Thermodynamic Justification of Obtaining Ferroalloy from a Mixture of Chrysotile-Asbestos Waste and Carbonaceous Rock

Abstract

The results of research on the thermodynamic prediction of obtaining ferroalloys with the reduction and distillation of magnesium from a mixture of chrysotile-asbestos waste produced by Kostanay Minerals JSC and carbonaceous rock are presented. The research was carried out by thermodynamic modelling methods using the HSC-6.0 Chemistry software package of the Finnish metallurgical company Outokumpu based on the principle of the Gibbs minimum energy and a rotatable second-order plan (the Box-Hunter plan). Based on the conducted studies on the distribution of Si, Al, Mg between the condensed and gas phases, it was found that the formation of ferrosilicoaluminum of the FS45A10 brand with a content of 7.5-10.1% Al and 42.5-44% Si occurs in the presence of 25-25.9% iron at 1959-2000°C; ferrosilicon of the FS45 brand with a content of 41.0-44.4% Si and < 2.5% Al is formed in the temperature range of 1800-1877°C in the presence of 25.4-35% iron. In addition to branded ferrosilicon and ferrosilicoaluminum, it is possible to obtain Fe-Si-Al ligatures containing 2.5-10.1% Al and 41.0-44.7% Si from a mixture of chrysotile-asbestos production wastes and carbonaceous rock. In the presence of 25