Optimization of Dephosphorization Rate of Converter Final Slag by Gasification Dephosphorization

The coke powder can be used to remove the P element in the final slag in the form of gaseous form,and the slag can be recycled after treatment.In order to further improve the gasification dephosphorization rate,the optimum industrial experiment was carried out.The results showed that the optimum amount of coke powder was 1.1 times of carbon equivalent,and resulting gasification dephosphorization rate was 42.3%.The gasification dephosphorization rate was as high as 37.9% when the bottom blown flow rate of the slag splashing furnace was controlled at 350 m~3/h.The gasification dephosphorization rate was 34% when the coke powder was 6～8 mm.Further refine of coke powder to 4～6 mm had litter effect on gasification dephosphorization rate.Adding 1/2 of coke powder before slag splash and the rest in 10 s after slag splash,the gasification dephosphorization rate can be increased to 37%.