Abstract
The paper presents the results of thermodynamic modeling of the process of smelting a complex alloy from highly active elements Al-Mn-Ca-Si. Thermodynamic modeling was carried out using the universal program for calculating multicomponent heterogeneous systems Terra, which has its own base of thermodynamic properties of individual substances. Since the preliminary calculation based on the standard database showed that the composition of the products differed from the expected one, we took the missing thermodynamic functions of substances from the HSC Chemistry 5.1 database. Initial conditions for modeling alloy melting: temperature range 700 - 2800°C, pressure 0.1 MPa. The initial charge mixture consisted of coal from the Saryadyr deposit, manganese ore from the Yesymzhal deposit, and lime. According to the results of thermodynamic modeling, it was found that the optimal metal yield is achieved in the temperature range of 1400-2000 ° C, and for the efficiency of refining steel from non-metallic inclusions, the most acceptable composition of a complex alloy containing 20-50% silicon, 9.27% aluminum, 12-45 % manganese, 3-20% calcium, 0.01-0.5% phosphorus, 0.05-1.5% carbon and 5-20% iron.