Abstract:According to characteristics of replacement slag from zinc hydrometallurgy and properties of different metals, cadmium was selectively separated from copper, gallium and germanium by acid washing to achieve high-efficiency enrichment of copper, gallium, and germanium in solid phase. High-cadmium slag with cadmium grade of >20% was obtained from cadmium-rich acid washing solution by zinc powder replacement. Efficient recovery of cadmium in acid washing process of replacement slag helps to reduce risk of environmental pollution, while enrichment of copper, gallium, and germanium in acid washing slag provides convenience for subsequent comprehensive recovery of resources.