THERMODYNAMIC AND EXPERIMENTAL SIMULATION OF THE SMELTING PROCESS OF MEDIUM CARBON FERROMANGANESE WITH THE USE OF ZHEZDINSKY MANGANESE ORES

Abstract

This article presents the results of a complete thermodynamic modeling and experimental study of the process of smelting medium-carbon ferromanganese using Zhezdinsky manganese ores. Full thermodynamic modeling of the process of smelting medium-carbon ferromanganese was carried out in the HSC Chemistry 6 software package. Thermodynamic modeling of the smelting process was carried out in the temperature range of 898–1989 K. Thermodynamic analysis for modeling the smelting process was carried out for four real charge compositions depending on the basicity of the slag (CaO/SiO2 – 1,4; 1,6; 1,8; 2,0). Based on the obtained thermodynamic data, an experimental study was carried out on the smelting of medium-carbon ferromanganese in a Tamman laboratory high-temperature furnace. В качестве шихтовых материалов были использованы марганцевая руда Manganese ore MnTot. was used as charge material – 48,23 %, SiO2 – 12.48 %, Al2O3 – 2,76 %, Fetot. – 3,45 %, ferrosilicomanganese grade SMn-17, not less than 90 % lime CaO. According to thermodynamic data, the optimal composition of the slag was established, which provides the highest extraction of manganese into the alloy and metal-slag separation. The chemical composition of the metal obtained in the laboratory is as follows, %:Mn – 83–84; Si – 1,5-3; C – 0,95-1,68; P –0,13-1,6; which corresponds to GOST 4755-91. Slag chemical composition, %: MnO – 10,92-17,90; SiO2 19,02-21,45; CaO 36,92-40,43; FeO – 0,33-0,77. Keywords: ferromanganese, ferrosilicomanganese, thermodynamics, manganese ore, laboratory smelting, slag basicity.