Thermodynamic Simulation of Chemical and Phase Transformations in the System of Oxidized Manganese Ore – Carbon

Thermodynamic simulation of chemical and phase transformations was made for the system of oxidized manganese ore – carbon. Prediction of thermodynamic simulation of chemical and phase transformations in the system was carried out using “Astra 4” multipurpose software system designed for simulation of equilibrium states and processes in high temperature systems with chemical and phase transformations developed in Bauman MSTU. Calculations of phase composition and characteristics of the equilibrium were carried out using the reference database on properties of individual substances. The basis for information in the database of “Astra 4” software complex are thermodynamic, thermo-physical and thermochemical properties of individual substances, which were systematized at the Institute of High Temperatures of USSR Academy of Sciences and National Bureau of Standards of the United States, published in periodicals, monographs, handbooks, and processed and calculated in Bauman MSTU. The study of simulation of chemical and phase transformations in the system were carried out in the temperature range of 1573 – 2573 K with carbon content of 5 – 10 – 15 % in the system and pressure of 0.1 MPa. During the simulation it was found that the maximum transition degree of manganese into kMn5Si3 is up to 95.3 % at T = 1873 K and 30 % content of reductant in the system, with further increase in temperature, the manganese begins to move in to the gas phase. Silicon in comparison with manganese, recovers more difficultly, and with temperature increasing begins to transit into the gas phase, the most optimal temperature interval of silicon recovery is 1773 – 1873 K with the content of reductant in the system from 15 to 30 %. The transition degree of iron (αFe , %) in the system depending on temperature and % content of the reducing agent, allowed to determine the optimal temperature range of 1773 – 1873 K when the content of the reducing agent is 15 %. Thermodynamic modeling of phase transitions of the system manganese ore – reducing agent allowed to perform the opportunity of obtaining ferro-silico-manganese from refractory oxidized manganese ore of “Western Kamys” deposit by electric smelting.