Research progress of CO2 resource use for molten steel refining

Abstract

The use of CO2 for molten steel refining is an important supplement to the application of CO2 resources in the steelmaking process. Based on the latest research progress of CO2 used in molten steel refining, the metallurgical reaction behavior of CO2 gas in refining molten steel was analyzed, focusing on the use of CO2 as a protective gas, stirring gas or reaction gas in normal pressure and vacuum refining processes, and the application status in the process of refining outside the furnace. Under normal pressure conditions, CO2 can prevent nitrogen growth in molten steel, regulate the oxidation of molten steel, and extend the lifespan of bottom blow components; Under vacuum conditions, CO2 can not only play its role under normal pressure, but also deeply decarburize, degas, and remove molten steel. The effect of inclusions is more pronounced. Finally, the problems currently faced in the use of CO2 resources in the refining process were pointed out, and the future research on CO2 resource use in the refining process was suggested from the following two aspects: 1) Optimizing the CO2 injection process; 2) In-depth study of CO2 participation basic theory of steelmaking reactions.

Keywords

• steelmaking; co2; refining outside the furnace; reaction mechanism; vacuum; resource utilization