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Dr. Dmitry Valeev
A.A.Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences

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0 Alumina
0 Autoclave
0 Bauxite
0 Coagulation
0 Fly Ash

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Leaching
Bauxite
Fly Ash
hydrochloric acid
Alumina
Autoclave
Red mud

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Journal article
Published: 12 February 2021 in Metals
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Research into the solvent extraction of iron(III) from a chloride solution after bauxite HCl leaching by neutral oxygen-containing extractants and their mixtures were studied and the iron(III) extraction degree from chloride solutions using alcohols is presented. The effect of dilution of alcohol with a ketone by an extraction mixture in relation to its effectiveness was investigated. The iron(III) was efficiently extracted by the mixture of 1-octanol and 1-decanol (70%) with 2-undecanone (30%) from hydrochloric bauxite leach liquor at an O:A ratio = 2-4:1 at an iron(III) concentration of 7.4 g/L and 6 M HCl. For the removal of iron-containing organic phase from impurities (Al, Ca, Cr) that are co-extracted with iron(III), we used two step scrubbing at O:A = 5:1 by 7 M HCl as a scrub solution. The iron(III) stripping at the O:A ratio is shown. Using counter-current cascade of extractors, it was possible to obtain an FeCl3 solution with the iron(III) content of 90.5 g/L and total impurities less than 50 mg/L.

ACS Style

Artem Sokolov; Dmitry Valeev; Aleksandr Kasikov. Solvent Extraction of Iron(III) from Al Chloride Solution of Bauxite HCl Leaching by Mixture of Aliphatic Alcohol and Ketone. Metals 2021, 11, 321 .

AMA Style

Artem Sokolov, Dmitry Valeev, Aleksandr Kasikov. Solvent Extraction of Iron(III) from Al Chloride Solution of Bauxite HCl Leaching by Mixture of Aliphatic Alcohol and Ketone. Metals. 2021; 11 (2):321.

Chicago/Turabian Style

Artem Sokolov; Dmitry Valeev; Aleksandr Kasikov. 2021. "Solvent Extraction of Iron(III) from Al Chloride Solution of Bauxite HCl Leaching by Mixture of Aliphatic Alcohol and Ketone." Metals 11, no. 2: 321.

Journal article
Published: 16 December 2020 in Metals
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One of the potential sources of alumina and mesoporous silica is the coal-fired thermal plants waste known as the coal fly ash (CFA). The studies of the alumina extraction from CFA are often focused on the preliminary desilication, but the efficiency of the alkali desilication is low due to formation of the desilication product—Na6[Al6Si6O24]·Na2X (DSP). This research is focused on the possibility of CFA desilication without formation of DSP using a leaching process with higher liquid to solid ratios (L/S) and alkali concentrations. The experimental data were analyzed using an artificial neural network (ANN) machine learning method and a shrinking core model (SCM). The investigation of the CFA morphology, chemical and phase composition before and after leaching were carried out by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), inductively coupled plasma optical emission spectrometry (ICP-OES) and X-ray diffraction (XRD). The present work shows that it is possible to avoid formation of DSP if using the L/S ratio >20 and concentration of Na2O—400 g/L during CFA leaching. The kinetics analysis by SCM showed that the process is limited by the surface chemical reaction at T 100 °C, respectively. The SEM images of the solid residue after NaOH leaching under conditions that prevent the DSP formation show mullite particles with an acicular structure.

ACS Style

Andrei Shoppert; Dmitry Valeev; Irina Loginova; Leonid Chaikin. Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure. Metals 2020, 10, 1684 .

AMA Style

Andrei Shoppert, Dmitry Valeev, Irina Loginova, Leonid Chaikin. Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure. Metals. 2020; 10 (12):1684.

Chicago/Turabian Style

Andrei Shoppert; Dmitry Valeev; Irina Loginova; Leonid Chaikin. 2020. "Complete Extraction of Amorphous Aluminosilicate from Coal Fly Ash by Alkali Leaching under Atmospheric Pressure." Metals 10, no. 12: 1684.

