Abstract:Xinjiang Wuxin Copper Industry Co., Ltd. adopts Ausmelt copper smelting technology, and the copper content in slag of the electric furnace is 0.5% ~ 0.7%, which is higher than the grade of some domestic primary copper ore that is being mined and utilized, so it has a great potential for utilization. The plasma technology has been applied to the dilution of copper slag for the first time In this paper. The experimental results show that the instantaneous high temperature of the plasma can break the amorphous vitreous encapsulation in the slag, make the copper particles gather and grow up, and reduce the copper content in the dilution slag. Under the experimental conditions of nitrogen as working gas, gas flow 40L/min, reaction time 20 min and standing for 120 min, the copper content of smelting slag can be reduced to 0.36% by plasma reaction. The addition of coke can improve the reaction efficiency of plasma dilution, and the copper content of slag can be reduced to less than 0.3% after dilution.