Theoretical analysis on the slag forming route of converter gasification dephos-phorization slag with remaining slag blowing
As a by-product of steelmaking process,converter slag has great comprehensive utilization potential,but the enrichment of phosphorus restricts its recycling in the furnace.Based on the theory of gasification dephosphorization in the slag splashing stage,the hot-state experiment of gasification dephosphorization of coke reduction converter slag was carried out in the laboratory.The results showed that the phosphorus distribution ratio of gasification dephosphorization slag increased with the increase of slag basicity when the slag basicity was 2.81-3.71.When the FeO mass fraction of the residue was 16％-28％,the phosphorus distribution of the gasification dephosphorization slag increased with the increase of FeO mass fraction.Gasification dephosphorization slag had certain dephosphorization ability,and the theoretical slagging route in dephosphorization stage should follow high FeO content,with basicity from high to low and then slowly increasing.In the slagging process,the theoretical slag system should be controlled at R=1.55-3.17 and w(FeO)=28％-46％.Using this slag forming route for production practice,the mass fraction of phosphorus in the final molten steel decreased by 0.006 percentage points,the consumption of iron and steel materials decreased by 4 kg/t,and the consumption of slag materials decreased by 4.6 kg/t,which not only ensured efficient dephosphorization,but also reduced the smelting cost.
converter slaggasification dephosphorization slagphosphorus distribution ratioslag forming route
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