Abstract:Indium bearing dust from lead reverberatory furnace was leached with oxygen pressure acid leaching process. The effects of H2SO4 initial concentration, oxygen partial pressure, leaching temperature, ratio of liquid to solid (L/S), leaching time, and particle size of dust on the leaching were investigated, and the optimum conditions for oxidic-acidic pressure leaching were obtained. The results show that the leaching rate of indium and zinc reaches 96.74% and 99.19% respectively, and the content of indium in slag is reduced to less than 0.02% under the optimum conditions including H2SO4 initial concentration of 180 g/L, oxygen partial pressure of 0.8 MPa, leaching temperature of 150 ℃, L/S of 5∶1, leaching time of 120 min, and particle size of dust of 0.15~0.12 mm.