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Kirill Karimov
Department of Non-Ferrous Metals Metallurgy, Ural Federal University, 620002 Yekaterinburg, Russia

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Journal article
Published: 17 June 2021 in Metals
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The processing of low-grade polymetallic materials, such as copper–zinc, copper–lead–zinc, and poor arsenic-containing copper concentrates using hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in ores. Ferric arsenates obtained through hydrothermal precipitation are the least soluble and most stable form of arsenic, which is essential for its disposal. This paper describes the investigation of the oxidation kinetics of As (III) ions to As (V) which is required for efficient purification of the resulting solutions and precipitation of low-solubility ferric arsenates. The effect of temperature (160–200 °C), the initial concentration of Fe (II) (3.6–89.5 mmol/dm3), Cu (II) (6.3–62.9 of mmol/dm3) and the oxygen pressure (0.2–0.5 MPa) on the oxidation efficiency of As (III) to As (V) was studied. As (III) oxidation in H3AsO-Fe2+-Cu2+-H2SO4 and H3AsO-Fe2+-H2SO4 systems was controlled by a chemical reaction with the apparent activation energy (Ea (≈84.3–86.3 kJ/mol)). The increase in the concentration of Fe (II) ions and addition of an external catalyst (Cu (II) ions) both have a positive effect on the process. When Cu (II) ions are introduced into the solution, their catalytic effect is confirmed by a decrease in the partial orders, Fe (II) ions concentration from 0.43 to 0.20, and the oxygen pressure from 0.95 to 0.69. The revealed catalytic effect is associated with a positive effect of Cu (II) ions on the oxidation of Fe (II) to Fe (III) ions, which further participate in As (III) oxidation. The semi-empirical equations describing the reaction rate under the studied conditions are written.

ACS Style

Kirill Karimov; Denis Rogozhnikov; Oleg Dizer; Maksim Tretiak; Sergey Mamyachenkov; Stanislav Naboichenko. Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System. Metals 2021, 11, 975 .

AMA Style

Kirill Karimov, Denis Rogozhnikov, Oleg Dizer, Maksim Tretiak, Sergey Mamyachenkov, Stanislav Naboichenko. Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System. Metals. 2021; 11 (6):975.

Chicago/Turabian Style

Kirill Karimov; Denis Rogozhnikov; Oleg Dizer; Maksim Tretiak; Sergey Mamyachenkov; Stanislav Naboichenko. 2021. "Pressure Oxidation of Arsenic (III) Ions in the H3AsO3-Fe2+-Cu2+-H2SO4 System." Metals 11, no. 6: 975.

Journal article
Published: 28 May 2021 in Metals
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At present, the processing of refractory gold–arsenic sulphide concentrates is becoming more relevant due to the depletion of rich crude ore reserves. In the process of the nitric acid leaching of arsenic sulphide minerals, solutions are formed containing 20–30 g/L of arsenic (III). Since market demand for arsenic compounds is limited, such solutions are traditionally converted into poorly soluble compounds. This paper describes the investigation of precipitating arsenic sulphide from nitric acid leaching solutions of refractory sulphide raw materials of nonferrous metals containing iron (III) ions using sodium hydrosulphide with a molar ratio of NaHS/As = 2.4–2.6, which is typical for pure model solutions without oxidants. The work studied the effect of temperature, the pH of the solution and the consumption of NaHS and seed crystal on this process. The highest degree of precipitation of arsenic (III) sulphide (95–99%) from nitric acid leaching solutions containing iron (III) ions without seed occurs with a pH from 1.8 to 2.0 and a NaHS/As molar ratio of 2.8. The introduction of seed crystal significantly improves the precipitation of arsenic (III) sulphide. An increase in seed crystal consumption from 0 to 34 g/L in solution promotes an increase in the degree of transition of arsenic to sediment from 36.2 to 98.1% at pH = 1. According to SEM/EDS and XRF sediment data, from the results of experiments on the effect of As2S3 seed crystal consumption, acidity and molar ratio of NaHS/As on the precipitation of arsenic (III) sulphide and the Fetotal/Fe2+ ratio in the final solution, it can be concluded that the addition of a seed accelerates the crystallisation of arsenic (III) sulphide by increasing the number of crystallisation centres; as a result, the deposition rate of As2S3 becomes higher. Since the oxidation rate of sulphide ions to elemental sulphur by iron (III) ions does not change significantly, the molar ratio of NaHS/As can be reduced to 2.25 to obtain a precipitate having a lower amount of elemental sulphur and a high arsenic content similar to that precipitated from pure model solutions.

ACS Style

Kirill Karimov; Denis Rogozhnikov; Evgeniy Kuzas; Oleg Dizer; Dmitry Golovkin; Maksim Tretiak. Deposition of Arsenic from Nitric Acid Leaching Solutions of Gold–Arsenic Sulphide Concentrates. Metals 2021, 11, 889 .

