, Yuriy Ye Emelyanov, Stanislav V. Balikov, Lyudmila Ye Shketova e Natalia V. Kopylova. "Heap Biooxidation of Gold-Sulphide and Polymetallic Ores and Tailings". Solid State Phenomena 262 (agosto 2017): 122–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.122.
Abstract (sommario):
Heap biooxidation is the most economic option of treating processing plants tailings and refractory ores containing non-ferrous and precious metals and sulphides.Pyrite tailings of copper ore processing (Sample 1), tailings of sulphide copper-nickel ore processing (Sample 2) and double refractory gold-bearing ore (Sample 3) were studied.Autotrophic microorganisms Acidithiobacillusthiooxidans and Acidithiobacillusferrooxidans were used for the tests. The duration of heap biooxidation tests for Samples 1, 2 and 3 was 6, 10 and 16 months, respectively. The rates of copper and zinc recovery into solution during heap biooxidation of Sample 1 were 68% and 71%, respectively; the rates of copper and nickel recovery from Sample 2 were 50% and 75%, respectively. Base metals were extracted from solution to selective high-grade concentrates after biooxidation.Biooxidation tailings of Samples 1 and 3 were leached using an alkaline sodium cyanide solution. The recovery of gold from Sample 1 and Sample 2 was 65% and 85%, respectively.
8
Litvinov, V. V., N. A. Strunnikova, G. K. Daumova, N. V. Seraya, O. Mutere e S. S. Utin. "OPTIMAL CONDITIONS FOR LIME TREATMENT OF MINE WASTEWATER FROM POLYMETALLIC ORE MINES". Bulletin D. Serikbayev of EKTU, n. 1 (marzo 2024): 179–89. http://dx.doi.org/10.51885/1561-4212_2024_1_179.
Abstract (sommario):
Mine waters of polymetallic mines are multicomponent systems containing ions of heavy non-ferrous metals, calcium, magnesium, iron, ammonium, as well as chlorides, sulfates, fluorides and other components in a wide range of concentrations. As a rule, water purification of this type is carried out by the lime method, which provides a fairly high degree of extraction of the most toxic pollutants (metals), with relatively small material costs. Taking into account the large volume, complexity and variation of the composition of mine waters, the tasks of optimizing reagent consumption, methods of its supply and effective control of the purification process still do not lose their relevance. The article presents the results of laboratory studies to determine the optimal conditions for processing model solutions that provide the maximum degree of purification for specific conditions of the Irtysh mine (East Kazakhstan). Experimental data obtained on model solutions are confirmed by the results of purification of real mine waste water. The results of experiments with mine water confirmed that the selected pH region of 9.5–10.5 can be accepted as optimal, which will allow achieving a high degree of purification of mine water.
9
Mammedov, Аlesger, Shahbeddin Musaev, Yaroslava Poshivaylo e Grigory Fedotov. "GI support of geological exploration of non-ferrous metal ore deposits". InterCarto. InterGIS 26, n. 2 (2020): 120–36. http://dx.doi.org/10.35595/2414-9179-2020-2-26-120-136.
Abstract (sommario):
Geoinformation technologies are applied, without exaggeration, in all spheres of human activity, and the geological industry is no exception. Geoinformation systems in geology help to solve a number of practical problems. Geologists specializing in mineral exploration use a variety of data sets to search for new, cost-effective deposits, from geological maps, hyperspectral aerial photographs and multispectral satellite imagery to databases of various formats. The geographic information system is an ideal platform for combining such heterogeneous information and its subsequent analysis. The article describes the experience of the national mining company of the Republic of Azerbaijan CJSC AzerGold in the use of geographic information systems in the exploration of non-ferrous metal deposits using the example of the development of the Filizchay and Aghyokhush deposits. The authors considered production problems, described the problems that arise at the stage of exploration and proposed methods for solving them, the need for the integrated use of information systems in exploration when searching for deposits of non-ferrous metals is noted. A database structure has been developed for the purpose of geological exploration of non-ferrous metal ores, including sections such as topography, geochemistry, geophysics, structural geology. The structure of geoinformation support for geological exploration of non-ferrous metal ores is proposed, which combines the functionality of geographic information systems (GIS) and mining geological information systems (MGIS). The stages of geoinformation processing of initial data are illustrated, on the basis of which a geological exploration strategy was formed at the Filizchay pyrite-polymetallic deposit, and then the optimal places and number of wells, coordinates, directions and angles of incidence of wells were determined quickly and with high accuracy, as well as the resource potential was specified. The role of interpolation methods in determining the primary exploration wells in the exploration of the Agyokhush gold deposit is disclosed.
