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: slimbul@inbox.ru
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.

1. Nikolaev A. Yu., Yasinskiy A. S., Suzdaltsev A. V., Polyakov P. V., Zaykov Yu. P. Aluminum Electrolysis in the KF – AlF₃ – Al₂O₃ Melts and Suspensions. Rasplavy. 2017. No. 3. pp. 205–213.
2. Golovnykh N. V. The simulation of aluminium electrolysis processes production and providing their ecological safety. Ekologiya promyshlennogo proizvodstva. 2009. No. 3. pp. 2–8.
3. Vinogradov A. M., Vasyunina I. P., Mikhalev Yu. G., Polyakov P. V. An investigation of the effect of the electrolyte composition on the consumption of fired anodes during electrolytic aluminium production. Izvestiya vysshikh uchebnykh zavedeniy. Tsvetnaya metallurgiya. 2008. No. 5. pp. 22–28.
4. Sysoev I. A., Ershov V. A., Kondratev V. V. Method of controlling the energy balance of electrolytic cells for aluminium production. Metallurgist. 2015. Vol. 59, No. 5-6. pp. 518–525.

5. Romaseva Yu. A. Characteristics of electrolyser irregularities and methods of their elimination. Innovatsionnaya nauka. 2016. No. 11-2. pp. 65–67.
6. Wang W., Chen W., Gu W. Creep Deformation of Carbon-Based Cathode Materials for Low-Temperature Aluminum Electrolysis. Metallurgist. 2017. Vol. 61 (7–8). pp. 717–725.
7. Sizyakov V. M., Vlasov A. A., Bazhin V. Yu. Strategy tasks of the russian metallurgical complex. Tsvetnye Metally. 2016. No. 1. pp. 32–37.
8. Sizyakov V. M., Vlasov A. A., Bazhin V. Yu., Feshchenko R. Yu. On the Interaction between alumina batch and cryolite-alumina melt. Russian Journal of Non-Ferrous Metals. 2014. Vol. 55, No. 4. pp. 331–335.
9. Bazhin V. Yu., Brichkin V. N., Sizyakov V. M., Cherkasova M. V. Pyrometallurgical treatment of a nepheline charge using additives of natural and technogenic origin. Metallurgist. 2017. Vol. 61, No. 1-2. pp. 147–154.
10. Fruhstorfer J., Aneziris C. G. Influence of particle size distributions on the density and density gradients in uniaxial compacts. Ceramics International. 2017. Vol. 43, No. 16. pp. 13175–13184.
11. Burdonov A. E., Barakhtenko V. V., Zelinskaya E. V., Suturina E. O., Burdonova A. V., Golovnina A. V. Physical and mechanic characteristics of composite materials on the basis of production wastes with various compoundings. Inzhenerno-stroitelnyy zhurnal. 2012. No. 9 (35). pp. 14–22.
12. Khazaei Feizabad M. H., Sharafi S., Khayati G. R., Ranjbar M. Effect of process control agent on the structural and magnetic properties of nano/amorphous Fe_0.7Nb_0.1Zr_0.1Ti_0.1 powders prepared by high energy ball milling. Journal of Magnetism and Magnetic Materials. 2018. Vol. 449. pp. 297–303.
13. Chertov A. N., Gorbunova E. V., Skamnitskaya L. S., Bubnova T. P. Possibilities of quartz-feldspathic mineral material processing by means of photometric sorting by the example of the North Karelian deposits. Obogashchenie Rud. 2015. No. 4 (358). pp. 54–59. DOI: 10.17580/or.2015.04.10
14. Tripathy D. P., Guru Raghavendra Reddy K. Novel methods for separation of gangue from limestone and coal using multispectral and joint color-texture features. Journal of The Institution of Engineers (India): Series D. 2017. Vol. 98 (1). pp. 109–117.
15. Skorokhodov V. F., Khokhulya M. S. Effectiveness increase of iron-ore waste separation. Vestnik MGTU. 2009. Vol. 12, No. 4. pp. 619–623.
16. Zhu J.-H. Role and significance of geochemical exploration in the discovery of the Dayangshugou molybdenum deposit, Liaoning. Geology in China. 2007. Vol. 34 (2). pp. 342–346.