AMA Style

Kirill Karimov, Denis Rogozhnikov, Evgeniy Kuzas, Oleg Dizer, Dmitry Golovkin, Maksim Tretiak. Deposition of Arsenic from Nitric Acid Leaching Solutions of Gold–Arsenic Sulphide Concentrates. Metals. 2021; 11 (6):889.

Chicago/Turabian Style

Kirill Karimov; Denis Rogozhnikov; Evgeniy Kuzas; Oleg Dizer; Dmitry Golovkin; Maksim Tretiak. 2021. "Deposition of Arsenic from Nitric Acid Leaching Solutions of Gold–Arsenic Sulphide Concentrates." Metals 11, no. 6: 889.

Journal article
Published: 18 June 2020 in Metals
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Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing minerals on the kinetics of Cu and Ag leaching from low-grade copper concentrates. The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium-carbonate solution with oxygen as an oxidizing agent are in good agreement with the shrinking core model in the intra-diffusion mode: in this case, the activation energies were 53.50 kJ/mol for Cu and 90.35 kJ/mol for Ag. Energy-dispersive X-ray spectroscopy analysis (EDX) analysis showed that reagent diffusion to Cu-bearing minerals can be limited by aluminosilicate minerals of the gangue. The recovery rate for copper and silver increases significantly after a preliminary alkaline desilication of the concentrate, and the new shrinking core model is the most adequate, showing that the process is limited by diffusion through the product layer and interfacial diffusion. The activation energy of the process increases to 86.76 kJ/mol for Cu and 92.15 kJ/mol for Ag. Using the time-to-a-given-fraction method, it has been shown that a high activation energy is required in the later stages of the process, when the most resistant sulfide minerals of copper and silver apparently remain.

ACS Style

Kirill Karimov; Andrei Shoppert; Denis Rogozhnikov; Evgeniy Kuzas; Semen Zakhar’Yan; Stanislav Naboichenko. Effect of Preliminary Alkali Desilication on Ammonia Pressure Leaching of Low-Grade Copper–Silver Concentrate. Metals 2020, 10, 812 .

AMA Style

Kirill Karimov, Andrei Shoppert, Denis Rogozhnikov, Evgeniy Kuzas, Semen Zakhar’Yan, Stanislav Naboichenko. Effect of Preliminary Alkali Desilication on Ammonia Pressure Leaching of Low-Grade Copper–Silver Concentrate. Metals. 2020; 10 (6):812.

Chicago/Turabian Style

Kirill Karimov; Andrei Shoppert; Denis Rogozhnikov; Evgeniy Kuzas; Semen Zakhar’Yan; Stanislav Naboichenko. 2020. "Effect of Preliminary Alkali Desilication on Ammonia Pressure Leaching of Low-Grade Copper–Silver Concentrate." Metals 10, no. 6: 812.

Journal article
Published: 01 May 2020 in Materials Science Forum
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Monometallic ore that is mostly lead found in nature is extremely rare. The main natural raw material for the lead production is sulfide polymetallic ores. In this study the filter cake processing after the low-temperature autoclave leaching of the lead concentrate to produce a sulphide concentrate and lead tailings was investigated The study of component separation was carried out using the methods of mathematical planning of the second order experiment. The following optimal costs of reagents, g/t: 140-200 potassium xanthate, 70-100 foaming agent, 100 copper sulfate; the concentrate yield is 41-43 %; it is extracted to, %: 95 Fe, 49 Cu, 96 Zn, 98 S0, 18-19 Pb. At flotation 18,7% of lead goes into flotation concentrate and 80.5% is lead sulfate. The rectification of the obtained concentrate by flotation did not give acceptable results, since the yield of the foam product in all experiments was 93-96%. For the separation of lead sulphate from sulphur-sulfide concentrate was used in the granulation of sulfur in the following conditions: t = 145 °C, Po2 = 0,0-0,5 MPa, τ = 60 to 120 min. In the granulation process of the flotation concentrate is a division of lead sulfate and elemental sulfur, the sulfate lead content in sulphur-sulfide phase is decreased from 28.44 % to 3.5 %, its recovery in a sulfate filter cake has reached 90.6 %

ACS Style

Kirill Karimov; Aleksei V. Kritskii; Sergey E. Polygalov. Investigation of Flotation Separation of Elemental Sulfur and Sulfides from Lead Sulfate from Low-Temperature Leaching of Lead Concentrates. Materials Science Forum 2020, 989, 537 -542.

AMA Style

Kirill Karimov, Aleksei V. Kritskii, Sergey E. Polygalov. Investigation of Flotation Separation of Elemental Sulfur and Sulfides from Lead Sulfate from Low-Temperature Leaching of Lead Concentrates. Materials Science Forum. 2020; 989 ():537-542.

Chicago/Turabian Style

Kirill Karimov; Aleksei V. Kritskii; Sergey E. Polygalov. 2020. "Investigation of Flotation Separation of Elemental Sulfur and Sulfides from Lead Sulfate from Low-Temperature Leaching of Lead Concentrates." Materials Science Forum 989, no. : 537-542.

