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ArticleName Processing of garnet placer deposits of the White Sea
DOI 10.17580/or.2018.03.04
ArticleAuthor Dumov A. M.

National University of Science and Technology MISIS (Moscow, Russia):

Dumov A. M., Associate Professor, Candidate of Engineering Sciences,


This paper covers the results of laboratory experiments for combined generation of garnet-almandine concentrates through gravitational, magnetic, corona-electrostatic and triboelectrostatic processing. The raw material was represented by natural concentrated material from one of the garnet placer deposits of the White Sea coast. The garnet-almandine mass fraction was approximately 65 % against the usual value of 12–24 %. The main impurities were represented by quartz, amphiboles, magnetite and ilmenite. Amphiboles were represented by hornblende, characterized by widely varying magnetic response values depending on the iron content. The grain size of the material was 0.1 to 0.5 mm, including over 92 % in the range 0.2 to 0.4 mm. The traditional processing method was used for the raw materials. Preliminary gravity concentration was carried out on an SKL-2 concentration table with the yield of coarse concentrate. Magnetite and scrap were isolated from the gravity concentrate by first-stage magnetic separation in a weak field and disposed of as tailings. Separation in a strong magnetic field with a 138 SE separator was used to isolate ilmenite, garnet and part of ferruginous hornblende from the non-magnetic fraction of the first stage. The best possible magnetic field strength was determined. Ilmenite was effectively separated from the garnet in a ES-3 corona-electrostatic separator. The optimum parameters for the operation of the corona-electrostatic separator were established. The recovery of garnet into the concentrate was approximately 88 % with the mass fraction of 90.5 %. The main impurity was represented by ferruginous hornblende. No commercial grade garnet concentrate was obtained. Experiments were carried out with the aim to treat the resulting product to the commercial grade using triboelectrostatic separation in an ERTS separator. The optimum operating mode was selected for the separator. The best result consisted in the recovery of commercial grade garnet concentrate with the mass fraction of garnet of 97 %, with the yield value of 83 % of the gravity concentrate.

keywords Garnet placer deposits, abrasive materials, almandine, gravity concentration, hornblende, magnetic separation, coronaelectrostatic separation, triboelectric separation

1. The results of analysis of garnet sand global market. URL: (accessed: 09.06.18).
2. Indian minerals. Yearbook 2013 (Part-III: Mineral reviews). 52nd edition. Garnet (Final release). Government of India. Ministry of Mines. Indian Bureau of Mine. 2015. July. URL: (accessed: 09.06.18).
3. Ralph C. All about garnet. ICMJ's Prospecting and Mining Journal. 2013. February (Vol. 82, No. 6). URL:
4. Shchiptsov V. V., Skamnitskaya L. S., Kameneva E. E., Savitskiy A. I. Garnet ores of North Karelia, technological approaches to their development and possible uses. Geologiya i Poleznye Iskopayemye Karelii. 2002. No. 5. pp. 82–91.
5. Mineral and raw materials base of the Republic of Karelia. Bk. 2. Petrozavodsk: Karelia, 2006. 356 p.
6. Bubnova T. P., Voytehovski Yu. L., Garanzha A. V. Comparative analysis of properties of abrasive garnets from Makzapakhk deposit (Kola Peninsula) and occurrence Vysota (Northern Karelia). Problems in the rational use of natural and technogenic raw materials from the Barents region in construction and technical material technology. Proceedings of the 2nd International scientific conference. Petrozavodsk: Karelian Research Centre of RAS, 2005. pp. 26–27.
7. Romanovich I. F. Mineral raw materials. Abrasives: reference book. Moscow: Geoinformmark, 1999. 23 p.
8. Andreeva N. N., Shevchenko V. P., Filippov A. S. New data on composition of bottom sediments of Onega Bay, White Sea. Geology of seas and oceans. Proc. of XVIII International conference on marine geology (Moscow, November 16–20, 2009). Moscow: GEOS, 2009. Vol. III. pp. 143–147.
9. Shchiptsov V. V., Bubnova T. P., Skamnitskaya L. S., Garanzha A. V., Rych’yev A. M. Garnet ores of Karelia. Petrozavodsk: Karelian Research Centre of RAS, 2009. 208 p.
10. Evtekhov V. D., Lamrani O., Gurin V. A. Mineralogy and concentratability of Kryvbas Annovsk deposit garnetbearing shales. Gornyi Zhurnal. 1994. No. 5. pp. 11–14.
11. Bubnova T. P., Garanja A. V., Skamnitskaya L. S., Shchiptsov V. V. Karelia garnet ores mineralogical features and enrichment problems. Proceedings of All-Russian scientific conference «Typomorphic minerals and mineral associations as indicators of natural and technogenic deposits scale and ores quality». Ekaterinburg: IGG of UB of RAS, 2008. pp. 98–100.
12. Pat. 2071834 Russian Federation.
13. Bragina V. I., Konnova N. I. Valuable minerals extraction from concentration tailings. Gorny Informatsionno-Analiticheskiy Byulleten. 2011. No. 12. pp. 165–168.
14. Mostyka Yu. S., Mostyka E. N. Magnetic separation kinetics and technology for garnet concentrates conditioning. Gorny Informatsionno-Analiticheskiy Byulleten. 2005. No. 12. pp. 274–280.
15. Belyshev A. K., Myasnikova N. F., Koverdyaev O. N., Tarasov A. N. Development of technology for garnetcontaining raw materials enrichment. Gorny Informatsionno-Analiticheskiy Byulleten. 2000. Vol. 2. pp. 52–54.
16. Falconer A. Gravity separation: Old technique / new methods. Physical Separation in Science and Engineering. 2003. Vol. 12, Iss. 1. pp. 31–48.
17. Cardarelli F. Materials handbook. London: Springer-Verlag, 2000. p. 236.
18. Iranmanesh M., Hulliger J. Magnetic separation: its application in mining, waste purification, medicine, biochemistry and chemistry. Chemical Society Reviews. 2017. Vol. 46, Iss. 19. pp. 5925–5934.
19. Azbel Yu. I., Dmitriyev S. V., Lvov V. V., Mezenin A. O. High-gradient magnetic separation of ilmenite rougher concentrates. Obogashchenie Rud. 2014. No. 5. pp. 18–21.
20. Azbel Yu. I., Dmitriyev S. V., Mezenin A. O., Bukharov M. I. The Butkinsky Mining and Processing Complex rougher concentrate flow sheet development with a view to produce marketable ilmenite product. Obogashchenie Rud. 2015. No. 1. pp. 14–17.

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