Abstract:  Based on the analysis of chemical composition and phase composition of raw materials， the feasibility of microwave-assisted leaching of Cu and Zn in copper smelting dust with copper content 12.67% and zinc content 9.85% was studied. The effects of sulfuric acid concentration， liquid-solid ratio， leaching temperature and leaching time on the leaching rates of Cu and Zn were investigated. The results showed that the leaching rates of copper and zinc were 95.11% and 95.92% respectively under the conditions of sulfuric acid concentration of 5 mol/L， liquid-solid ratio of 10 mL/g， leaching temperature of 80 ℃， and leaching time of 2 h.The analysis of leaching slag shows that the leaching slag mainly consists of residual carbon and iron silicate， after leaching by sulfuric acid， copper ferrite and zinc ferrite and magnetite istranslated into magnetite. Some of the large particles in the leaching slag break into smaller particles， and there are cracks and holes on the surface of the particles， and the leaching slag is loose and porous.

Key words: Copper-smelting dust, Reduction roasting, Leaching, Cooper, Zinc