Journal article
Published: 01 January 2020 in Solid State Phenomena
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Ural enrichment plants processing copper-porphyry deposits are produced chalcopyrite concentrates of the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.59 S, 24.52 Fe, 0.05 Pb, 0.04 Ni, 16.28 SiO2 [1]. According to previous studies [2, 3, 21], such concentrates can be effectively treated using pressure oxidative leaching (POX). At temperature of 190–200 °C, partial oxygen pressure 4–6 bar and [H2SO4] = 15–30 g / L during 100-120 min about 98 % Cu was extracted. In this paper, an inluence of chalcopyrite concentrate preliminary grinding on efficiency of the POX stage was studied. It was found that even the finest grinding of the particle size class P80 = 13 μm does not lead to significant intensification of process kinetics.

ACS Style

Aleksei Kritskii; Kirill Karimov; Stanislav Naboichenko. Pressure Leaching of Chalcopyrite Concentrate: Ultra-Fine Milling as Process Acceleration Method. Solid State Phenomena 2020, 299, 1109 -1114.

AMA Style

Aleksei Kritskii, Kirill Karimov, Stanislav Naboichenko. Pressure Leaching of Chalcopyrite Concentrate: Ultra-Fine Milling as Process Acceleration Method. Solid State Phenomena. 2020; 299 ():1109-1114.

Chicago/Turabian Style

Aleksei Kritskii; Kirill Karimov; Stanislav Naboichenko. 2020. "Pressure Leaching of Chalcopyrite Concentrate: Ultra-Fine Milling as Process Acceleration Method." Solid State Phenomena 299, no. : 1109-1114.

Journal article
Published: 01 January 2020 in Solid State Phenomena
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Autoclave oxidative leaching is one of the most promising hydrometallurgical approaches for copper suplhide materials processing. In previous studies [2–4], the possibility of an efficient autoclave treatment of chalcopyrite concentrate was confirmed. The concentrate has the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.5 S, 24.5 Fe, 0.05 Pb, 0.04 Ni, 16.2 SiO2 [1]. At high temperature conditions (190–200 °C; 4–6 bar) in sulfuric-acid media during 100–120 min about 98% Cu was extracted. A leaching residue after POX (POX-cake) contained the following compounds, %: 55 Fe2O3, 40 SiO2, 4 MeS2/MeS. Current paper presents the results on purification of POX-cakes from iron by autoclave treatment. Futher ways for by-products (SiO2-cake and FeSO4-solution) processing are sugested.

ACS Style

Aleksei Kritskii; Kirill Karimov; Stanislav Naboichenko. Pressure Leaching of Chalcopyrite Concentrate: Iron Removal from Leaching Residues. Solid State Phenomena 2020, 299, 1052 -1057.

AMA Style

Aleksei Kritskii, Kirill Karimov, Stanislav Naboichenko. Pressure Leaching of Chalcopyrite Concentrate: Iron Removal from Leaching Residues. Solid State Phenomena. 2020; 299 ():1052-1057.

Chicago/Turabian Style

Aleksei Kritskii; Kirill Karimov; Stanislav Naboichenko. 2020. "Pressure Leaching of Chalcopyrite Concentrate: Iron Removal from Leaching Residues." Solid State Phenomena 299, no. : 1052-1057.

Journal article
Published: 19 December 2019 in Metals
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The overall decrease in the quality of mineral raw materials, combined with the use of arsenic-containing ores, results in large amounts of various intermediate products containing this highly toxic element. The use of hydrometallurgical technologies for these materials is complicated by the formation of multicomponent solutions and the difficulty of separating copper from arsenic. Previously, for the selective separation of As from copper–arsenic intermediates a leaching method in the presence of Cu(II) ions was proposed. This paper describes the investigation of the kinetics of arsenic sulfide-containing materials leaching by copper sulfate solution. The cakes after leaching of arsenic trisulfide with a solution of copper sulfate were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDS). The effect of temperature (70–90 °C), the initial concentration of CuSO4 (0.23–0.28 M) and the time on the As recovery into the solution was studied. The process temperature has the greatest effect on the kinetics, while an increase in copper concentration from 0.23 to 0.28 M effects an increase in As transfer into solution from 93.2% to 97.8% for 120 min of leaching. However, the shrinking core model that best fits the kinetic data suggests that the process occurs by the intra-diffusion mode with the average activation energy of 44.9 kJ/mol. Using the time-to-a-given-fraction kinetics analysis, it was determined that the leaching mechanism does not change during the reaction. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X) − 1/3 − 1] = 4560000Cu3.61e−44900/RT t.

ACS Style

Kirill A. Karimov; Denis A. Rogozhnikov; Evgeniy A. Kuzas; Andrei A. Shoppert. Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution. Metals 2019, 10, 7 .

AMA Style

Kirill A. Karimov, Denis A. Rogozhnikov, Evgeniy A. Kuzas, Andrei A. Shoppert. Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution. Metals. 2019; 10 (1):7.

