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1/2019 (10) UDC 54 ISSN 2307-5252 Russian Academy of Sciences 0+ TRANSACTIONS Kola Science Centre CHEMISTRY AND MATERIALS series 3 Editorial Council: G. G. Matishov, Acad. of RAS, A. I. Nikolaev, Cor. Member of RAS, F. D. Larichkin, Dr. Sc. (Economics), V. A. Putilov, Dr. Sc. (Engineering), E. D. Tereshchenko, Dr. Sc. (Physics and Mathematics), A. S. Karpov PhD (Engineering) - Executive Secretary Scientific and Practical Approaches in Chemistry and Technology Proceedings of the XIII Interregional Scientific and Technical Conference of Young Scientists, Specialists and Students, Editorial Board: S. A. Kuznetsov, Dr. Sci. (Chem.), Executive Editor, P. B. Gromov, PhD (Eng.), Deputy Executive Editor, S. M. Masloboeva, PhD (Eng.), Secretary, T. N. Vasilleva, PhD (Eng.), Secretary Apatity, April 17-19, 2019 DOI: 1 0.25702/KSC.2307-5252.2019.10.2 Editors: A. N. Nikolaev, Corr. Member of RAS, Dr. Sci. (Eng.), D. P. Domonov, PhD (Chem.) Editor-in-Chief: S. V. Krivovichev, Corr. Member of the RAS, Prof. Deputy Editor-in-Chief: V. K. Zhirov, Cor. Member of RAS 14, Fersman str., Apatity, Murmansk region, 184209, Russia Tel. (81555) 7-53-50; 79-5-95, Fax: (81555) 76425 E-mail: ksc@ksc.ru . www.ksc.ru, naukaprint.ru © Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, 2019 © Kola Science Centre of Russian Academy of Sciences, 2019