St. Petersburg Mining University (St. Petersburg, Russia):

Kuskov V. B., Associate Professor, Candidate of Engineering Sciences, opikvb@mail.ru
Kuskova Ya. V., Assistant, Candidate of Engineering Sciences, yana.kuskova@gmail.com

The results of the fluorite ores gravity concentration studies are described in the paper. Fluorite concentrates used in chemical and especially optical industries must comply with very stringent requirements, therefore, the costs of these concentrates are also very high. Dressability of two samples was studied: fluorite-quartz-carbonate (sample 1) and fluorite-quartz-carbonate-sulfide (sample 2). The densimetric analysis of these samples, ground to different sizes, was performed. Sample 1 material concentration was studied with respect to different size fractions in heavy-liquid hydrocyclone and in heavy-density medium, and sample 2 material — in heavy-liquid hydrocyclone. Two-stage concentration flow sheet was used for concentration of sample 2 material. Materials of both samples were also concentrated on concentrating table. Heavy-media separation and concentration on concentrating table permitted to obtain highgrade concentrates (at least 98 % CaF₂).
The work was performed with the financial support from the Ministry of Education and Science of the Russian Federation through the Federal Targeted Programme «Research and development in the trends of priority growth areas of the science and technology sector of the Russian Federation for 2014–2020», Project RFMEFI57417X0168.

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