State and development options for the raw material base of aluminum in non-bauxite regions

Brichkin, V. N.; Kurtenkov, R. V.; ElDeeb, A.B.; Bormotov, I.S.

doi:10.17580/or.2019.04.06

Cited by 12 publications

(14 citation statements)

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“…According to reaction (5), amorphous alumina is dissolved in the liquor to form hydrated sodium aluminate, thereby increasing the supersaturation of the liquor relative to the coarse Al(OH) 3 particles [52]. Next, dissolved alumina in the form of hydrated sodium aluminate precipitates on the surface of Al(OH) 3 via reaction (6).…”

Section: Sga Production From Amorphous Aluminamentioning

confidence: 99%

“…A decrease in the bauxite quality and orientation of the main aluminum producers (Russia and China) with regards to their own resources has led to investigations of alternative raw materials for SGA production [3]. In fact, it can be obtained from both natural (kaolin clay [4,5] or pyrophyllite ore [6]) and technogenic (red mud [7], coal fly ash (CFA) [8], and secondary aluminum dross [9,10]) materials. The CFA waste generated from coal-fired power plants is one of the most promising raw materials for SGA production [11], since it does not require preliminary grinding, as in…”

Section: Introductionmentioning

confidence: 99%

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Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Valeev

Shoppert

Михайлова

2020

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.

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Section: Sga Production From Amorphous Aluminamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Valeev

Shoppert

Михайлова

2020

Metals

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“…Natural gypsum is also used as a sulfate component, i.e., combined (sulfate) activation [ 14 ]. A supersulfated binder (SSB) compared to ordinary Portland cement (OPC) has advantages such as low heat release during hydration, resistance to sulfates contained in the sea or ground water [ 15 , 16 ]. The main research in recent years has been devoted to the development of eco-friendly SSBs based on industrial by-products and wastes: slags, ash, phosphogypsum, cement dust, or lime-containing by-products of the chemical industry [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

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The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

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“…The characteristics of the raw materials are of paramount importance when selecting the optimal technological process for processing kaolinite clays, which determine the theoretical yield of alumina, the consumption of reagents in key technological operations and the amount of sludge to be further processed, which should maximally meet the capabilities and interests of the respective region [5].…”

Section: Introductionmentioning

confidence: 99%

Research and development of a comprehensive technology for processing kaolinite clays in Kazakhstan

Dyussenova¹,

PhD²,

El‐Amir³

et al. 2021

Challenges of Science

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In the Republic of Kazakhstan, the most promising are kaolinite clays of the Alekseevsky deposit. For effective processing of clays, it is necessary to develop special methods of processing, since satisfactory results were not achieved when using standard methods of gravity processing. The article provides the results of studies of the effect of preliminary chemical activation on the yield of the kaolinite fraction during gravitational processing. Previously, the method of preliminary chemical activation of raw materials in a solution of sodium bicarbonate has proven itself well in the processing of various mineral raw materials. It is determined that as a result of preliminary chemical activation, changes in the phase composition occurred. The dependence of the yield of the kaolinite fraction on the temperature of chemical activation, duration, and the ratio of W:T and the concentration of the sodium bicarbonate solution. Based on the results obtained, a technology for the complex processing of kaolinite clays has been developed, which provides for the preliminary chemical activation of the feedstock at the beginning of the process, which will effectively isolate high-quality kaolinite and quartz products, which will significantly reduce the flow of materials entering for sintering. As a result of activation, the phase composition of the kaolinite fraction has changed: the percentage of the kaolinite fraction has decreased; new phases of muscovite and sodium aluminosilicate appeared; the amount of quartz increased.

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State and development options for the raw material base of aluminum in non-bauxite regions

Cited by 12 publications

References 0 publications

Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Acid and Acid-Alkali Treatment Methods of Al-Chloride Solution Obtained by the Leaching of Coal Fly Ash to Produce Sandy Grade Alumina

Supersulfated Cement Applied to Produce Lightweight Concrete

Research and development of a comprehensive technology for processing kaolinite clays in Kazakhstan

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