Journal article
Published: 27 July 2020 in Journal of Cleaner Production
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In the present paper a novel process of the coal ash treatment was developed and analyzed: a high-pressure autoclave HCl leaching of the coal bottom and fly ash from an Omsk coal-fired power plant. This process was applied to extract aluminum from the coal ash into a chloride solution, which can further be used as a coagulant for water treatment. The Al extraction efficiency in this process can reach over 90 % at certain process parameters discussed in the present study. Kinetics of the leaching process were evaluated using different kinetic (e.g. shrinking core) models. A semi-empirical equation was proposed for description of the kinetics of the leaching process as a function of the HCl concentration, solid-to-liquid ratio and temperature. Different mechanisms of the leaching process were also discussed and proposed. Water treatment by the obtained Al-chloride showed good results compared to an industrial coagulant; the treated water parameters were within the limits recommended by the World Health Organization for drinkable water.

ACS Style

Dmitry Valeev; Irina Kunilova; Andrei Shoppert; Cristian Salazar-Concha; Alex Kondratiev. High-pressure HCl leaching of coal ash to extract Al into a chloride solution with further use as a coagulant for water treatment. Journal of Cleaner Production 2020, 276, 123206 .

AMA Style

Dmitry Valeev, Irina Kunilova, Andrei Shoppert, Cristian Salazar-Concha, Alex Kondratiev. High-pressure HCl leaching of coal ash to extract Al into a chloride solution with further use as a coagulant for water treatment. Journal of Cleaner Production. 2020; 276 ():123206.

Chicago/Turabian Style

Dmitry Valeev; Irina Kunilova; Andrei Shoppert; Cristian Salazar-Concha; Alex Kondratiev. 2020. "High-pressure HCl leaching of coal ash to extract Al into a chloride solution with further use as a coagulant for water treatment." Journal of Cleaner Production 276, no. : 123206.

Journal article
Published: 30 May 2020 in Minerals
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One of the potential sources of rare-earth elements (REE) is the industrial waste known as red mud (bauxite residue), in which the majority of REE from the initial bauxite are concentrated via the Bayer process. Therefore, the studies of the subject, both in Russia and outside, focus almost exclusively on red mud processing. This article looks into the possibility of REE concentration into red mud by leaching an intermediate product of the bauxite sintering process at Russian alumina refineries, namely electrostatic precipitator (ESP) dust. The experimental works were performed by X-ray diffraction (XRD)and electron probe microanalysis (EPMA) of the sinter and sinter dust. The determination of major and rare-earth elements in the sinter from the rotary kilns and in the ESP dust before and after leaching was carried out by X-ray fluorescence (XRF) and plasma mass spectrometry (ICP-MS). The study showed that it is possible to obtain red mud that contains three times more REE than traditional waste red mud after two-stage leaching ESP dust in the water at 95 °C followed by leaching in an alkaline-aluminate liquor at 240 °C. The shrinking core model was used to study the kinetics of leaching of the original ESP dust and water-treated dust in alkaline-aluminate liquor. The study showed the change in the limiting stage of the alkaline leaching process after water treatment, with the activation energy growing from 24.98 to 33.19 kJ/mol.

ACS Style

Leonid Chaikin; Andrei Shoppert; Dmitry Valeev; Irina Loginova; Julia Napol’Skikh. Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust. Minerals 2020, 10, 500 .

AMA Style

Leonid Chaikin, Andrei Shoppert, Dmitry Valeev, Irina Loginova, Julia Napol’Skikh. Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust. Minerals. 2020; 10 (6):500.

Chicago/Turabian Style

Leonid Chaikin; Andrei Shoppert; Dmitry Valeev; Irina Loginova; Julia Napol’Skikh. 2020. "Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust." Minerals 10, no. 6: 500.

Journal article
Published: 29 April 2020 in Metals
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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.

ACS Style

Dmitry Valeev; Andrei Shoppert; Alexandra Mikhailova; 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 2020, 10, 585 .

AMA Style

Dmitry Valeev, Andrei Shoppert, Alexandra Mikhailova, 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. 2020; 10 (5):585.

Chicago/Turabian Style

Dmitry Valeev; Andrei Shoppert; Alexandra Mikhailova; Alex Kondratiev. 2020. "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: 585.