Chicago/Turabian Style

Kirill A. Karimov; Denis A. Rogozhnikov; Evgeniy A. Kuzas; Andrei A. Shoppert. 2019. "Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution." Metals 10, no. 1: 7.

Journal article
Published: 30 August 2019 in Tsvetnye Metally
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ACS Style

S. S. Naboychenko; Kirill Karimov; S. A. Yakornov; S. A. Zagrebin; Verkhnaya Pyshma Ummc-Holding. Pressure Leaching of Lead Concentrate Produced by Siberia Polymetals. Tsvetnye Metally 2019, 30 -35.

AMA Style

S. S. Naboychenko, Kirill Karimov, S. A. Yakornov, S. A. Zagrebin, Verkhnaya Pyshma Ummc-Holding. Pressure Leaching of Lead Concentrate Produced by Siberia Polymetals. Tsvetnye Metally. 2019; ():30-35.

Chicago/Turabian Style

S. S. Naboychenko; Kirill Karimov; S. A. Yakornov; S. A. Zagrebin; Verkhnaya Pyshma Ummc-Holding. 2019. "Pressure Leaching of Lead Concentrate Produced by Siberia Polymetals." Tsvetnye Metally , no. : 30-35.

Journal article
Published: 22 April 2019 in Metals
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The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO3 leaching of sulfide gold-containing concentrates of the Yenisei ridge (Yakutia, Russia). The effect of temperature (70–85 °C), the initial concentration of HNO3 (10–40%) and the content of sulfur in the concentrate (8.22–22.44%) on the iron recovery into the solution was studied. It has been shown that increasing the content of S in the concentrate from 8.22 to 22.44% leads to an average of 45% increase in the iron recovery across the entire range temperatures and concentrations of HNO3 per one hour of leaching. The leaching kinetics of the studied types of concentrates correlates well with the new shrinking core model, which indicates that the reaction is regulated by interfacial diffusion and diffusion through the product layer. Elemental S is found on the surface of the solid leach residue, as confirmed by XRD and SEM/EDS analysis. The apparent activation energy is 60.276 kJ/mol. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X)−1/3 − 1] = 87.811(HNO3)0.837(S)2.948e−60276/RT·t.

ACS Style

Denis A. Rogozhnikov; Andrei A. Shoppert; Oleg Dizer; Kirill A. Karimov; Rostislav E. Rusalev. Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid. Metals 2019, 9, 465 .

AMA Style

Denis A. Rogozhnikov, Andrei A. Shoppert, Oleg Dizer, Kirill A. Karimov, Rostislav E. Rusalev. Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid. Metals. 2019; 9 (4):465.

Chicago/Turabian Style

Denis A. Rogozhnikov; Andrei A. Shoppert; Oleg Dizer; Kirill A. Karimov; Rostislav E. Rusalev. 2019. "Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid." Metals 9, no. 4: 465.

Article
Published: 13 March 2019 in Metallurgist
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Lead, zinc, and arsenic are associated elements in copper ores. Due to deterioration of concentrate quality and involvement in recycling of secondary raw materials, these impurities are increasingly circulated in copper-smelting production, most often collected in fine dusts. Recovery of these dusts for pyrometallurgical processing leads to contamination of black copper with arsenic and lead. Results are provided for sulfuric acid autoclave leaching of OAO SUMZ dust and dust obtained after recovery melting, containing alongside copper and zinc considerable amounts of lead and arsenic. The effect of temperature and acid concentration on autoclave leaching indices is studied. Optimum dust leaching parameters are obtained: temperature 160°C, H2SO4 /(Pb+Zn+Cu) = 2.1, \( {P}_{{\mathrm{O}}_2}=0.3\mathrm{MPa} \), τ = 2 h, and with these parameters the maximum degree of leaching for arsenic, copper and zinc is observed. Direct oxidizing sulfuric autoclave leaching of fine dust makes it possible to extract up to 89% copper and 92% zinc. Arsenic passes into a cake in the form of iron arsenate, which complicates subsequent processing. In order to exclude deposition of arsenic during autoclave leaching it is necessary to remove arsenic from dust where it is present in the form of oxidized compounds, and therefore it is possible to use atmospheric sulfuric acid leaching for its extraction. During two stages of atmospheric and autoclave oxidation leaching, it is possible to extract up to 93% Cu, 96% Zn, and 99% As.

ACS Style

K. A. Karimov; S. S. Naboichenko; A. V. Kritskii; M. A. Tret’Yak; A. A. Kovyazin. Oxidation Sulfuric Acid Autoclave Leaching of Copper Smelting Production Fine Dust. Metallurgist 2019, 62, 1244 -1249.

AMA Style

K. A. Karimov, S. S. Naboichenko, A. V. Kritskii, M. A. Tret’Yak, A. A. Kovyazin. Oxidation Sulfuric Acid Autoclave Leaching of Copper Smelting Production Fine Dust. Metallurgist. 2019; 62 (11-12):1244-1249.

