Experimental Research on RH Desulfurization Slag for Non-oriented Electrical Steel Smelting

Experiments on desulfurization of molten steel using CaO-Al₂O₃-SiO₂-MgO based desulfurization slag was carried out in a 15 kg vacuum induction furnace.The effects of desulfurization slag basicity,MI, Al₂O₃ and CaF₂ on desulfurization of molten steel were studied.The results show that with the increase of basicity,MI,Al₂O₃ or CaF₂ in desulfurization slag,the desulfurization rate rises initially and then decreases.In addition,as the initial sulfur content is 0.009 33%~0.010 73%,the apparent desulphurization rate reaches(0.000 96~0.001 49)%/min within 4 min since the beginning of desulphurization,and the highest and average desulphurization efficiencies are 86.8% and 81.2% respectively.Furthermore,as w_(CaO)=58.15%,w_{(SiO2=4.85%,w(Al2O3)=25%,w(MgO)=6%,w(CaF2)=6%,the desulfurization slag shows the best desulfurization effect,and the sulfur content in molten steel is 0.001 33%.}