Abstract:In this paper, the chemical composition characteristics of typical secondary arsenic-bearing materials are analyzed. The alkaline dearsenization process of secondary arsenic-bearing materials produced in nonferrous smelting industry and its principle are summarized, including hydro-dearsenization process or combined pyro-hydro dearsenization process. Three alkaline hydro-dearsenization leaching systems are commonly used: NaOH single- alkali leaching, NaOH-Na2S mixed-alkali leaching and NaOH+Na2S mixed-alkali two-stage leaching. Hydrogen peroxide, pressure, aeration, microwave, ball milling and other oxidation methods are used to enhance arsenic leaching from secondary arsenic-bearing materials. The combined pyro-hydro dearsenization process mainly includes low-temperature alkaline smelting-water leaching, pre-oxidation roasting -alkaline leaching and low-temperature alkaline roasting-hot water leaching. Low-temperature alkaline roasting-hot water leaching process has good selectivity in arsenic removal and wide applicability of secondary arsenic-bearing materials. Based on all the existing research, the existing problems of alkaline dearsenization technology and the research direction of harmless treatment and resource utilization of secondary arsenic-bearing materials are pointed out.