Chicago/Turabian Style

K. A. Karimov; S. S. Naboichenko; A. V. Kritskii; M. A. Tret’Yak; A. A. Kovyazin. 2019. "Oxidation Sulfuric Acid Autoclave Leaching of Copper Smelting Production Fine Dust." Metallurgist 62, no. 11-12: 1244-1249.

Journal article
Published: 01 February 2019 in Materials Science Forum
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This article presents a study of Tomtor rare earth ore decomposition. This material contains a lot of valuable components such as REE and niobium (mas., %: 12,8 ΣREO (rare earth oxides), 0.039 Sc, 18.4 P2O5, 9.9 Fe, 9.0 Al, 0.24 ThO2, 8.2 Nb2O5). The study aims to find efficient ways of processing this deposit. Technologies using the sulfuric acid as the main reagent to leach are described in this article. Investigation has three trends. The first trend is agitation leaching at low sulfuric acid concentrations, temperatures up to 95 °C and atmospheric pressure. The second trend is pressure leaching at low sulfuric acid concentrations, high temperatures (up to 180 °C) and high pressure. The third trend is high temperature sulfatization with concentrated sulfuric acid at elevated temperature (up to 180 °C) and atmospheric pressure followed by aqueous leaching. The dependence of target components (rare earth elements, scandium, phosphorus) and the impurity (iron, aluminum, thorium) extractions into solution from major factors was studied.

ACS Style

K.D. Naumov; Kirill Karimov; Alexander Klyushnikov. Complex Rare Earth Minerals Sulfate Decomposition Techniques Investigation. Materials Science Forum 2019, 946, 580 -584.

AMA Style

K.D. Naumov, Kirill Karimov, Alexander Klyushnikov. Complex Rare Earth Minerals Sulfate Decomposition Techniques Investigation. Materials Science Forum. 2019; 946 ():580-584.

Chicago/Turabian Style

K.D. Naumov; Kirill Karimov; Alexander Klyushnikov. 2019. "Complex Rare Earth Minerals Sulfate Decomposition Techniques Investigation." Materials Science Forum 946, no. : 580-584.

Journal article
Published: 20 January 2019 in Minerals
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This study investigates the use of red muds as adsorbents for As (V) removal. Red mud is a waste that contains a large amount of iron oxides and hydroxides, which are excellent adsorbents of arsenic, especially those possessing magnetic properties and a large specific surface area. The purpose of the experiments was to study the possibility of obtaining an effective adsorbent by the direct extraction of alumina from bauxite using the caustic alkali fusion method and to compare the arsenic removal effectiveness and other properties of these red muds with industrial samples. Red muds were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), SEM, vibrating sample magnetometry (VSM), and the Brunauer–Emmett–Teller (BET) method. The main iron-containing phase of the red muds obtained by fusing bauxite with caustic alkali is maghemite, which has a large specific surface area. The specific surface area of the obtained samples varied in the range of 6.1–54.9 m2/g. Arsenic adsorption experiments were carried out using five different types of red muds: industrial Bayer, industrial sintering, and red mud obtained through bauxite alkali fusion at 300, 500, and 700 °C. The red muds obtained by fusing bauxite with caustic alkali at 300 and 500 °C had the highest effectiveness removing arsenic; their As(V) uptake capacity was over 30 mg/g.

ACS Style

Andrei A. Shoppert; Irina V. Loginova; Denis A. Rogozhnikov; Kirill A. Karimov; Leonid I. Chaikin. Increased As Adsorption on Maghemite-Containing Red Mud Prepared by the Alkali Fusion-Leaching Method. Minerals 2019, 9, 60 .

AMA Style

Andrei A. Shoppert, Irina V. Loginova, Denis A. Rogozhnikov, Kirill A. Karimov, Leonid I. Chaikin. Increased As Adsorption on Maghemite-Containing Red Mud Prepared by the Alkali Fusion-Leaching Method. Minerals. 2019; 9 (1):60.

Chicago/Turabian Style

Andrei A. Shoppert; Irina V. Loginova; Denis A. Rogozhnikov; Kirill A. Karimov; Leonid I. Chaikin. 2019. "Increased As Adsorption on Maghemite-Containing Red Mud Prepared by the Alkali Fusion-Leaching Method." Minerals 9, no. 1: 60.

