Dmitry Valeev

Dmitry Valeev
Russian Academy of Sciences | RAS · Vernadsky Institute of Geochemistry and Analytical Chemistry

PhD
Guest Editor on Special issue of Materials: "Advances in Mineral Processing, Waste Recycling and Extractive Metallurgy"

About

38
Publications
13,080
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435
Citations
Citations since 2017
24 Research Items
422 Citations
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2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
Development the hydrochloric acid technology for alumina and coagulants production from Al-containing ores and wastes.
Additional affiliations
October 2020 - present
Vernadsky Institute of Geochemistry and Analytical Chemistry
Position
  • Senior Researcher
July 2019 - November 2020
National University of Science and Technology MISIS
Position
  • PostDoc Position
March 2018 - September 2020
Russian Academy of Sciences
Position
  • Senior Researcher
Education
November 2012 - November 2016
A. A. Baikov Institute of Metallurgy and Materials Science (IMET)
Field of study
  • Technology for alumina and mixed coagulants production by high-pressure hydrochloric acid leaching from boehmite-kaolinite bauxite
September 2010 - June 2012
National University of Science and Technology MISIS
Field of study
  • The project of the shop for the production of new jewellery alloys in the LLC «Bronnitsky Jewelry Factory»
September 2006 - June 2010
National University of Science and Technology MISIS
Field of study
  • The treatment of gravity gold concentrates using oxidation roasting

