Abstract:Rotary kiln volatilization is a mature process to treat zinc leaching residue. An experimental study on reduction and volatilization of zinc, lead and indium was carried out for certain hydrometallurgical zinc leaching residue. The results show that phase in zinc leaching slag is mainly zinc ferrite. Volatilization rate of zinc, lead and indium is 99.92%, 99.59 and 83.46%, respectively, and content of zinc, lead and indium in slag is 0.025%, 0.027% and 0.013%, respectively, under the conditions including coal ratio of 30%, volatilization temperature of 1 150 ℃, and volatilization time of 1 h. Kiln slag can be magnetically separated to recover iron, and then recover carbon, copper and silver by flotation. Tailings can be used as raw materials for building materials such as cement and bricks.