Study on Desulfurization of Steel Q345 during LF Refining at High Basicity Slag System

The effects of LF refining slag ingredient and slag particle size on Q345 steel desulfurization had been determined by a MoSi₂ shaft type electric resistance furnace in laboratory.Test results showed that under refining condition of higher basicity (R=3~53~4.5),the desulfurization rate gradually increased with increasing basicity.When content of Al₂O₃ was in range of 18%~28%,BaO in range of 6%~14% and CaF₂ at 0~10%,there is a optimal desulfurization rate for experimental slag.When refining slag composition,remains constant,particle size decreasing led to increase in desulfurization rate.The optimal slag ingredient at high basicity was obtained by using orthogonal method with related paramenters as follows:R=3~55,w_{Al2O3=23%,wBaO=10%,wCaF2=5%.The higher desulfurization rate can be achieved by reducting particle size of the refining slag.}