Publications

Publications (38)
Article
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. T...
Article
Full-text available
The chemical and mineral compositions of bauxite recovered from the Severoonezhsk Bauxite Mine (Arkhangelsk region, Russia) were studied by XRD, ICP-OES, TG/DSC, SEM, TEM, and Mössbauer spectroscopy. The iron-containing minerals of the bauxites were found to comprise alumogoethite (α-Fe1–xAlxOOH), alumohematite (α-(Fe1–xAlx)2O3), alumoakaganeite (β...
Article
Coal combustion used by the Combined heat and power plants (CHPs) generates solid wastes - coal fly ash (CFA). Up to 22% of the total electricity supply in Russian is coal-generated, this value is forecasted to not decrease until 2035, which in the next 14 years will translate into the accumulation of more than 260 Mt of CFA on the CHPs landfills....
Article
High-silica bauxite is not used to obtain sandy-grade alumina owing to its low alumina/silica ratio (μSi < 3). Acidic methods, such as the use of HCl and NH4HSO4, show promise for treating this raw material. The leaching of boehmite-kaolinite bauxite from the Severoonezhsk deposit mine (Arkhangelsk region, Russia) using a mixture of NH4HSO4 and H2S...
Article
Coal fly ash (CFA) as a potential resource for rare earth elements and yttrium (REY) has attracted extensive attention over the past few years. This paper focuses on studying microwave systems for the leaching of REY from CFA. Leaching parameters including hydrochloric acid (HCl) concentration, microwave heating time, microwave heating rate, and te...
Experiment Findings
Full-text available
Article
Full-text available
The addition of active seed for increasing the precipitation rate leads to the formation of fine Al(OH)3 particles that complicates separation of solid from the mother liquor. In this study, the enhanced precipitation of coarse Al(OH)3 from sodium aluminate solution using active agglomerated seed was investigated. Aluminum salt (Al2(SO4)3) were use...
Article
Full-text available
This Special Issue of Materials is devoted to various aspects of coal fly ash (CFA) utilization [...]
Article
Full-text available
Coal fly ash (CFA) obtained from pulverized coal furnaces is a highly refractory waste that can be used for alumina and rare-earth elements (REEs) extraction. The REEs in this type of CFA are associated with a mullite and amorphous glassy mass that forms a core-shell structure. In this research, it was shown that complete dissolution of amorphous a...
Article
Full-text available
Coal ash (CA) is not only one of the most solid wastes from combustion, easily resulting in a series of concerns, but it is also an artificial deposit with considerable metals, such as iron and rare earth. The variation in the coal ash characteristics due to the origins, combustion process, and even storage environment has been hindering the metal...
Article
Full-text available
Bauxite residue (BR), also known as red mud, is a byproduct of the alumina production using the Bayer process. This material is not used to make iron or other iron-containing products worldwide, owing to its high content of sodium oxide and other impurities. In this study, we investigated the hydrochemical conversion of goethite (FeOOH) to magnetit...
Article
Full-text available
Bauxite residue, also known as red mud (RM), from alumina production is the most promising technogenic material for the production of scandium (Sc) and other rare earth elements (REEs). Conveniently, RM is processed by using a strong acid (pH < 2.5), which lead to co-dissolution of iron and other undesirable major components. In this work, for the...
Article
Full-text available
Bauxite residue, known as “red mud,” is a potential raw material for extracting rare-earth elements (REEs). The main REEs (Sc, Y, La, Ce, Nd, Nb, and Sm) from the raw bauxite are concentrated in RM after the Bayer leaching process. The earlier worldwide studies were focused on the scandium (Sc) extraction from RM by concentrated acids to enhance th...
Article
Full-text available
The most promising source of alumina in the 21st century is the coal fly ash (CFA) waste of coal-fired thermal plants. The methods of alumina extraction from CFA are often based on the pressure alkaline or acid leaching or preliminary roasting with different additives followed by water leaching. The efficiency of the alumina extraction from CFA und...
Article
Full-text available
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 t...
Article
Full-text available
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-Na 6 [Al 6 Si 6 O 24...
Article
Full-text available
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...
Article
Full-text available
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....
Article
Full-text available
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...
Article
Full-text available
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 magne...
Article
Full-text available
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 12.7...
Article
Full-text available
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 concentra...
Patent
Full-text available
FIELD: chemistry. SUBSTANCE: invention relates to the chemical industry and non-ferrous metallurgy, in particular to the production of a coagulant based on polyaluminum chloride, used in the purification of drinking and wastewater. Polyaluminum chloride is obtained from bauxite in two stages. The first stage is deironization of bauxite by hydrochl...
Article
Full-text available
A thermohydrolysis process is considered for aluminum chloride hexahydrate as one of repartition stages for a hydrochloric acid technology of alumina production from Russian high-silicon raw materials. A physicochemical study is performed for the burning of AlCl3 · 6H2O, and the temperature ranges for the removal of water and chloride ions are dete...
Article
Full-text available
Studies are made of the use of hydrochloric acid for the autoclave decomposition of boehmite-kaolinite bauxites from the North Onega 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...
Article
Full-text available
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 d...
Article
Full-text available
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 dehydrat...
Conference Paper
Full-text available
In this paper we investigate the process of autoclave extraction of boehmite-kaolinite bauxite for Severoonezhsk deposits by hydrochloric acid. The effect of temperature and duration of the process on transition of aluminum into solution has been studied. The apparent activation energy was defined for the process. The influence of hydrochloric acid...
Article
Full-text available
In this paper we investigated the process of autoclave leaching of boehmite-kaolinite bauxite for Severoonezhsk deposits by hydrochloric acid. The spatial location and structure of bauxite has been studied. The mechanism of dissolution of bauxite by X-ray diffraction and electron microscopy the solid residue after autoclave leaching was shown. The...
Article
Full-text available
The article considers one of the processing means of hydrochloric acid technology for production of alumina from domestic highsilica raw materials — thermal hydrolysis of the hexahydrate of aluminum chloride. Conducted physico-chemical study of the roasting process AlCl3·6H2O and the main peaks of the removal of water and Cl-ion. It is shown, that...
Chapter
Full-text available
In this paper we investigate the process of autoclave extraction of boehmite-kaolinite bauxite for Severoonezhsk deposits by hydrochloric acid. The effect of temperature and duration of the process on transition of aluminum into solution has been studied. The apparent activation energy was defined for the process. The influence of hydrochloric acid...
Article
Full-text available
Thermodynamic modeling of physicochemical processes underlying the preparation of aluminum-containing solutions has been performed. It has been demonstrated that the major aluminum species in solution are aluminum chlorides and hydroxychlorides. Temperature-induced changes in the equilibrium composition of a solution has been studied.
Article
Full-text available
The results of experimental studies to substantiate the danger of a new class of aluminum-based coagulants in North Onega bauxite natural, for its influence on the organoleptic, sanitary-chemical properties of the treated water, the toxicity of the water; assessment of the potential danger of chemicals migrating from coagulant in water.
Article
Full-text available
In this paper we investigate the autoclave process extraction of boehmite-kaolinite bauxite for Severoonezhskdeposits by hydrochloric acid. The effect of temperature, duration of the process and hydrochloric acid concentration on transition of aluminum into solution has been studied. The equilibrium constants and the apparent activation energy were...
Article
Full-text available
The process of dissolution the boehmite-kaolinite bauxite of Severoonezhsk bauxite deposit with hydrochloric acid, and the processes taking place at calcinations in the air were investigated in the following paper. Dehydration has been studied and the main temperature phase transformations were identified. Тemperature and time of calcination influe...
Article
Full-text available
Results of research the separation of aluminium and iron chlorides after dissolution the boehmite-kaolinite bauxites in hydrochloric acid are presented. The conditions influencing on the content of main impurity in aluminum chloride hexahydrate are studied. Various approaches on washing the received crystals from uterine solution are investigated....
Patent
Full-text available
FIELD: chemistry. SUBSTANCE: invention relates to the chemical industry. Mixed coagulant from mineral raw material is obtained by dissolution of boehmite-kaolinite bauxite in an autoclave with hydrochloric acid with concentration 220 g/l with S:L ratio = 1:6 for 1-3 hours at T = 150-180°C. EFFECT: invention makes it possible to increase coagulation...

