DOI: 10.5593/SGEM2014/B13/S4.127


L. S.Skamnitskaya
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 995-1002 pp

Shungite is a mixed type of carbon-cherty rocks because it consists of amorphous carbon which displays a distinctive structure: shungite matter, quartz, mica and metal oxide impurities. There are no analogues to shungite rocks in the world, for shungites are only known from Karelia, Russia. The study of shungite rocks from the Tolvuja structure has shown that sodium-series shungite rocks (Lebeshchina deposit) differ considerably from potassium-series shungite rocks (Zazhogino and Maksovo deposits). Potassium-series shungite rocks are composed dominantly of fine-crystalline aggregate of sericite-biotite-quartz composition with finely dispersed shungite matter. The rocks are massive. Three morphotypes of quartz, measuring over 20 μm, have been identified. Micas are 0.1-0.5 μm and pyrite up to 1μm in size. The ash portion contains 0.04-0.08% Nа2О and 1.31- 2.35% К2О. At the Maksovo deposit, shungite rocks are brecciated and have a shungitecherty matrix. They are similar in chemical composition and structure to Zazhogino shungites. Their ash portion contains 0.1-0.38% Nа2О and 1.28-2.47% К2О. The sodium-series shungite rock body at the Lebeshchina target is heterogeneous in composition. There are transitional varieties between carbon-rich sodium-series rocks and shungite-albite rocks that contain 13-19.5%. Their alkali concentration varies substantially: 3.08-8.33% Nа2О, 0.1-4.07% К2О. Variable rock composition within a variety, confirmed by long-term studies, is an essential index in industrial production. Electrical conductivity is one of the properties responsible for shungite application. Electrical conductivity-based methods are most efficient mechanical methods for enrichment of compositionally variable rocks from the practical point of view. The study of high electrical conductivity shungite production from rocks differing in carbon content and the mineralogical composition of the matrix has shown that their separation into fractions, differing in electrical conductivity (up to 200 Cm/m), by the induction radioresonance method using lumps of shungite is promising. The natural electrical conductivity of Zazhogino shungite rocks is 43 Cm/m and that of Maksovo shungite rocks is 35.6 Cm/m. The separation efficiency of all shungite rocks has been found to depend on Н2О concentration and density.

Keywords: shungite, chemical composition, enrichment, electrical conductivity, application

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