Abstract:Leaching of copper and arsenic from white dust were carried out by two-stage acid leaching and oxidation acid leaching. The results show that it is difficult to obtain better leaching index by conventional acid leaching, but leaching rate of Cu and As can be improved with assistance of hydrogen peroxide addition. Leaching rate of Cu and As is 95.38% and 89.65% respectively under the conditions including L/S=10, initial sulfuric acid concentration of 60 g/L, dosage of hydrogen peroxide (30% concentration) of 1 mL/g, reaction temperature of 80 ℃, and leaching time of 6h.