Article
Published: 15 November 2018 in Metallurgist
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Autoclave ammonia leaching of silver from low-grade copper concentrates is studied with use of Zhezkazgan concentrates of the following composition, %: 9.55 Cu, Fe 4.84, S 5.6, 27.03 Si, 109.6 g/ton Ag. According to X-ray phase analysis the main minerals present in the concentrate are, %: 29 quartz (SiO2 ), 33 plagioclase ((Ca, Na)(Al, Si)AlSi2O6 ), 16 mica, 10 chalcocite (Cu2S), 2 chalcopyrite (CuFeS2 ), and 7 pyrite (FeS2 ). It is shown that during ore processing in which gold and silver are in close association with sulfide minerals, precious metals are not extracted by cyaniding even after ultrafine grinding. The proportion of such persistent raw materials is more than 30% of the total ore reserves containing precious metals in the world. Use of the most common technologies of autoclave sulphuric acid and neutral leaching for quantitative oxidation of gold and silver containing sulphides in this case is limited due to the formation of argentojarosite, inert with respect to the cyanide ion. In order to avoid its formation and to increase the degree of leaching silver directly at the autoclave stage, its extraction in ammonia is investigated. With direct autoclave leaching copper extraction into solution is 93–97%, while silver extraction is not observed in some experiments, which may be due to the sorption activity of aluminum and silicon compounds present in the concentrate. Preliminary mechanical activation and surface resynthesis have a favorable effect on recovery rates of copper and silver in solution. An additional operation of concentrate silica removal provides extraction of 97% copper and 83% silver into solution with [NH4OH] = 7 mole/dm3, L:S = 10:1, τ = 3 h, pO2 = 0.6 MPa, t = 140°С.

ACS Style

K. A. Karimov; Denis Rogozhnikov; S. S. Naboichenko; L. M. Karimova; S. V. Zakhar’Yan. Autoclave Ammonia Leaching of Silver from Low-Grade Copper Concentrates. Metallurgist 2018, 62, 783 -789.

AMA Style

K. A. Karimov, Denis Rogozhnikov, S. S. Naboichenko, L. M. Karimova, S. V. Zakhar’Yan. Autoclave Ammonia Leaching of Silver from Low-Grade Copper Concentrates. Metallurgist. 2018; 62 (7-8):783-789.

Chicago/Turabian Style

K. A. Karimov; Denis Rogozhnikov; S. S. Naboichenko; L. M. Karimova; S. V. Zakhar’Yan. 2018. "Autoclave Ammonia Leaching of Silver from Low-Grade Copper Concentrates." Metallurgist 62, no. 7-8: 783-789.

Journal article
Published: 31 October 2018 in Tsvetnye Metally
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ACS Style

L. G. Elfimova; Kirill Karimov; A. V. Kritskiy; S. S. Naboychenko. Pressure leaching of copper-nickel converter matte in sulfuric acid media. Tsvetnye Metally 2018, 24 -28.

AMA Style

L. G. Elfimova, Kirill Karimov, A. V. Kritskiy, S. S. Naboychenko. Pressure leaching of copper-nickel converter matte in sulfuric acid media. Tsvetnye Metally. 2018; ():24-28.

Chicago/Turabian Style

L. G. Elfimova; Kirill Karimov; A. V. Kritskiy; S. S. Naboychenko. 2018. "Pressure leaching of copper-nickel converter matte in sulfuric acid media." Tsvetnye Metally , no. : 24-28.

Chapter
Published: 08 May 2018 in Improving Road Pavement Characteristics
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Lead, zinc, and arsenic circulate in the intermediate products of metallurgy enterprises because of the bad quality of the concentrates used and the inclusion of secondary raw materials into the process. These intermediate products are mainly represented by dusts. Recycling of these dusts in smelting aggregates leads to the contamination of blister copper with arsenic and lead. This chapter presents some results of oxidizing sulfuric acid pressure leaching and leaching with copper sulfate solution of mattes obtained from the joint reduction smelting of these dusts. The option of cake treatment after pressure leaching with a copper sulfate solution is shown here. The oxidizing sulfuric acid pressure leaching is carried out in the temperature range of 140–180 °С, acidity range of 10–80 g/dm3, and pressure of 0.4 MPa that allow one to extract 94.2% of copper into the solution. Iron, arsenic, and lead remain in the cake after leaching even after the repeated leaching. This fact makes it difficult to process the cake at the lead enterprises by a conventional technology. The pressure leaching with a copper sulfate solution of mattes is proposed as an alternative to the oxidizing sulfuric acid pressure leaching. This leaching allows one to extract up to 93% of arsenic, zinc, and iron into the solution in the temperature range of 140–180 °С. The cake after pressure leaching with copper sulfate solution may be subjected to the oxidizing sulfuric acid pressure leaching to obtain a lead cake which may be used at lead plants. There is a scheme of processing of mattes including the pressure leaching with a copper sulfate solution as one of the basic operations followed by the oxidizing sulfuric acid pressure leaching.

ACS Style

K. A. Karimov; S. S. Naboychenko; V. I. Neustroev; V. A. Menshchikov. High-Pressure Leaching Arsenic Containing Polymetallic Copper Mattes. Improving Road Pavement Characteristics 2018, 51 -57.

AMA Style

K. A. Karimov, S. S. Naboychenko, V. I. Neustroev, V. A. Menshchikov. High-Pressure Leaching Arsenic Containing Polymetallic Copper Mattes. Improving Road Pavement Characteristics. 2018; ():51-57.

Chicago/Turabian Style

K. A. Karimov; S. S. Naboychenko; V. I. Neustroev; V. A. Menshchikov. 2018. "High-Pressure Leaching Arsenic Containing Polymetallic Copper Mattes." Improving Road Pavement Characteristics , no. : 51-57.

