Thermodynamic and experimental simulation of the selting process of high-carbon ferrochrome with the use of high-ash coal «Saryadyr»

Abstract

The paper presents the results of scientific research, which are the basis for the development of technology for producing high-carbon ferrochrome using a qualitatively new reducing agent in the charge - high-ash coal from the Saryadyr deposit. To analyze the carbothermal reduction of chromium, the method of full thermodynamic modeling (TTM) of metallurgical processes was used, implemented in a computer system using the HSC Chemistry 6 software package, in the temperature range of 600-2800 K. The thermodynamic calculation showed that sharp technological deviations in the smelting of carbonaceous ferrochromium is not observed using high-ash coal, the process proceeds evenly, with complete reduction of chromium and iron. According to the content of silicon oxide and aluminum in coal ash, it was found that it can successfully replace quartzite in the charge mixture. On the basis of thermodynamic data, experimental studies of the technological process of smelting carbonaceous ferrochromium using high-ash coal Saryadyr in the Tamman high-temperature laboratory furnace were carried out. The Tammann Resistance Furnace is a research facility designed to simulate metallurgical processes at high temperatures. In laboratory studies, prototypes of carbon ferrochrome were obtained, which meets the requirements of the Fh800 brand.