KAOLINITE RAW MATERIALS OF KAZAKHSTAN AND THE METHOD OF THEIR BENEFICIATION

Abdulvaliyev R.A. Kvyatkovskaya M.N. Imangalieva L.M. Manapova A.I.
2022 National Academy of Sciences of the Republic of Kazakhstan

News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022 #3 Issue 453 6 - 16 pp.

The only enterprise in the Republic of Kazakhstan that produces alumina is the Pavlodar aluminum plant, where low-quality bauxites of the Krasnogorsky mine of the Krasnooktyabrsky deposit serve as raw materials. Bauxites have a low flint modulus and high concentrations of iron and carbonates impurities, which complicates the processing technology. Kaolinite clays can serve as an additional source of alumina in Kazakhstan, both as an additive to improve the sintering process of red sludge by reducing the iron content, and for self-processing into alumina. The most promising are kaolinite clays of the Alekseevsky deposit, however, when using standard techniques, satisfactory enrichment results were not achieved. Kaolinite clays are subjected to gravity enrichment before processing into alumina, to increase the efficiency of which preliminary hydrothermal treatment is used. This study presents the results of gravitational beneficiation of kaolinite clays of Alekseevskoe deposit, which includes hydrothermal pre-treatment in a solution of sodium hydrogen carbonate. It is determined that after hydrothermal treatment the yield of kaolinite fraction increases with increasing temperature, duration and concentration of sodium hydrogen carbonate solution and does not depend on L:S ratio. After hydrothermal pre-treatment of clay the yield of kaolinite fraction increased from 41.4 % to 59.3 % and dispersion of material. The maximum yield of kaolinite fraction was obtained at temperature 150 о С, ratio L:S=10.0, duration of 300 minutes and concentration of sodium hydrogen carbonate solution 120 g/dm³.

fraction , hydrothermal treatment , kaolinite , product yield , quartzite , silica module

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Satbayev University, JSC Institute of Metallurgy and Ore Benefication, Almaty, Kazakhstan

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