Abstract:The silver-separation slag from smelting process of copper anode slime in Kardo furnace was leached by mixed solution of sulfuric acid and sodium chloride. The results show that bismuth and antimony enter into leacheate after being leached, and lead remains in residue after being transformed into lead sulfate. The leaching rates of Bi, Sb, Pb, Ag are 99.5%, 91.2%, 0.7%, 0.8% respectively, and gold is hardly leached under the optimum conditions including H2SO4 concentration of 2.5 mol/L, NaCl concentration of 125 g/L, ratio of liquid to solid of 4∶1, temperature of 95 ℃, and leaching duration of 4 h.