Journal article
Published: 23 December 2019 in Metals
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The chemical and mineral composition of the red mud from the Ural Aluminum Plant were studied by XRF, XRD, and Mössbauer spectroscopy. Experiments on reductive smelting of red mud were carried out in a range of temperatures (1650–1750 °C) to recover iron from the aluminum production waste with maximum efficiency. It was found that it is possible to obtain pig iron with a high content of titanium, phosphorus, and vanadium, and low sulfur content. The efficiency of iron recovery at 1750 °C was found to be around 98%. Thermodynamic calculations were carried out to assist in finding the optimal conditions for the process (e.g., carbon content, furnace temperature, slag liquidus temperature). It was also found that the pig iron phase obtained at 1650 to 1700 °C is not separated from the slag phase into ingot compared with the sample obtained at 1750 °C. Pig iron obtained at 1750 °C can be used to produce molds for the steel-casting equipment.

ACS Style

Dmitry Valeev; Dmitry Zinoveev; Alex Kondratiev; Dmitry Lubyanoi; Denis Pankratov. Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings. Metals 2019, 10, 32 .

AMA Style

Dmitry Valeev, Dmitry Zinoveev, Alex Kondratiev, Dmitry Lubyanoi, Denis Pankratov. Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings. Metals. 2019; 10 (1):32.

Chicago/Turabian Style

Dmitry Valeev; Dmitry Zinoveev; Alex Kondratiev; Dmitry Lubyanoi; Denis Pankratov. 2019. "Reductive Smelting of Neutralized Red Mud for Iron Recovery and Produced Pig Iron for Heat-Resistant Castings." Metals 10, no. 1: 32.

Journal article
Published: 06 December 2019 in Metals
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Red mud is a by-product of alumina production from bauxite ore by the Bayer method, which contains considerable amounts of valuable components such as iron, aluminum, titanium, and scandium. In this study, an approach was applied to extract iron, i.e., carbothermic reduction roasting of red mud with sodium and potassium carbonates followed by magnetic separation. The thermodynamic analysis of iron and iron-free components’ behavior during carbothermic reduction was carried out by HSC Chemistry 9.98 (Outotec, Pori, Finland) and FactSage 7.1 (Thermfact, Montreal, Canada; GTT-Technologies, Herzogenrath, Germany) software. The effects of the alkaline carbonates’ addition, as well as duration and temperature of roasting on the iron metallization degree, iron grains’ size, and magnetic separation process were investigated experimentally. The best conditions for the reduction roasting were found to be as follows: 22.01% of K2CO3 addition, 1250 °C, and 180 min of duration. As a generalization of the obtained data, the mechanism of alkaline carbonates’ influence on iron grain growth was proposed.

ACS Style

Dmitry Zinoveev; Pavel Grudinsky; Andrey Zakunov; Artem Semenov; Maria Panova; Dmitry Valeev; Alex Kondratiev; Valery Dyubanov; Alexander Petelin; Dmitry Valeev. Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud. Metals 2019, 9, 1313 .

AMA Style

Dmitry Zinoveev, Pavel Grudinsky, Andrey Zakunov, Artem Semenov, Maria Panova, Dmitry Valeev, Alex Kondratiev, Valery Dyubanov, Alexander Petelin, Dmitry Valeev. Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud. Metals. 2019; 9 (12):1313.

Chicago/Turabian Style

Dmitry Zinoveev; Pavel Grudinsky; Andrey Zakunov; Artem Semenov; Maria Panova; Dmitry Valeev; Alex Kondratiev; Valery Dyubanov; Alexander Petelin; Dmitry Valeev. 2019. "Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud." Metals 9, no. 12: 1313.

Journal article
Published: 25 May 2019 in Minerals
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In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic separation and flotation methods. The wet magnetic separation used in the study increased the magnetite content in the magnetic fraction from 10.48 to 12.72 wt % compared to dry magnetic separation. The XRD analysis showed that the magnetic fraction primarily consists of magnetite, mullite, and quartz. The SEM analysis demonstrated that magnetite is located primarily on the surface of alumosilicate spheres and has three types of shape: dendritic structures, hexagonal bulk agglomerates, and star-like structures. For the flotation tests, a low-price diesel was used as the collector. It was found that, if CFA particles of 40–71 µm are used, ~99% of unburned carbon can be recovered. It was also found by SEM that, if CFA particles of 71–100 µm are used, alumosilicates on a carbon surface prevent complete interaction of diesel with carbon particles and decrease thereby carbon recovery to 83%.