10
Nokhrina, O. I., I. D. Rozhikhina, I. A. Rybenko, M. A. Golodova, e A. O. Izrail’skii. "Hydrometallurgical enrichment of polymetallic and ferromanganese ore". Izvestiya. Ferrous Metallurgy 64, n. 4 (4 giugno 2021): 273–81. http://dx.doi.org/10.17073/0368-0797-2021-4-273-281.
Abstract (sommario):
The article presents the results of theoretical and experimental studies of leaching of polymetallic manganese-containing and ferromanganese ore. Thermodynamic calculations and experimental studies on enrichment of manganese-containing raw materials made it possible to determine the main technological parameters of the extraction of manganese, iron and non-ferrous metals, and to develop technological schemes for enrichment of various types of manganese-containing raw materials. The studies were carried out for polymetallic and ferromanganese ores of the Kaigadat deposit, the Selezen deposit, the Sugul site, located in the Kemerovo Region – Kuzbass. Before carrying out laboratory studies, the authors have performed thermodynamic analysis of ore leaching, chemical and X-ray structural analyzes of the samples. Laboratory tests were carried out on a multichamber autoclave unit MKA-4-75 using calcium and iron chlorides as solvents. Since the introduction of a reducing agent into the charge during leaching significantly improves the conditions for dissolution of oxides and hydroxides of manganese in calcium chloride, a series of experiments was conducted with the use of charcoal in the charge. Thermodynamic calculations have shown that the leaching process is fully implemented in the temperature range from 323 to 673 K. The results of the experiments confirmed the theoretical research results. The obtained data allowed the authors to propose a technological scheme for hydrometallurgical enrichment of polymetallic and ferromanganese ores to produce high-quality concentrates. All processed products are suitable for use. The use of optimal technological parameters of enrichment allows 95–97 % of manganese, up to 80 % of nickel, up to 99 % of cobalt, and 96–98 % of iron to be extracted from polymetallic manganese-containing raw materials. As a result of the deposition of these elements, high-quality concentrates of manganese, nickel, iron, cobalt are obtained. According to the proposed technological scheme for ferromanganese raw materials with a high content of silicates, it is possible to obtain high-quality concentrates of manganese and iron, while the extraction of manganese is 90–92 %, and of iron – 86–90 %.
11
Evdokimov, Alexander S., e Vasily T. Yarmishko. "The tree layer structure of forest communities of the Kola Peninsula central part formed when aerotechnogenic emissions reduced". RUDN Journal of Ecology and Life Safety 31, n. 1 (15 dicembre 2023): 115–26. http://dx.doi.org/10.22363/2313-2310-2023-31-1-115-126.
Abstract (sommario):
This research provides an overview of the main component of forest ecosystems in northern Europe, the tree layer formed by the Scotch pine (Pinus sylvestris L .) species. The studied communities are located in the immediate vicinity of the largest plant in Europe, OAO Severonickel (Monchegorsk, Murmansk region). The main pollutants are polymetallic dust containing elements such as Cu, Ni and Co (which are by-products of processing and smelting non-ferrous ores) and sulfur dioxide - SO2 (which is formed during the primary processing of ores, the so-called “roasting”). The first permanent trial plots (PPPs) in this region were established in the early 1970s. Since the second half of the 1990s, the plant has significantly reduced the amount of aerotechnogenic emissions, as evidenced by the data noted by some researchers at that time. The cumulative nature of the accumulation (and release) of polymetallic dust led to the fact that, starting from the time the ore processing plant reduced its capacity, the concentration of metals contained in the soil and plant organs decreased to a certain level. We present the materials obtained in the course of field research in 2015-2018.
12
Sommerfeld, Marcus, David Friedmann, Thomas Kuhn e Bernd Friedrich. "“Zero-Waste”: A Sustainable Approach on Pyrometallurgical Processing of Manganese Nodule Slags". Minerals 8, n. 12 (23 novembre 2018): 544. http://dx.doi.org/10.3390/min8120544.
