Harmless treatment of cadmium-contained waste

The invention discloses harmless treatment of cadmium-contained waste, and belongs to the technical field of heavy metal-contained hazardous waste treatment and metal recovery. The treatment comprisesthe following steps that after copper-cadmium slag is slurried, sulfuric acid leaching is conducted, and then copper is separated by electrolysis; ammonia water is added to adjust a pH value to be 4.5-5.0, then microorganisms are added to carry out a biochemical reaction, zinc dust precipitation is conducted, and separating and filtering are conducted to obtain a crude cadmium ingot; and then zinc mass is precipitated and separated. A final liquid is a solution containing traces of copper, zinc and microbial bacteria and can be used as a fertilizer. According to the treatment, through combination of electrolysis, chemistry and the microorganisms, the extraction efficiency is high, the whole process is of harmless treatment, the environment is protected, and the metal recovery effect is improved. 本发明公开了一种含镉废物的无害化处