THERMODYNAMIC SIMULATION OF SILICOTHERMAL METHOD FOR PRODUCTION OF MEDIUM CARBON MANGANESE IN A CONVERTER

Abstract

The widespread use of manganese in the production of steel somewhat limits its use in the deoxidation of low-carbon steel grades due to the use of manganese, mainly in the form of high-carbon ferromanganese. Thermodynamic modeling of equilibrium in a complex heterogeneous Mn-Si-Fe-P-O-C slag-metal-gas system was carried out for a detailed study of the behavior of metal and slag components for each period separately using the technology of silicothermal reduction of manganese oxides from slag in an envelope with bottom blast. An analysis of the calculated data showed a decrease in the silicon content from 16.05% in the starting material to 0.7 in the final ferromanganese. The carbon content decreases slightly from 1.72 to 1.28%. The manganese content increases from 67.25% in the starting material to 83.8% in the final ferromanganese. For phosphorus, an increase in content is observed in all periods. To achieve acceptable concentrations of phosphorus in the metal, it is necessary to use low-phosphorus initial charge materials. The results of theoretical studies indicate the prospects for further development of the technology for decarburization of high-carbon manganese melts using blowing with gaseous oxygen and treatment with slag melts of a certain composition.