Sulfur Removal from Spent Ladle Refining Furnace Slag at High Temperature

To develop an effective method for removing sulfur from spent refining slag at high temperature, the slag was treated in argon atmosphere using desulfurization ash as desulfurization reagent. Experimental results revealed that at 1773 K, molar ratio of CaS to CaSO4 + CaSO3 of 3:1, and reaction time of 2 hours, sulfur removal efficiency reached a maximum of 67.9 pct. The optimal ratio indicates the reaction of CaS and CaSO4 + CaSO3 to generate S2 may predominante during processing.