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ArticleName Investigation of substantial composition of alumina-bearing material of aluminium electrolysers for usage in primary aluminium technology
DOI 10.17580/tsm.2018.03.05
ArticleAuthor Burdonov A. E., Zelinskaya E. V., Gavrilenko L. V., Gavrilenko A. A.

Irkutsk National Research Technical University, Irkutsk, Russia:

A. E. Burdonov, Assistant Professor of a Chair of Mineral Concentration and Environmental Protection named after S. B. Leonov, e-mail:
E. V. Zelinskaya, Professor of a Chair of Mineral Concentration and Environmental Protection named after S. B. Leonov


LLC “RUSAL-Engineering and Technological Center”, Krasnoyarsk, Russia:
L. V. Gavrilenko, Manager of Department of Technologies and Technological Progress in Aluminium Production


JSC “RUSAL-Bratsk Aluminium Smelter”, Bratsk, Russia:
A. A. Gavrilenko, Director of Ecology, Labour Protection and Industrial Safety


The paper presents studies on the research of material composition of aluminacontaining estimates, formed in the process of aluminium production on electrolysers with self-baking anodes during technological operations at PJSC “RUSAL Bratsk”. During the research, the content of valuable components and impurities in a sample of various classes was determined. It was found that aluminium is concentrated in fractions –0.315+0.16 mm (45.7%) and –0.16+0 mm (48.8%), silicon in the fraction –0.63+0.315 mm (1.91%), iron in –1.25+0.63 mm (0.601%) and –0.63+0.315 mm (0.62%). The material consists of cryolite (Na3AlF6), chiolite (Al3F14Na5), quartz, feldspar, carbonaceous matter and technogenic phase of the composition (NaF)·1.5CaF2·AlF3. The products revealed two phases: dark, black-gray and light, grayish-white. It was proved that these phases have significant differences in chemical composition of the feedstock. In the quantitative ratio, in all products, the light gray phase predominates (the fraction ratio in the samples is 90:10–95:5). The analysis of the work is carried out the operating technological scheme of processing the estimate. It is established that it is necessary to improve it with inclusion of possibly magnetic or electric separation operations, as well as dry gravitational or special methods for removing impurities.

keywords Alumina-containing estimates, aluminium, material composition, purification, impurities, technological scheme

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