A gold smelting company adopts two-stage roasting technique to process the gold concentrates with high arsenic and sulfur content.The grade of arsenic before roasting is about 10 %.The impurities content after roasting is still high,which is troublesome for the operation of cyanidation gold leaching and zinc powder replacement.After many years’ practice,such measures are adopted as equipment update,enhanced acid washing and countercurrent washing,refined control of cyanidation leaching conditions,effectively improving gold cyanidation leaching rate,lowering consumption of materials and achieving good economic profits.