Method for recovering valuable metals from battery grade cobaltous sulfate production waste slag

The invention belongs to the technical field of battery grade cobaltous sulfate production, and discloses a method for recovering valuable metals from battery grade cobaltous sulfate production waste slag, which comprises the following steps: crushing the waste slag generated in the battery grade cobaltous sulfate production process by using a crusher; adding a cadmium-containing zinc sulfate solution into the crushed waste slag, and reacting to obtain a low-cadmium zinc sulfate solution and high-cadmium slag; the method comprises the following steps: mixing high-cadmium slag with copper-cadmium slag purified by a zinc hydrometallurgy system, feeding the mixture to a zinc hydrometallurgy cadmium recovery process, and adding zinc powder for reaction to recover cadmium; a cobalt removal agent and an activating agent are added into the low-cadmium zinc sulfate solution for reaction to recover cobalt, a pure zinc sulfate solution and cobalt residues are obtained, the zinc sulfate solution is sent to a zinc electr