Abstract (sommario):
A continuously growing demand for valuable non-ferrous metals and therefore an increase in their prices at the metal exchanges makes it necessary and profitable to investigate alternative metal resources. Polymetallic deep-sea nodules contain cobalt, copper, manganese, molybdenum and nickel, and are highly abundant on the sea floor. Developing a metallurgical process to recover the metal content from manganese nodules can close the predicted supply gap of critical metals like cobalt. This paper investigated a potential extraction process for valuable metals from manganese nodules supplied by the German Federal Institute for Geosciences and Natural Resources. The samples originated from the German license area of the Clarion-Clipperton Zone in the Pacific Ocean. Due to a low concentration of valuable metals in nodules, a pyrometallurgical enrichment step was carried out to separate cobalt, copper, molybdenum and nickel in a metallic phase. The manganese was discarded in the slag and recovered in a second smelting step as ferromanganese. To aid the experiments, FactSageTM was used for thermodynamic modeling of the smelting steps. To increase metal yields and to alter the composition of the metal alloys, different fluxes were investigated. The final slag after two reduction steps were heavy-metal free and a utilization as a mineral product was desired to ensure a zero-waste process.
13
Artemyev, D. A., A. D. Degtyareva, S. V. Kuzminykh e L. B. Orlovskaya. "Non-ferrous metal of the Bronze Age of Northern Kazakhstan: geochemical characteristics and ore base". VESTNIK ARHEOLOGII, ANTROPOLOGII I ETNOGRAFII, n. 1(64) (15 marzo 2024): 19–37. http://dx.doi.org/10.20874/2071-0437-2024-64-1-2.
Abstract (sommario):
The chemical composition of 29 copper and bronze artifacts from the sites of the Petrovka and Alakul Cultures located be-tween the Tobol and Ishim Rivers (the burial grounds of Bekteniz and Dzhangildy 5, and the sites of Novonikolskoye 1 and Semioz-ernoye 2; Northern Kazakhstan) were analysed using mass spectrometry with inductively coupled plasma and laser ablation. The sites are 14C dated to the interval between the 19th–17th centuries BC. In the examined sample, the leading metallurgical group with a slight prevalence in both Petrovka and Alakul metals was “pure” copper; the second part of the metal was represented by tin bronzes — low-alloyed (up to 8 wt.% Sn) in the Petrovka, and high-alloyed (Sn up to 21 wt.%) in the Alakul Culture. The statistical analysis of the main components of trace elements in the metal demonstrated a division into six main geochemical groups. Among these, tin bronzes with an uninterpretable copper component (10 specimens), “pure” copper of Ural origin with Fe-Co-Ni-As-Zn correlations (9 specimens), and “pure” copper with polymetallic Sn-Pb-As-Ag-Se specialization (10 copies), corresponding to the ores of copper deposits of the Kokshetau anticlinorium, can be identified. An overview of the tectonic structures of Northern Ka-zakhstan shows the nearby presence of several porphyry copper and skarn deposits with ancient mines (Imantau, Baksinskoye, Akkan-Burlukskoye, etc.), which likely served as sources of copper ore. Closely associated with these are Greisen and quartz-vein-greisen tin deposits, but there is no reliable information about their use in ancient times. According to the composition of tin alloys in the analysed metal, two main types can be distinguished: tin (without correlation with other impurity elements) when using pure cassiterite, and tin-lead (with increased concentrations and correlation of As, Au, Bi, etc.) when using cassiterite-sulfide ores. The data show the association of the Bronze Age sites of Northern Kazakhstan with the ore and raw materials base in this region, and the intensity of trade exchange of metallurgical products between the Ural and Kazakhstan centers of metal production.
14
Matveeva, Tamara N., Viktoriya V. Getman, Nadezhda K. Gromova e Anna Yu Karkeshkina. "Contemporary Research and Developments in the Low-Toxic Chelating Reagents for the Extraction of Non-Ferrous and Noble Metals from Poor Polymetallic Ores and Processing Tailings". Sustainability 14, n. 23 (6 dicembre 2022): 16262. http://dx.doi.org/10.3390/su142316262.
Abstract (sommario):
An urgent technological, economic and environmental task of mining and metallurgical enterprises is to involve poor, off-balance and hard-to-beneficiate ores in the technological process, as well as accumulated and current waste from mining and metallurgical industries. As the reserves of developed deposits are depleted, technogenic objects may become a priority, and in some cases the only, source of mineral raw materials. Mining wastes represent a large reserve of raw materials for the extraction of non-ferrous and precious metals, and at the same time, they are centers of local or regional environmental pollution. Stale waste re-processing may promote territorial cultivation and reduce the environmental burden. The conventional methods of poor ore and waste treatment do not fully provide for a sufficient separation degree of high metal extraction, and lead to significant valuable ore losses, while the quality of the obtained concentrates often does not meet the requirements for subsequent technological process. In this regard, the development of novel chelating agents with specific functional groups that can selectively adsorb on the mineral surface, change the contrast of chemical surface composition and improve the flotation properties of mineral complexes, is an innovative solution for increasing their flotation selectivity. Furthermore, the synthesis and application of novel flotation reagents may help to replace toxic reagents by ecologically friendly or less-toxic ones.