Conference paper
Published: 01 January 2018 in PROCEEDINGS OF THE INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2017): Metallurgy and Advanced Material Technology for Sustainable Development
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The results of chalcopyrite concentrate processing using low-temperature and high-temperature sulfuric acid pressure leaching are presented. A material of the following composition was used, 21.5 Cu, 0.1 Zn, 0.05 Pb, 0.04 Ni, 26.59 S, 24.52 Fe, 16.28 SiO2 (in wt.%). The influence of technological parameters on the degree of copper and iron extraction into the leach solution was studied in the wide range of values. The following conditions were suggested as the optimal for the high-temperature pressure leaching: t = 190 °C, PO2 = 0.5 MPa, CH2SO4 = 15 g/L, L:S = 6:1. At the mentioned parameters, it is possible to extract at least 98% Cu from concentrate into the leaching solution during 100 minutes. The following conditions were suggested as optimal for the low-temperature pressure leaching: t = 105 °C, PO2 = 1.3-1.5 MPa, CH2SO4 = 90 g/L, L:S = 10:1. At the mentioned parameters, it is possible to extract up to 83% Cu from the concentrate into the leach solution during 300-360 minutes.

ACS Style

Kritskii Aleksei; Karimov Kirill; Naboichenko Stanislav. Pressure leaching of chalcopyrite concentrate. PROCEEDINGS OF THE INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2017): Metallurgy and Advanced Material Technology for Sustainable Development 2018, 1964, 020048 .

AMA Style

Kritskii Aleksei, Karimov Kirill, Naboichenko Stanislav. Pressure leaching of chalcopyrite concentrate. PROCEEDINGS OF THE INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2017): Metallurgy and Advanced Material Technology for Sustainable Development. 2018; 1964 (1):020048.

Chicago/Turabian Style

Kritskii Aleksei; Karimov Kirill; Naboichenko Stanislav. 2018. "Pressure leaching of chalcopyrite concentrate." PROCEEDINGS OF THE INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2017): Metallurgy and Advanced Material Technology for Sustainable Development 1964, no. 1: 020048.

Journal article
Published: 03 September 2017 in KnE Materials Science
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Zinc concentrates processing technology that includes high-temperature roasting – leaching of cinder – purification of leached liquor – electrowinning is the most widely used technology. Purified solution, which is fed to the electrowinning stage, has a high sensitivity to such an impurity as iron. The presence of iron in the zinc electrolyte has a negative influence both on the current efficiency and the quality of the cathode zinc. The application of autoclave equipment for iron removal from zinc sulfate solutions, obtained after the leaching stage of zinc cinder, is described in this article. All experiments were carried out with a model solution of following composition, g/L: 10-33 H2SO4, 1.5 Cu, 5 Mn, 110 Zn, 2.5 Fe. Neutralization and purification of the solution was implemented during low-temperature pressure leaching of the zinc cinder. The optimum conditions for iron precipitation from zinc solution are following: molar flow rate Zn(cinder) / H2SO4 = 1.3, t = 80 °C, τ = 1 hour, PO2 = 0.2 MPa. It was found, that the concentration of iron can be reduced up to 1-2 mg/L, whereas 83.5% of Zn and 52.1% of Cu being recovered into the solution from zinc cinder.

ACS Style

K.A. Karimov; A.V. Kritskii; S.S. Naboichenko; O.B. Kolmachikhina; D.A. Rogozhnikov. Autoclave Precipitation Of Iron From Zinc Sulfate Solutions. KnE Materials Science 2017, 2, 76 .

AMA Style

K.A. Karimov, A.V. Kritskii, S.S. Naboichenko, O.B. Kolmachikhina, D.A. Rogozhnikov. Autoclave Precipitation Of Iron From Zinc Sulfate Solutions. KnE Materials Science. 2017; 2 (2):76.

Chicago/Turabian Style

K.A. Karimov; A.V. Kritskii; S.S. Naboichenko; O.B. Kolmachikhina; D.A. Rogozhnikov. 2017. "Autoclave Precipitation Of Iron From Zinc Sulfate Solutions." KnE Materials Science 2, no. 2: 76.

Article
Published: 01 July 2017 in Metallurgist
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During treatment of copper-cobalt ores with a high nickel content of one of the domestic deposits by standard technology, it is expected to obtain converter matte containing, wt.%: 60–68 Ni, 7–9 Cu, 4–6 Fe, 2–3 Co, 21–23 S. It has been established for a model sample (wt. %: 62 Ni, 7.1 Cu, 3.7 Fe, 2.2 Co, 18 S) that processing converter matte under conditions of increased oxygen pressure is much more effective than under atmospheric conditions, and this is indicated by a reduction in the duration of pressure leaching (1.3–1.5 h) compared with leaching under atmospheric conditions (4–8 h), and also indices for extraction of economic components into solution (wt. %: 67 Ni, 99 Cu, 99 Fe). Due to the use of special experiment planning programs, a more complete study is achieved for the effect of oxygen pressure and temperature on leaching nickel, and also determination of the most effective production parameters for performing the process. In view of the low copper content, flotation separation of this converter matte is ineffective. Separation of copper and nickel is accomplished by selective pressure leaching of nickel from converter matte. It is established that as a result of selective leaching of nickel from copper-nickel converter matte the initial acid concentration has a considerable effect. It is possible to extract nickel into solution at the level of 50–55% and copper and iron are concentrated in cake (concentration in final solution is mg/dm3: 0.06 Cu and 0.62 Fe). A method is proposed for processing leaching products.

