The First Results of the Industrial Application of the EcoSoderberg Technology at the Krasnoyarsk Aluminium Smelter

Buzunov, Victor; Mann, Victor; Chichuk, Evgeniy; Frizorger, Vladimir; Pinaev, Andrey; Никитин, Е.С.

doi:10.1002/9781118663189.ch98

Cited by 14 publications

(6 citation statements)

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“…It is mainly produced by electrolysis of molten cryolite with dissolved alumina and corrective additive; the process also involved a carbon anode [1,2]. The whole world is researching and testing process enhancements focused on saving energy [3][4][5][6], expanding the sourcing [7][8][9][10], improving the process parameters [11][12][13], and addressing the environmental concerns [14][15][16][17][18][19][20]. Russia mainly uses self-baking anodes in electrolysis cells; however, prebaked anodes rated at 300 kA or higher, are increasingly popular thanks to their cost-effectiveness and better environmental performance [5,12].…”

Section: Introductionmentioning

confidence: 99%

How the Chemistry of Raw Materials Affects Aluminum Produced in Cells with Prebaked Anodes

Nemchinova

Lazko

2022

MSF

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This paper analyzes how major impurities found in raw materials affect the chemistry of primary aluminum. Alumina and prebaked anodes tend towards lower quality due to the depletion of natural sources of high-quality bauxites and using low-quality carbon to make prebaked anodes (PA). The authors analyzed the chemistry of raw materials supplied for electrolysis. The paper shows the investigated upward trends in the presence of Fe and Si impurities in alumina and prebaked anodes, which jeopardizes the aluminum production process. The increased presence of such materials worsens the chemical composition of the resulting liquid aluminum. If the finished product is to be of high quality, alumina and PA mast contain, respectively (wt.%): 0.010 and 0.024 Fe, 0.013 and 0.022 Si. The proposed idea is to categorize the alumina in storage. Alumina from different manufacturers must then be batched in such a way as to have consistent, ‘averaged’ chemistry before going to electrolysis cells.

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Section: Introductionmentioning

confidence: 99%

How the Chemistry of Raw Materials Affects Aluminum Produced in Cells with Prebaked Anodes

Nemchinova

Lazko

2022

MSF

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“…В настоящее время российские предприятия, производящие первичный алюминий, осуществляют активный переход на технологию ЭкоСодерберг [1]. Ее очевидными преимуществами являются снижение уровня вредных выбросов фторидов, пыли, диоксида серы и смолистых веществ, повышение среднесуточной эффективности укрытия электролизеров [2].…”

Section: Introductionunclassified

Corrosion of cast iron sections of gas-collecting bells of EcoSoderberg electrolyser

Yur’ev

Temlyantsev

Деев

et al. 2021

Izv. vysš. učebn. zaved., Čern. metall.

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The article presents results of the research of high-temperature gas corrosion of sections of EcoSoderberg electrolyzers’ gas-collecting bells (GSB) made of high-strength VCh50 cast iron with spherical graphite. The gravimetric method was used to study the specific mass losses of the sections due to corrosion. The microstructure of cast iron, structure, chemical and phase composition of corrosion products were studied using optical, electron microscopy and electron microprobe analysis. It was established that the specific weight loss of the sections during operation reaches 0.36 – 0.46 g/(cm2·month). Corrosion of cast iron sections of EcoSoderberg electrolyzers’ GSB is characterized by high unevenness by area. There are cases of decommissioning sections due to local through “burnouts” with a weight loss of 19 – 24 kg. With relatively uniform corrosion, the maximum allowable weight loss of the sections is 25 – 30 kg. To make predictive estimates based on experimental data, dependence of the sections’ mass loss on the operating time was obtained. It was found that the corrosion products of the sections consist of iron oxides and alloying elements of cast iron. Most samples are characterized by increased content of C, S, F, K, Al, and Na. Corrosion products have a pronounced layered structure and contain a large number of defects in the form of pores and cracks. The layers differ in chemical, phase composition, and macrostructure. All the studied samples are characterized by cyclic alternation of relatively dense layers of iron oxides Fe2O3 and Fe3O4 and more porous layers between them. The layers are characterized by increased content of C and F. Sulfur is evenly distributed over the thickness of corrosion products. The studied samples of corrosion products have high defectiveness, friability, large number of pores, cracks, discontinuities, and low adhesion to the surface of cast iron. This is due to the presence of phases and compounds with different coefficients of thermal expansion. The mechanism of corrosion products layers formation was established and scientifically proved.

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“…Aluminium industry is one of the largest in Russian non-ferrous metallurgy; "RUSAL" activity is aimed at extraction of bauxite, alumina refining, and primary aluminum production, as well as powders and alloys on its basis. Company emploees together with scientists improve electrolysis technologies of alumina-cryolite melts for achieving high technical and economical indexes [2,3], expansion of the raw material base [4,5] and environmental improvement [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

Somov¹,

Nemchinova²,

Tyutrin³

2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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Chemical composition and main physical-chemical characteristics (apparent density, electrical resistivity, thermal conductivity, compression strength) carbon cathode block samples of spent lining for aluminium electrolysis unit produced by OJSC "RUSAL Krasnoyarsk"; it is shown that to increase the bath service life it is necessary to form a crust to decrease alumina-cryolite melts penetration into electrolysis carbon cathode blocks which will reduce environmental impact.

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The First Results of the Industrial Application of the EcoSoderberg Technology at the Krasnoyarsk Aluminium Smelter

Cited by 14 publications

References 1 publication

How the Chemistry of Raw Materials Affects Aluminum Produced in Cells with Prebaked Anodes

How the Chemistry of Raw Materials Affects Aluminum Produced in Cells with Prebaked Anodes

Corrosion of cast iron sections of gas-collecting bells of EcoSoderberg electrolyser

Ways of Solving the Ecological Problem of Alluminium Smelting Hard Waste Disposa

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