Experimental study of ladle furnace desulfurization with CaO-Al_2O_3-SiO_2 based refining slag

The experiment on desulfurization of molten steel using CaO-Al2O3-SiO2 based refining slag is carried in a small furnace in the laboratory.The effects of refining slag basicity,Al2O3,CaF2 on desulfurization of molten steel are studied.The results show that the dusulfurization rate is over 80 % when the refining slag basicity is changed from 2.85 to 3.45.However,when the mass fraction of Al2O3 in refining slag is 24 %,the desulfurization rate is 83.7 %.With the increase of CaF2 in refining slag the desulfurization rate rises initially and then falls down.The optimum composition of the refining slag is w(CaO)/w(SiO2) =3.0,w(CaF2)=7 %、w(MgO)=6 %、w(Al2O3)=24 %.