Irkutsk National Research Technical University (Irkutsk, Russia):
Burdonov A. E., Associate Professor, Candidate of Engineering Sciences, slimbul@inbox.ru
Barakhtenko V. V., Associate Professor, Candidate of Engineering Sciences, slimbul@inbox.ru

Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences (Khabarovsk, Russia):
Prokhorov K. V., Head of Common Use Center «Center for Research of Mineral Raw Materials», Candidate of Engineering Sciences, sciencecat86@gmail.com

RUSAL Bratsky Aluminum Plant (Bratsk, Russia):
Gavrilenko A. A., Director for Ecology, Labour Protection & Industrial Safety, Aleksandr.Gavrilenko@rusal.com

Research was carried out in order to study the material composition and fracture work indexes for alumina-containing sweepings generated in aluminum smelting at PJSC RUSAL Bratsk with the use of electrolyzers with self-baking anodes. It was found that aluminum is concentrated with the fractions of –0.315+0.16 mm (45.7 %) and 0.16+0 mm (48.8 %), silicon is concentrated with the fractions of –0.63+0.315 mm (1.91 %), and iron is concentrated as –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 the process-related phase of (NaF)1.5CaF₂AlF₃. The research demonstrated that the alumina-containing material might be characterized as non-abrasive (with the work index of Ai = 0.0184) and very soft under impact crushing (with the work index of CWi = 3.64). The Bond ball mill work index (BWi = 6.47) indicates very low material resistance to ball milling. The introduction of a crushing stage for alumina-containing sweepings will enable the application of dry cascade-gravity and centrifugal sizing for the separation of impurities in the form of SiO₂ and Fe₂O₃ in order to use the aluminacontaining material in primary aluminum smelting.
The work was carried out with the financial support of the project GZ No. 11.8090.2017 / BCh.

1. Satish Reddy M., Neeraja D. Aluminum residue waste for possible utilisation as a material: a review. Sadhana – Academy Proceedings in Engineering Sciences. 2018. Vol. 43, Iss. 8. p. 124.
2. Baranov A. N., Gavrilenko A. A., Volyanskii V. V., Nozhko S. I., Timkina E. V. Technology for preparing calcium fluoride from aluminum production waste. Metallurgist. 2017. Vol. 61, Iss. 5–6. pp. 485–490.
3. Kondratiev V. V., Petrovskiy A. A., Ershov V. A., Sysoeva T. I., Karlina A. I. Results of researches with revealing of technological parameters of processes of recycling and neutralization of the first and second cut of the spent lining of electrolyzers for reception of aluminum fluoride by pyrolytic and hydro chemical method. International Journal of Applied Engineering Research. 2017. Vol. 12, No. 23. pp. 13898–13904.
4. Mahinroosta M., Allahverdi A. Enhanced alumina recovery from secondary aluminum dross for high purity nano-structured γ-alumina powder production: Kinetic study. Journal of Environmental Management. 2018. Vol. 212. pp. 278–291.
5. Skarin O. I., Tikhonov N. O. Calculation of the required semiautogenous mill power based on the bond work indexes. Eurasian Mining. 2015. No. 1. pp. 5–8.
6. Vaisberg L. A., Zarogatskiy L. P. New generation of jaw and cone crushers. Stroitelnye i Dorozhnye Mashiny. 2000. No. 7. pp. 16–21
7. Burdonov A. E., Zelinskaya E. V., Gavrilenko L. V., Gavrilenko A. A. Investigation of substantial composition of alumina-bearing material of aluminium electrolysers for usage in primary aluminium technology. Tsvetnye Metally. 2018. No. 3. pp. 32–38.
8. Naixiang F., Jianping P., Yaowu W., Yuezhong D., Xian'An L. Energy reduction technology for aluminum electrolysis: Choice of the cell voltage. Light metals – Warrendale – Proceedings (Symposia, Light metals; 2013; San Antonio, TX). Hoboken, New Jersey: John Wiley & Sons, 2013. pp. 549–552.
9. Gil'debrandt E. M., Vershinina E. P., Frizorger V. K. Quality of anode mass in aluminum electrolysis technology with the Soderberg anode. Russian Journal of Non-Ferrous Metals. 2014. Vol. 55, No. 2. pp. 120–124.
10. Vaisberg L. А., Demidov I. V., Ivanov K. S. Mechanics of granular media under vibration action: the methods of description and mathematical modeling. Obogashchenie Rud. 2015. No. 4. pp. 21–31. DOI: 10.17580/or.2015.04.05.
11. Blekhman I. I., Vaisberg L. A., Lavrov B. P., Vasilkov V. B., Yakimova K. S. Universal vibrating stand: experience in research, some results. Nauchno-tekhnicheskie Vedomosti SPbGTU. 2003. No. 3. pp. 224–227.
12. Bond F. C. The third theory of comminution. Transactions on AIME Mining Engineering. 1952. Vol. 193. pp. 484–494.
13. Senchenko A., Kulikov Y., Starkey J. Successful implementation of SAG design test in designing and optimization of ore preparation circuits in the territory of Russia and Kazakhstan. Proceedings of 26^th International Mineral Processing Congress. New Delhi, India, 2012. pp. 4857–4864.
14. Fedotov K. V., Senchenko A. E., Kulikov Yu. V. Method of calculating autogenous semiautogenous grinding energy based on combination of the Bond work indice. Gorny Informatsionno-Analiticheskiy Byulleten (nauchno-teknicheskii zhurnal). 2014. No. 11. pp. 127–140.
15. Fedotov P. K. Modeling of ore fracture process in a layer of particles under pressur. Fiziko-tekhnicheskiye Problemy Razrabotki Poleznykh Iskopayemykh. 2014. No. 4. pp. 71–77.
16. Vaisberg L. A., Shuloyakov A. D. Technological possibilities of cone inertial crushers in the production of cubical crushed stone. Stroitelnye Materialy. 2000. No. 1. pp. 8–9.