METHOD FOR RECOVERING METAL AND CHEMICAL VALUES

摘要

A method for recovering metals from industrial waste streams (500) which entails treating the waste streams with an ammonium chloride solution (100), separating the undissolved precipitates comprising iron compounds from the leachant solution, further treating the undissolved precipitants by elevated temperature roasting resulting in an iron-based feedstock (200), displacing metal ions including lead and cadmium from the solution using zinc metal, further treating the solution to remove zinc compounds therefrom, further treating the zinc compounds and the undissolved components with a dissolving solution, and further treating the displaced metal ions to recover lead, cadmium and zinc therein using various methods including electrolysis.