Siberian Federal University (Krasnoyarsk, Russia):

Gilmanshina T. R., Associate Professor, Candidate of Engineering Sciences, gtr1077@mail.ru
Koroleva G. A., Associate Professor, Candidate of Chemical Sciences, gakorol47@mail.ru
Lytkina S. I., Associate Professor, Candidate of Engineering Sciences, svetka-lisa@mail.ru

I. N. Ulianov Chuvash State University (Cheboksary, Russia):

Illarionov I. E., Head of Chair, Doctor of Engineering Sciences, Professor

The article covers grindability test results for graphites by the types of activator mills used. GLS-3 grade graphite of the Kureyskoye deposit with the ash content of 15–20 % was selected for the research. Due to the fact that graphite has lower crushability than most of its associated minerals, coarse fractions of crushed rock are enriched in graphites and fine fractions are rich in waste rock minerals. AGO-2 and Retsch PM 400 MA mills were used for graphite activation. The average particle size was determined using a Fritsch Analysette 22 MicroTec plus particle size analyzer; the ash content was established as per GOST 17818.4-90. The results obtained indicate that, when the minimum particle size is reached, the maximum liberation of graphite aggregates is ensured and, as a consequence, the maximum ash content is achieved. The duration of graphite activation was 20 minutes for the AGO-2 planetary centrifugal mill (with the average particle size decreasing to 2 μm) and 50 minutes for the Retsch PM 400 MA mill (with the average particle size decreasing from 60 to 14 μm). Therefore, it may be concluded that activation in an AGO-2 planetary-centrifugal mill enables achieving lower dispersion rates for cryptocrystalline graphite.

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