Abstract: Secondary aluminum dross is a main by-product of aluminum industrial production with complex composition and high salt content. The output of secondary aluminum dross in a secondary aluminum plant in Xiangyang is huge， and long-term storage poses a certain threat to the environment. In order to reduce the pollution to the environment and realize the high- value utilization of secondary aluminum dross，polyaluminum chloride was prepared by process of water washing pretreatment， hydrochloric acid leaching and polymerization maturing.The effects of polymerization temperature， polymerization time， polymerization pH value on the alumina contents and basicity of polyaluminum chloride were investigated， and the polyaluminum chloride prepared under optimized conditions was characterized by XRD， scanning electron microscopy and infrared spectrum. The results showed that the production prepared under the optimized conditions of polymerization temperature of 70 ℃， polymerization time of 5 h and polymerization pH of 3.0 displayed alumina contents and basicity of 9.09% and 46.30%， respectively.All indicators of the product were up to the national quality standards. The XRD and scanning electron microscopy analysis showed that the contents of metal impurities in the synthesized polyaluminum chloride was relatively low， and the main substance was sodium chloride. The infrared spectrum indicated that hydroxyl and polymeric aluminum were presented in the polyaluminum chloride molecule.

Key words: secondary aluminum dross, polymerization maturing, polyaluminum chloride, production characteristic