THE INFLUENCE OF TEMPERATURE AND PRESSURE ON MAGNESIUM EXTRACTION FROM CHRYSOTILE-ASBESTOS WASTE

Abstract

The article presents the results of studies on the recovery of magnesium by carbon-thermal method to obtain magnesium gas from chrysotile-asbestos waste. The method of thermodynamic modeling using the HSC-5.1 software complex based on the Gibbs minimum energy principle was taken as a research method. In the chrysotile-asbestos waste-carbon-iron system, the onset temperature of magnesium gas formation depends on the type of joint formation of iron silicides and is 1639.8°C for the formation of FeSi; when reducing the pressure from 1 to 0.001 bar, the temperature of the onset of magnesium formation can be reduced by 500°C; to obtain magnesium gas, it is necessary to maintain the temperature for MDO-1700°C at mg(Mg(g)) 86 -87% and the LG pressure from -3 to -2.44.