Sulfur could be removed effectively in the process of copper slags smelting chlorination,which is beneficial to the recovery of iron from copper slags. With the help of the thermodynamic calculation,X-ray diffraction analysis and inductively coupled plasma analysis, the sulfur behavior characteristic in the process of copper slags smelting chlorination was studied.In a certain range, the sulfur removal rate from copper slags was improved with the increase of the holding temperature,residence time and O2velocity. However,SO2was oxidized by the pumped O2and then reacted with CaO forming CaSO4when the holding temperature was 1 723 K,which caused the sulfur content increase. When O2velocity was increased to 0.5 L/min,the reaction interface of SO2and O2nearly coincided with the molten slag surface,and then the CaSO4mode was formed through the reaction of SO2,O2and CaO.It caused the sulfur removal rate being decreased.The sulfur content of the copper slag was decreased from 0.52% to 0.005 11% treated in the condition of holding temperature of 1 573 K,residence time of 25 minutes,O2velocity of 0.4 L/min,and CaCl2addition amounts of 0.1(the mass ratio of CaCl2and copper slags). Sulfur can be removed in the chlorination of copper slags.
