Method for preparing battery grade manganese sulfate by using zinc electrodeposition manganese-containing anode mud

The invention discloses a method for preparing battery grade manganese sulfate by using zinc electrodeposition manganese-containing anode mud. Sequentially carrying out filter pressing, wet type ball milling and ball milling on the zinc electrodeposition anode slime to obtain anode slime ore pulp; putting the obtained anode slime pulp into a reaction tank, and introducing sulfur dioxide gas to carry out reduction leaching reaction; carrying out filter pressing after the reaction, carrying out neutralization iron removal reaction on the obtained filtrate, and extracting strontium from the obtained leaching residue; after the neutralization iron removal reaction, filter pressing is performed, obtained filter pressing liquid enters an extraction system, P204 + C272 two-stage extraction is performed, and liquid obtained after extraction is a pure manganese sulfate solution; demagnetizing the obtained pure manganese sulfate solution; and carrying out evaporative crystallization on the demagnetized manganese sulfat