National University of Science and Technology “MISiS”, Moscow, Russia:

A. P. Lysenko, Assistant Professor, e-mail: reikis@yandex.ru

R. S. Selnitsyn, Post-Graduate Student, e-mail: roman89@rambler.ru

This article shows the necessity of utilization of salt aluminium-containing metallurgical slags, which environmental impact and harmful impact on soil, underground waters and atmosphere was estimated and defined. There was offered the combined method of processing of salt aluminiumcontaining slags, which joints the elements of mechanical, hydrometallurgical processing and electrolysis in fluoride melts. This method allows to obtain the following marketable products: covering-degassing flux and aluminium alloy-oxidizer, intended for steel deoxidation. There was carried out the analysis of samples of dumps of LLC “Scientific-Industrial Enterprise “Prominvest” (Vladimir, Russia). There was made a definition that slags contain oxides of metals, which are both more positive and more negative, than aluminium. The carried out thermodynamic calculations allowed to estimate the possibility of reaction flow both in electrolyte, and on cathode. There were also calculated the reaction decomposition voltage values, required for explanation of polarization curves. The obtained reaction decomposition voltage values can be used for definition of potentials of reagents with low concentration, and are interesting for Russian and foreign researchers. Removing of polarization curves made possible to define the standard potentials of metals, included in slag composition. There were carried out the calculations of activity, which made possible to define the concentration of silicon in electrolyte and gaseous phase. Experimental and calculation data are of good convergence. During the research of mechanism of formation of aluminium alloys (oxidators), there was defined the stability of release of metals from slag on aluminium. There was defined the mechanism of impurities' cumulation in electrolyte. There was processed the technology of replacement of electrolyte by cumulation of impurities, more negative than aluminium. There was also defined the principal possibility of obtaining of alloys (oxidators) in aluminium electrolysers. There were developed the technological basis of production of alloys-oxidators for steel from oxide part of dump slags in aluminium electrolyzers.

This work was carried out with the financial support of the Ministry of Education and Science of Russian Federation within the fulfillment of obligations on the Agreement about the subsidies of October 23, 2014 (No. 14.578.21.0072).

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2. Lysenko A. P., Selnitsyn R. S. Pererabotka otvalnykh shlakov vtorichnoy alyuminievoy promyshlennosti (Processing of dump slags of secondary aluminium industry). Vestnik Moskovskogo gosudarstvennogo oblastnogo universiteta. Seriya : Tekhnika i tekhnologiya = Bulletin of the Moscow State Regional University. Series: Technics and Technology. 2013. No. 1. pp. 11–19. 

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