The solid hazardous waste generated in the purification process of the zinc hydrometallurgy system mainly contains valuable metals such as Zn, Cu, Cd, Co, Ni, etc., and has high recycling value.

　　The traditional recovery process has the disadvantages of high energy consumption, high pollution, complex process, low quality, low metal recovery rate, large consumption of auxiliary materials, large investment and so on. In addition, the small and medium-sized pyrometallurgical smelting method has been explicitly prohibited. Since this slag exceeds the standard impurities of copper concentrate by tens to hundreds of times, it is unscientific to directly enter the copper smelting system.