ACS Style

Dmitry Valeev; Irina Kunilova; Alexander Alpatov; Alika Varnavskaya; Dianchun Ju. Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods. Minerals 2019, 9, 320 .

AMA Style

Dmitry Valeev, Irina Kunilova, Alexander Alpatov, Alika Varnavskaya, Dianchun Ju. Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods. Minerals. 2019; 9 (5):320.

Chicago/Turabian Style

Dmitry Valeev; Irina Kunilova; Alexander Alpatov; Alika Varnavskaya; Dianchun Ju. 2019. "Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods." Minerals 9, no. 5: 320.

Journal article
Published: 01 February 2019 in Journal of Cleaner Production
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Fly ash landfills that accumulate a by-product of coal combustion and gasification represent a permanent threat to the surrounding environment due to many factors (air and water pollution, soil contamination, wildlife poisoning, etc). Moreover, disposed coal fly ash may contain significant amounts of valuable elements that are not extracted and potentially wasted. To improve the above situation, a combined ash treatment process was developed for utilisation of the coal fly ash waste from coal-fired power stations. The ash treatment includes three stages: 1) magnetic separation of an iron-containing fraction, 2) carbon separation by floatation, and 3) extraction of aluminum by the autoclave hydrochloric acid leaching. The lab-scale results of the ash treatment applied to the Ekibastuz brown coal fly ash from the Omsk power stations (Russia) were presented and discussed. The XRD analysis showed that the fly ash consists primarily of quartz, mullite and magnetite. It was found that the magnetic fraction separated at the first stage is enriched in magnetite (over 20 wt. %), the carbon content in the concentrate after flotation increases to 27 wt. %, and 90-95 % of aluminum can be extracted during the autoclave acid leaching. The SEM analysis showed that the magnetite phase is grown on the surface of alumosilicate spheres as ~1 μm cubic crystals. The effect of the autoclave temperature and exposure time on the Al extraction efficiency was also investigated and analysed in the present paper. The optimal autoclave temperature and exposure time were found to achieve the maximum Al extraction efficiency. It was also found by the SEM microanalysis that further extraction of aluminum is not economically feasible since the remaining Al is evenly surrounded by SiO2 in the fly ash particles.

ACS Style

D. Valeev; I. Kunilova; A. Alpatov; A. Mikhailova; M. Goldberg; A. Kondratiev. Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction. Journal of Cleaner Production 2019, 218, 192 -201.

AMA Style

D. Valeev, I. Kunilova, A. Alpatov, A. Mikhailova, M. Goldberg, A. Kondratiev. Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction. Journal of Cleaner Production. 2019; 218 ():192-201.

Chicago/Turabian Style

D. Valeev; I. Kunilova; A. Alpatov; A. Mikhailova; M. Goldberg; A. Kondratiev. 2019. "Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction." Journal of Cleaner Production 218, no. : 192-201.

Journal article
Published: 10 July 2018 in Metals
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Iron contained in coal fly ash of the Ekibastuz power station is distributed between magnetite and hematite. XRD data showed that ~80 wt % of iron is contained in magnetite and ~20 wt % in hematite. The leaching of iron from CFA by HCl was studied. It was determined that leaching efficiency increased with the increase in hydrochloric acid concentration and temperature. The maximum iron extraction efficiency was 52%. Aluminum is contained in the mullite and was practically not leached. The maximum aluminum extraction efficiency was 3.7%. The kinetics investigation showed that the process of iron leaching was controlled by chemical reaction and diffusion process steps, with an activation energy of 33.25 kJ·mol−1. The aluminum leaching process is controlled by a diffusion process step with an activation energy of 19.89 kJ·mol−1. The reaction order of hydrochloric acid is determined to be 0.9 and 0.23 for iron and aluminum, respectively.

ACS Style

Dmitry Valeev; Alexandra Mikhailova; Alexandra Atmadzhidi. Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching. Metals 2018, 8, 533 .