15
Khassenov, A. K., D. Zh Karabekova, G. A. Bulkairova, D. А. Nurbalayeva e M. Stoev. "Electro-pulse method for obtaining raw materials for subsequent flotation enrichment of ore". Bulletin of the Karaganda University. "Physics" Series 101, n. 1 (30 marzo 2021): 57–62. http://dx.doi.org/10.31489/2021ph1/57-62.
Abstract (sommario):
The main method of enrichment of polymetallic ores is flotation. The peculiarity of solid mineral processing is the preliminary preparation of raw materials. The essence of this stage is the grinding and sorting of raw materials in order to fully reveal the useful substance from the waste rock. The article is devoted to the study of the effect of electric pulse discharges on the grinding of ore containing non-ferrous metals. This article proposes an electro-pulse method for obtaining raw materials for subsequent flotation enrichment of ore in order to extract valuable components. This method of grinding ores is based on the use of the energy of a pulsed shock wave that occurs as a result of a spark electric discharge in a liquid. An experimental electric pulse unit with a crushing unit is described. When electrohydraulic action on solid particles in an aqueous solution increases the intensity of the grinding process under the influence of additional pressure associated with cavitation. The object of the study was the natural ore of the Akbastau mine. Ore grinding operations were performed at various parameters of the electric pulse plant. The dependences of ore grinding on the electrical and geometric parameters of the electric pulse installation, the value of the interelectrode gap on the switching device, the pulse repetition frequency and discharge energies are determined. It is found that with increasing discharge energies introduced into the discharge channel, the fraction of the crushed fraction increases.
16
Elkina, Yuliya, Aleksandra Nechaeva, Alena Artykova, Aleksandr Kolosoff, Aliya Bugubaeva, Vitaliy Melamud, Andrey Mardanov e Aleksandr Bulaev. "Continuous Bioleaching of Arsenic-Containing Copper-Zinc Concentrate and Shift of Microbial Population under Various Conditions". Minerals 12, n. 5 (6 maggio 2022): 592. http://dx.doi.org/10.3390/min12050592.
Abstract (sommario):
The goal of this work was to study the bioleaching of arsenic-containing polymetallic concentrate that contained 6.2% Cu, 7.3% Zn and 1.7% As, depending on different temperatures and in the presence of CO2 and molasses in the medium, as well as the difference in the composition of microbial population formed under various conditions. A mixed population of moderately thermophilic and thermotolerant acidophilic microorganisms formed during the continuous bioleaching of copper concentrate was used as an inoculum. The experiments were carried out in a continuous mode in laboratory scale reactors, with a temperature range of 40 °C to 60 °C. To assess the effect of CO2 and molasses on metal leaching and microbial population composition, the experiments were carried out in three reactors: CO2 (~0.01 L/min) was supplied into the first reactor; 0.02% molasses were added to the pulp of the second reactor; and no additional carbon sources were supplied into the control reactor. The highest copper recovery (27%) was achieved at 50°C in the experiment with molasses, while the highest zinc recovery (82.1%) was reached at 45°C in the control experiment. Additional carbon sources affected the extraction of non-ferrous metals only at 60 °C and increased the extraction of copper and zinc by 12.6% and 24.2%, respectively. Both the temperature and carbon source used affected the microbial population composition. The main microbial genera revealed in the populations by next generation sequencing (NGS) were bacteria of the genera Sulfobacillus and Acidithiobacillus, as well as archaea of the genera Ferroplasma, Acidiplasma, and Cuniculiplasma. At low temperatures (40 and 45 °C), Acidithiobacillus, Sulfobacillus, and Ferroplasma predominated, while at temperatures 50–55 °C, the decrease in relative abundance of these genera occurred, and the predominance of Acidiplasma archaea was observed. The usage of both CO2 and molasses led to the increase in Sulfobacillus and Acidiplasma in relative abundance.
17
Bulaev, Aleksander. "Hydrometallurgical Processing of the Wastes of Polymetallic Ore Dressing". KnE Materials Science, 31 dicembre 2020. http://dx.doi.org/10.18502/kms.v6i1.8067.
