Abstract: To address the issues of significant SO3 generation during pyrometallurgical copper smelting,which causes severe equipment corrosion and affects the quality of the final product,a method utilizing sphalerite and galena for SO3 concentration control in pyrometallurgical copper smelting is proposed.Based on a thorough analysis of the tempera-ture and components affecting SO3 formation,this method primarily involves spraying and blowing sphalerite and galena into the boiler flue to reduce oxygen concentration,thereby controlling SO3 levels in the flue gas.Experimental results indicate that,compared to the original SO3 concentration of 0.5 %,the addition of sphalerite and galena reduced the overall SO3 concentration to below 0.01 % in the tests.The copper grade ranged between 99.9 % and 100 %,whereas copper grades obtained without any oxygen-consuming agents ranged from 99.4 % to 99.6 %.Therefore,this  method has significant positive implications for controlling the quality of pyrometallurgical copper smelting products.