AMA Style

Dmitry Valeev, Alexandra Mikhailova, Alexandra Atmadzhidi. Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching. Metals. 2018; 8 (7):533.

Chicago/Turabian Style

Dmitry Valeev; Alexandra Mikhailova; Alexandra Atmadzhidi. 2018. "Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching." Metals 8, no. 7: 533.

Journal article
Published: 01 September 2016 in Inorganic Materials: Applied Research
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ACS Style

D. V. Valeev; Yu. A. Lainer; A. V. Samokhin; M. A. Sinayskiy; A. B. Mikhailova; S. V. Kutsev; M. A. Goldberg. Physicochemical studies on the thermal hydrolysis of aluminum chloride. Inorganic Materials: Applied Research 2016, 7, 779 -785.

AMA Style

D. V. Valeev, Yu. A. Lainer, A. V. Samokhin, M. A. Sinayskiy, A. B. Mikhailova, S. V. Kutsev, M. A. Goldberg. Physicochemical studies on the thermal hydrolysis of aluminum chloride. Inorganic Materials: Applied Research. 2016; 7 (5):779-785.

Chicago/Turabian Style

D. V. Valeev; Yu. A. Lainer; A. V. Samokhin; M. A. Sinayskiy; A. B. Mikhailova; S. V. Kutsev; M. A. Goldberg. 2016. "Physicochemical studies on the thermal hydrolysis of aluminum chloride." Inorganic Materials: Applied Research 7, no. 5: 779-785.

Article
Published: 16 May 2016 in Metallurgist
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Studies are made of the use of hydrochloric acid for the autoclave decomposition of boehmite-kaolinite bauxites from the North Onezhky Deposit. The spatial location and structure of the bauxites are investigated, and the solid residue left after autoclave decomposition is examined by x-ray phase analysis and electron microscopy to study the mechanism of the bauxites’ dissolution. The data that is obtained confirms the presence of hard films of amorphous silica. These films prevent complete dissolution of the aluminum-bearing minerals: boehmite and kaolinite.

ACS Style

D. V. Valeev; Yu. A. Lainer; Alexandra Mikhailova; I. V. Dorofievich; M. V. Zheleznyi; M. A. Gol’Dberg; S. V. Kutsev. Reaction of Bauxite with Hydrochloric Acid Under Autoclave Conditions. Metallurgist 2016, 60, 204 -211.

AMA Style

D. V. Valeev, Yu. A. Lainer, Alexandra Mikhailova, I. V. Dorofievich, M. V. Zheleznyi, M. A. Gol’Dberg, S. V. Kutsev. Reaction of Bauxite with Hydrochloric Acid Under Autoclave Conditions. Metallurgist. 2016; 60 (1-2):204-211.

Chicago/Turabian Style

D. V. Valeev; Yu. A. Lainer; Alexandra Mikhailova; I. V. Dorofievich; M. V. Zheleznyi; M. A. Gol’Dberg; S. V. Kutsev. 2016. "Reaction of Bauxite with Hydrochloric Acid Under Autoclave Conditions." Metallurgist 60, no. 1-2: 204-211.

Journal article
Published: 01 March 2016 in Inorganic Materials: Applied Research
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The process of the autoclave leaching of boehmite-kaolinite bauxite of Severoonezhsk deposits by hydrochloric acid is researched. The effect of temperature, process time, and concentration of hydrochloric acid necessary for the aluminum transition into solution are investigated. The rate constants and apparent activation energy of the process are determined. The mechanism of bauxite dissolution in hydrochloric acid is proposed. It is shown that the kaolinite dissolution is the limiting stage of the process. The results obtained make it possible to synthesize a new generation of mixed coagulants based on aluminum hydroxychloride and iron.

ACS Style

D. V. Valeev; Yu. A. Lainer; V. I. Pak. Autoclave leaching of boehmite-kaolinite bauxites by hydrochloric acid. Inorganic Materials: Applied Research 2016, 7, 272 -277.

AMA Style

D. V. Valeev, Yu. A. Lainer, V. I. Pak. Autoclave leaching of boehmite-kaolinite bauxites by hydrochloric acid. Inorganic Materials: Applied Research. 2016; 7 (2):272-277.