Abstract (sommario):
The possibility of hydrometallurgical treatment of old flotation tailings to extract base and noble metals was investigated. Two samples of old flotation tailings samples containing 0.26% and 0.36% of copper, and 0.22% and 0.23% of zinc were the subjects of this study. Agitation and percolator leaching was performed with distilled water and sulfuric acid solutions (of 0.5 to 10% H2SO4). It was shown that under certain conditions (sulfuric acid concentration) it was possible to achieve selective leaching of non-ferrous metals and obtain solutions with relatively low concentrations of iron ions, which is necessary for further effective extraction of non-ferrous metal ions from the solution. The effect of acid leaching on further gold recovery from the first sample containing 0.7 g/t of gold by cyanidation was investigated. The sample of the tailings after leaching with a 1% sulfuric acid solution was leached with 10% sulfuric acid. After that, the tailings sample and the acid leach residues were subjected to sorption cyanidation. Two-stage acid leaching with 1 and 10% sulfuric acid provided the higher gold recovery than one-stage (49 and 65%, respectively). Also it was shown that pregnant solution obtained during leaching of the second sample with 10% sulfuric acid may be used for oxidative leaching of substandard copper-zinc concentrate that allowed to 13 and 48% of copper and zinc from the concentrate during the leaching at 80∘C.
Keywords: flotation tailings, leaching, substandard sulfide concentrates
18
Bocharov, V. A., V. A. Ignatkina, L. S. Khachatryan e G. A. Lapshina. "Development of technology of complex processing of refractory pyrite polymetallic ores of Non-ferrous metals". Tsvetnye Metally, 28 aprile 2018, 27–34. http://dx.doi.org/10.17580/tsm.2018.04.03.
19
Kekelia, S., Nona Gagnidze, I. Mshvenieradze e G. Kharazishvili. "Volcanogenic Deposits of Non-ferrous Metals in the Lesser Caucasus and Eastern Pontides". Journal of Geological Research 3, n. 4 (23 ottobre 2021). http://dx.doi.org/10.30564/jgr.v3i4.3572.
Abstract (sommario):
The paper presents brief characteristics of geological environments of ore deposit occurrences in Turkey, Georgia and Armenia. They can be attributed to Kuroko-type deposits, being distinguished by the character of ore accumulation. To the west, in Turkey, there are epigenetic and hydrothermal-sedimentary copper-zinc deposits that were formed in deep restricted basinal settings. An example of the latter is the Chayeli deposit.To the east, in the Caucasus, we have predominantly only epigenetic deposits. Besides, in the Bolnisi mining district (Georgia) there is the Madneuli deposit which represents an example of polyformational deposit. Here, within the restricted territory, have been concentrated:barite, barite-polymetallic, gold-bearing secondary quartzite, large-scale stockworks of copper ores. Judged by the 87Sr/86Sr ratios, some volcanites which are spatially associated with ores, might have been products of the “differentiation” of undepleted mantle, or other magmas that were generated in the lower part of the earth crust.In the Alaverdi ore district in Armenia, there are Jurassic volcanodepressions that host copper, copper-zinc and barite-sulfide ores. All the deposits of the Alaverdi district, porphyry copper including, contain economic reserves of ores.On the basis of available literature material and our own data, there has been created a mental-logical geological-genetic model of volcanogenic deposits.
20
Kozlov, P. A., A. M. Panshin e L. I. Leontiev. "Physical and Chemical Fundamentals and Technical Solutions for Recovery of Non-ferrous and Rare Metals from Industrial Wastes". KnE Materials Science, 31 dicembre 2020. http://dx.doi.org/10.18502/kms.v6i1.8115.
Abstract (sommario):
The increasing demand for zinc and a range of zinc-related metals (for example: lead; indium; tin; cadmium; and copper) in the Russian Federation cannot be satisfied by the existing production plants due to the lack of raw materials. At the same time, ferrous and non-ferrous metallurgy and the chemical industry have accumulated hundreds of millions of tons of zinc wastes (falling into the hazard categories 2 to 4), the processing of which could not only make up the raw material base, but also improve the environmental situation. In the world, over 85% of ferrous dust is recycled using the Waelz process. The Waeltz process is used for distilling separation of elements under reducing conditions. In this study, a block diagram for production of the following elements from industrial wastes is proposed: zinc, cadmium and indium in form of massive metals; zinc and indium in the form of fine powders; and clinker as a raw material for cement production. The technical and scientific details of this new process have been patented in the Russian Federation and abroad. For the first time, the following operations have been implemented with the use of large-sized Waelz kilns: vapour-oxidized Waeltz treatment of polymetallic wastes; recycling of heat from gases and solid products with generation of process fumes; and implementation of alternative flux (dolomite) and alternative fuel (petroleum coke).
Keywords: Waelz process, industrial wastes, heat recycling, vapour-oxidized Waelz processing