Comparison of twostage dephosphorization during remaining #br# slagdouble slag process in converter
WANG Linzhu1，BAO Yanping2，LI Xiang3
(1. School of Materials and Metallurgy， Guizhou University， Guiyang 550025， Guizhou， China；
2. State Key Laboratory of Advanced Metallurgy， University of Science and Technology Beijing， Beijing 100083， China；
3. School of Materials and Metallurgical Engineering， Guizhou Institute of Technology， Guiyang 550003， Guizhou， China)
Abstract： In order to obtain the key process parameters of twostage dephosphorization，the production data during remaining slagdouble slag process for 100 t converter were collected. The favorable conditions of dephosphorization and decarburization were compared. The results show that there was a significant difference in the change rules of phosphorus removal with the changing conditions between these two stages. The optimal dephosphorization effect can be obtained in dephosphorization stage when the basicity of slag was in the range of 1.8~2.2，the mass percent of Fe2O3 was 23%28% and molten steel temperature changed from 1 350 to 1 400 ℃. Better dephosphorization effect can be obtained by increasing the basicity of slag and Fe2O3 mass percent，or decreasing the temperature of molten steel in decarburization stage when the basicity of slag was in the range of 3.25.2，the mass percent of Fe2O3 was 18%30% and the molten steel temperature changed from 1 600 to 1 700 ℃. Thermodynamic equilibrium state have not been reached during dephosphorization stage and decarbonization stage. It was further to be thermodynamic equilibrium state in dephosphorization stage but closer to that in decarbonization stage.
王林珠，包燕平，李翔. 转炉留渣双渣工艺两阶段脱磷对比[J]. 钢铁, 2019, 54(8): 37-42.
WANG Linzhu，BAO Yanping，LI Xiang. Comparison of twostage dephosphorization during remaining #br# slagdouble slag process in converter. Iron and Steel, 2019, 54(8): 37-42.
