Irkutsk National Research Technical University, Irkutsk, Russia:

E. P. Rzhechitskiy, Senior Researcher of Innovation Technologies Department
V. V. Kondratev, Head of Innovation Technologies Department
A. I. Karlina, Chief Analyst of Scientific Effort Office

Siberian Federal University, Krasnoyarsk, Russia:
S. G. Shakhray, Assistant Professor (Chair of Technosphere Safety of Mining and Metallurgical Production), e-mail: shahrai56@mail.ru

This article identifies the main types of solid fluorine-carbon containing wastes which may be processed with obtaining aluminium fluoride AlF₃. There was calculated the mass of excess electrolyte, forming in the conditions of use of electrolyzers with baked anodes and “dry” gas purification. Experimental data of aluminium fluoride obtaining from wastes are shown. Implementation of this technology may reduce the consumption of fresh AlF₃ by 6–8 kg per a ton of metal, and scarce fluorite concentrate consumption. Ecological situation in aluminium smelter regions may be significantly improved. The main waste types in Soderberg aluminum technology are: gas purification dust and sludges, coal froth flotation tails, electrolyzer overhaul materials, nonprocessed part of coal froth, mechanical wastes (dust, etc.). Aluminum production in electrolyzers with baked anodes and “dry” gas purification form the following wastes: electrolyzer overhaul materials, small amount of coal froth and excess electrolyte (a new type of wastes). Sodium oxide (Na₂O), contained in alumina, causes the formation of excess electrolyte.
Authors used the results of the investigations, carried out within the Federal Target Program “Investigations and developments by the priority ways of development of scientific-technical complex of Russia for the period of 2014-2020”. Unique identifier of applied research and experimental developments is RFMEF I 5 7 7 1 5 X 0 1 9 0.

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