RECYCLING OF CHRYSOTILE-ASBESTOS PRODUCTION WASTE WITH EXTRACTING MAGNESIUM AND OBTAINING A FERROALLOY AND CALCIUM SILICATES
Akylbekov Y.Ye. Shevko V.M. Aitkulov D.K. Karataeva G.E.
2022National 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#6Issue 45619 - 33 pp.
The article considers the results of studies on the processing of a chrysotileasbestos production waste by a pyrometallurgical method. The studies included thermodynamic modeling using the HSC-6.0 software package, based on the minimum Gibbs energy principle, together with the second-order rotatable designs (Box-Hunter plans), as well as electric melting of the waste in a single-electrode arc furnace. Based on the results of the research, it was found that, in equilibrium conditions, 92-98% of magnesium is distilled off from the waste in the presence of 31.8-33.9% of calcium carbide at a temperature of 1725-1883 °C and a pressure of 0.1 bar, 80-85% of CaO turn into calcium silicates (mainly into 2CaO·SiO2); only 8.7-12.5% of silicon is extracted in FS25 grade ferrosilicon; a decrease in pressure from 0.1 to 0.01 bar makes it possible to reduce the temperature of complete distillation of magnesium to 1600°C, and the transition of calcium to calcium silicates to 1300°C; at the electric melting of the chrysotile-asbestos waste at the presence of coke and steel shavings, a FS25 grade ferroalloy is formed with the extraction of 74-85% of silicon in the alloy and ˃94% of magnesium in a gas phase.
chrysotile-asbestos , ferroalloy , magnesium , pyrometallurgy , silicates , thermodynamics , waste
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M. Auezov South Kazakhstan National University, Shymkent, Kazakhstan
National Center on complex processing of mineral raw materials of the Republic of Kazakhstan, Almaty, Kazakhstan
M. Auezov South Kazakhstan National University
National Center on complex processing of mineral raw materials of the Republic of Kazakhstan
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