Journals →  Tsvetnye Metally →  2018 →  #7 →  Back

ArticleName The efficiency of alkaline-acid method of complex leaching of eudialyte concentrate. Part 1
DOI 10.17580/tsm.2018.07.09
ArticleAuthor Bogatyreva E. V., Chub A. V., Ermilov A. G., Khokhlova O. V.

National University of Science and Technology “MISiS”, Moscow, Russia:
E. V. Bogatyreva, Professor of the Chair of Non-Ferrous Metals and Gold, e-mail:
O. V. Khokhlova, Assistant of the Chair of Non-Ferrous Metals and Gold


JSC “Solikamsk Magnesium Plant”, Solikamsk, Russia:

A. V. Chub, Deputy Head of the Experimental Workshop


A. G. Ermilov, Independent Expert


Eudialyte is one of the most promising sources of rare-earth elements and zirconium in Russia. The main purpose of this research is to study the reactivity of the components of the eudialyte concentrate during the alkaline dissection to determine the conditions that ensure full and selective extraction of silicon into the solution. The features of changing behaviour of size distribution and the specific surface of eudialyte concentrate in the process of short-term preliminary mechanoactivation (MA) in “soft” and “hard” regimes were revealed. The changing behaviour in the specific surface area of the eudialyte concentrate in respect with the duration of short-term preliminary MA is similar to the results of studies conducted with other concentrates of rare metals. Differences in the morphology of the components of the eudialyte concentrate after MA, e. g. eudialyte and aegirine, which resulted from a difference in their physicomechanical and energy properties, were established. The effect of short-term preliminary MA (not more than 2.5 minutes) provided during alkaline leaching (solid : liquid ratio S:L = 1:10; CNaOH = 40%; T = 100 oC; в = 6 h) is shown to increase the extraction of silicon into the solution from 1 to 55 %. The obtained results are confirmed by the data of thermodynamic calculations and indicate the formation of zirconosilicates. There is a low rate of filtration of the pulp (~0.07 l/(m2·min)).

keywords Rare metals, rare earth metals, silicon, zirconium, eudialyte concentrate, alkaline leaching, mechanical activation

1. Bogatyreva E. V., Khokhlova O. V., Muraveva E. A., Dolgov A. V. Thermodynamic estimation of the probability of chemical reactions during alkaline decomposition of eudialyte concentrate. Tsvetnye Metally. 2018. No. 3. pp. 46–56.
2. The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. Available at: (Accessed date: 08.02.2018)
3. Vaccarezza V., Anderson C. Benefication and Leaching Study of Norra Karr Eudialite Mineral. Rare Metal Technology. 2018. Ed.: H. Kim, B. Wesstrom, S. Alam, T. Ouchi, G. Azimi, N. Neelameggham, S. Wang, X. Guan. Berlin : Springer, 2018. pp. 39–52.
4. Woldman G. M., Zelikman A. N. The theory of hydrometallurgical processes. Moscow : Intermet Inzhiniring, 2003. 464 p.
5. Kaminskiy Yu. D. Mechanochemical reactors of planetary type: theory and practice. Novosibirsk : Nauka, 2015. 200 p.
6. Kulikov B. F., Zuev V. V., Waynshenker I. A., Mitenkov G. A. Mineralogical reference book of the technologist-enricher. Leningrad : Nedra, 1985. 264 p.
7. Bogatyreva E. V. The effectiveness of the use of mechanoactivation. Moscow : Izdatelskiy dom “MISiS”, 2017. 334 p.
8. Molchanov V. I., Yusupov T. S. Physical and chemical properties of finely dispersed minerals. Moscow : Nedra, 1981. 160 p.
9. Zuev V. V., Potselueva L. N., Goncharov Yu. D. Crystalloenergetics as a basis for evaluating the properties of solid materials (including magnesian cements). Available at:
10. Lidin R. A., Andreeva L. L., Molochko V. A. Constants of inorganic substances : a reference book. Moscow : Drofa, 2008. 551 p.
11. Khokhlova O. V., Bogatyreva E. V., Aksenov S. M. Improvement of the alkaline method of dissecting complex concentrates of rare-earth metals. Aktualnye problemy gumanitarnykh i estestvennykh nauk. 2015. No. 11-2. pp. 53–56.
12. Chizhevskaya S. V., Povetkina M. V., Chekmarev A. M., Avvakumov E. G. The influence of mechanical activation on the process of decomposition of zirconosilicates with mineral acids. Khimiya v interesakh ustoychivogo razvitiya. 1998. Vol. 6. pp. 199–205.

Language of full-text russian
Full content Buy