Secondary zinc oxide is one of the main steel rich waste residues in zinc smelting industry. It is named because its main components are secondary zinc oxide (zn2o, zinc bypoxide) and zinc oxide (ZnO, zincoxide). The chemical composition of secondary zinc oxide varies greatly with different ore sources. It generally contains zinc, indium, arsenic, antimony, tin, silver, lead, cadmium, bismuth and other metals, of which lead, arsenic, cadmium and other elements are abundant, which is easy to cause serious pollution to water and soil.