Patent ID: 8440153

Claim:
A method for preparing manganese sulfate and zinc sulfate from waste batteries containing manganese and zinc, the method comprising the steps of: (a) leaching a first waste battery powder with a mixture of a sulfuric acid solution and a reducing agent, wherein the first waste battery powder is in an amount of from 10 to 60 parts by weight, based on 100 parts by weight of the mixture of the sulfuric acid solution and the reducing agent, to form a leached solution; (b) leaching a second waste battery powder with the leached solution obtained from the step (a), wherein the second waste battery powder is in an amount of from 10 to 60 parts by weight, based on 100 parts by weight of the leached solution obtained from the step (a), to form a leached solution; (c) removing heavy metals and organic materials from the leached solution obtained from the step (b), to form a leached solution; and (d) spray-drying the leached solution obtained from the step (c), thus preparing manganese sulfate and zinc sulfate.