Chicago/Turabian Style

D. V. Valeev; Yu. A. Lainer; V. I. Pak. 2016. "Autoclave leaching of boehmite-kaolinite bauxites by hydrochloric acid." Inorganic Materials: Applied Research 7, no. 2: 272-277.

Conference paper
Published: 23 February 2016 in IOP Conference Series: Materials Science and Engineering
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A process of dissolution Severoonezhsk deposit boehmite-kaolinite bauxite by hydrochloric acid, as well as the processes that occur during open-air calcination, were investigated. A dehydration process has been studied, and the basic phase transformation temperatures were identified. Temperature and time of calcination influence on bauxite dehydration speed were determined. It is shown that the preliminary calcination increases the extraction ratio of alumina into solution up to 89%. Thermodynamic modelling of physical and chemical processes of bauxite decomposition by hydrochloric acid and the basic forms of aluminium speciation in solution were obtained.

ACS Style

D V Valeev; E R Mansurova; V A Bychinskii; K V Chudnenko. Extraction of Alumina from high-silica bauxite by hydrochloric acid leaching using preliminary roasting method. IOP Conference Series: Materials Science and Engineering 2016, 110, 012049 .

AMA Style

D V Valeev, E R Mansurova, V A Bychinskii, K V Chudnenko. Extraction of Alumina from high-silica bauxite by hydrochloric acid leaching using preliminary roasting method. IOP Conference Series: Materials Science and Engineering. 2016; 110 ():012049.

Chicago/Turabian Style

D V Valeev; E R Mansurova; V A Bychinskii; K V Chudnenko. 2016. "Extraction of Alumina from high-silica bauxite by hydrochloric acid leaching using preliminary roasting method." IOP Conference Series: Materials Science and Engineering 110, no. : 012049.

Book chapter
Published: 07 February 2016 in Light Metals 2016
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ACS Style

Dmitry Valeev; Vyacheslav Pak; Alexandra Mikhailova; Margarita Gol'dberg; Mark Zheleznyi; Irina Dorofievich; Yuri Lainer; Valerii Bychinskii; Konstantin Chudnenko. Extraction of Aluminium By Autoclave Hydrochloric Acid Leaching of Boehmite- Kaolinite Bauxite. Light Metals 2016 2016, 23 -28.

AMA Style

Dmitry Valeev, Vyacheslav Pak, Alexandra Mikhailova, Margarita Gol'dberg, Mark Zheleznyi, Irina Dorofievich, Yuri Lainer, Valerii Bychinskii, Konstantin Chudnenko. Extraction of Aluminium By Autoclave Hydrochloric Acid Leaching of Boehmite- Kaolinite Bauxite. Light Metals 2016. 2016; ():23-28.

Chicago/Turabian Style

Dmitry Valeev; Vyacheslav Pak; Alexandra Mikhailova; Margarita Gol'dberg; Mark Zheleznyi; Irina Dorofievich; Yuri Lainer; Valerii Bychinskii; Konstantin Chudnenko. 2016. "Extraction of Aluminium By Autoclave Hydrochloric Acid Leaching of Boehmite- Kaolinite Bauxite." Light Metals 2016 , no. : 23-28.

Journal article
Published: 24 October 2015 in Russian Journal of Inorganic Chemistry
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ACS Style

D. V. Valeev; V. A. Bychinskii; K. V. Chudnenko. A study of acidic aluminum-containing solutions through modeling physicochemical equilibria by the thermodynamic potential minimization method. Russian Journal of Inorganic Chemistry 2015, 60, 1427 -1431.

AMA Style

D. V. Valeev, V. A. Bychinskii, K. V. Chudnenko. A study of acidic aluminum-containing solutions through modeling physicochemical equilibria by the thermodynamic potential minimization method. Russian Journal of Inorganic Chemistry. 2015; 60 (11):1427-1431.

Chicago/Turabian Style

D. V. Valeev; V. A. Bychinskii; K. V. Chudnenko. 2015. "A study of acidic aluminum-containing solutions through modeling physicochemical equilibria by the thermodynamic potential minimization method." Russian Journal of Inorganic Chemistry 60, no. 11: 1427-1431.