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Projects

Projects (4)
Project
Dear Colleagues, The permanent growth of the world economy and industry stimulates a constantly increasing production of ferrous and non-ferrous metals, while the depletion of natural resources leads to demands for the development of new technologies for the processing of low-grade ores and for deep recycling of metallurgical and other anthropogenic wastes. These new technologies in materials processing and waste recovery will play a major role in creating a sustainable future for humankind. This Special Issue is devoted to the most relevant research in the pyro- and hydrometallurgy methods for extraction and recycling of ferrous and non-ferrous metals, including related studies of the chemical/phase composition and physical properties of the obtained products (concentrates, slags, metals, oxides, solutions, salts, etc.).
Project
Special Issue Information Dear Colleagues, Coal fly ash (CFA) is the main solid waste from coal-fired power plants. The world’s annual growth of this type of waste is about 700–800 million tons. CFA contains oxides of non-ferrous metals (SiO2, Al2O3, Fe2O3, CaO), as well as unburned carbon and rare earth elements. So, CFA can be used as feedstock in metallurgy, chemical and construction industries. The novel science direction is the use of CFA to reduce CO2 emissions by reacting a part of the carbon dioxide with calcium oxide and obtaining construction materials. An important direction is the zeolite production. This type of materials can be used for the purification of wastewater from heavy metals. It is promising to use СFA for the production of ceramics with high physical properties based on silicon carbide (SiC). In addition, new studies of an Al2O3-SiO2-Fe2O3-CaO system are needed to simulate the coal combustion process to obtain CFA with a necessary chemical composition for further recycling. Using new methods of green chemistry (hydrometallurgy and/or pyrometallurgy), on the one hand, it is possible to reduce the negative impact of CFA on the environment and human health and, on the other hand, to obtain new materials with a lower cost. Dr. Alex Kondratiev Dr. Dmitry Valeev Guest Editors
Project
Investigation of the bauxite leaching by hydrochloric acid (preliminary roasting of bauxite or use of high-pressure reactors), purification of Al-Cl liquors from iron(III) by solvent extraction with mixture of aliphatic alcohol and ketone, crystallization of aluminum chloride hexahydrate (ACH), calcination of ACH to obtain sandy grade alumina.