Development of a method for producing hot reducing gas and blast furnace smelting technology therewith

The article is devoted to the topical topic of ferrous metals production, which is a continuation of many scientific works of the Department of Metallurgy, considering the possibility of developing energy-efficient and resource-saving technologies in the field of metallurgy of ferrous and non-ferrous metals, as well as issues of reducing the environmental burden on the environment. Based on the research performed, a method for carrying out blast furnace smelting with the injection of synthetic hot reducing gas (SHRG) obtained from blast furnace gas and non-scarce and relatively inexpensive coals was proposed. Joint injection of pulverized coal fuel (PCF) into the hearth in an amount of 120-138 kg/t of cast iron and hot gas with a flow rate of 300-550 m3/t of cast iron will reduce the consumption of skip coke to 288-322 kg/t of cast iron (by 17-36 %), consumption of equivalent fuel (ce) from scarce energy resources (coke + pulverized coal) will be 458-482 kg/t of cast iron. Increasing the consumption of injected hot water gas to 600-900 m3/t of cast iron reduces the consumption of skip coke to 350-388 kg/t of cast iron (68-105 kg/t of cast iron; 15-21 %) and the consumption of standard fuel from scarce energy carriers (coke) to 388 -426 kg/t of cast iron (154-191 kg/t of cast iron; 26-33 %), which corresponds to the best world analogues in the ironmaking. The use of SHG obtained from blast furnace gas as a reducing gas for the production of pig iron will significantly increase the performance of blast furnace smelting, reduce CO2 emissions into the atmosphere and improve the environmental situation in the metallurgical regions of the country.