Method for preparing manganese zinc ferrite precursor by recycling electrolytic manganese sulfide slag

The invention provides a method for preparing a manganese-zinc ferrite precursor by recycling electrolytic manganese sulfide slag, which comprises the following steps: carrying out mechanical ball-milling on the electrolytic manganese sulfide slag and zinc powder to obtain a ball-milled mixture; a sulfuric acid solution is added into the ball-milled mixture for acid leaching, and acid leaching residues and acid leaching liquid are obtained; the pH value of the pickle liquor is adjusted to 4.5-5.0, an extracting agent formed by mixing P507 and sulfonated kerosene is added for a manganese-zinc co-extraction process, and manganese-zinc co-extraction liquor and manganese-zinc raffinate are obtained; sulfuric acid is added into the manganese-zinc co-extraction solution for manganese-zinc reverse extraction, and a manganese-zinc sulfate solution and a P507 organic phase are obtained; ferrous sulfate and ammonium oxalate are added into the manganese zinc sulfate solution for a coprecipitation process, and filtrate a