ACS Style

K. A. Karimov; A. V. Kritskii; L. G. Elfimova; Stanislav Naboichenko. Low-Temperature Pressure Leaching of Converter Matte in Sulfuric Acid Solutions. Metallurgist 2017, 61, 238 -242.

AMA Style

K. A. Karimov, A. V. Kritskii, L. G. Elfimova, Stanislav Naboichenko. Low-Temperature Pressure Leaching of Converter Matte in Sulfuric Acid Solutions. Metallurgist. 2017; 61 (3-4):238-242.

Chicago/Turabian Style

K. A. Karimov; A. V. Kritskii; L. G. Elfimova; Stanislav Naboichenko. 2017. "Low-Temperature Pressure Leaching of Converter Matte in Sulfuric Acid Solutions." Metallurgist 61, no. 3-4: 238-242.

Journal article
Published: 21 July 2016 in Metallurgist
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In connection with the deterioration in the quality of the concentrates that are now being produced and the use of recycled raw materials, lead, zinc, and arsenic are circulating in the semifinished products obtained during copper production and usually accumulate in the system in the form of dust. This article discusses results obtained from the sulfuric acid leaching of dust that is left from reduction smelting at the Middle Ural Copper Smelter. In addition to copper and zinc, the dust contains substantial amounts of lead and arsenic (up to 30%). The computer program Statgraphics was used to plan experiments and analyze the results. The effect of temperature and acid concentration on the indices of the leaching operation was studied and it was determined that for the given process parameters arsenic and copper extraction are most affected by the initial acidity of the solution and zinc extraction is most affected by the temperature of the process. The optimum parameters for leaching the dust were determined: temperature – 60°C; initial acid concentration – 25 g/dm3. Performing the leaching operation with these parameters maximizes the yields of arsenic, copper, and zinc (98% As, 39% Cu, 82% Zn), but raising the temperature and initial acid concentration further has almost no effect on these yields.

ACS Style

K. A. Karimov; S. S. Naboichenko. Sulfuric Acid Leaching of High-Arsenic Dust from Copper Smelting. Metallurgist 2016, 60, 456 -459.

AMA Style

K. A. Karimov, S. S. Naboichenko. Sulfuric Acid Leaching of High-Arsenic Dust from Copper Smelting. Metallurgist. 2016; 60 (3-4):456-459.

Chicago/Turabian Style

K. A. Karimov; S. S. Naboichenko. 2016. "Sulfuric Acid Leaching of High-Arsenic Dust from Copper Smelting." Metallurgist 60, no. 3-4: 456-459.

Journal article
Published: 01 January 2016 in Russian Journal of Non-Ferrous Metals
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The topicality is shown to improve the processing technology of complex polymetallic raw material containing a considerable amount of toxic impurities of arsenic and lead. Results on pressure leaching the mattes formed after reduction smelting the dusts of OAO Sredneural’skii Copper Smeltery (SUMZ) by solutions of copper sulfate are discussed. These mattes contain a considerable amount of lead and arsenic. According to the data of X-ray phase analysis of matte samples, phases of sulfides (PbS, PbS ⋅ As2S3, Cu2S, FeS, and (Zn,Fe)S) and arsenides (FeAs2, Cu3As, FeAs, and Cu0.85As0.15), as well as inclusions of metallic copper, are revealed in them. Optimal parameters of matte leaching by copper sulfate solutions are the temperature of 150–180°C, acidity from 5 to 30 g/dm3, and copper concentration of 14–32 g/dm3. This process made it possible to extract 85% As into the solution, while copper and lead remained in the cake in this case.

ACS Style

K. A. Karimov; S. S. Naboichenko; V. I. Neustroev. Pressure leaching of copper arsenic-containing mattes with copper sulfate solutions. Russian Journal of Non-Ferrous Metals 2016, 57, 1 -6.

AMA Style

K. A. Karimov, S. S. Naboichenko, V. I. Neustroev. Pressure leaching of copper arsenic-containing mattes with copper sulfate solutions. Russian Journal of Non-Ferrous Metals. 2016; 57 (1):1-6.

Chicago/Turabian Style

K. A. Karimov; S. S. Naboichenko; V. I. Neustroev. 2016. "Pressure leaching of copper arsenic-containing mattes with copper sulfate solutions." Russian Journal of Non-Ferrous Metals 57, no. 1: 1-6.