Method for preparing high-purity manganese sulfate from electrolytic manganese sulfide slag

The invention provides a method for preparing high-purity manganese sulfate by using electrolytic manganese sulfide slag, which comprises the following steps: adding the electrolytic manganese sulfide slag and an acidic aqueous solution into a ball-milling tank, and carrying out wet ball-milling to obtain acid-controlled ball-milling liquid and acid-controlled ball-milling slag; adding an extracting agent formed by mixing P204 and sulfonated kerosene into the acid-controlled ball-milling liquid, and extracting to obtain a manganese extracting liquid and a manganese raffinate; 2 mol/L sulfuric acid is added into the manganese extraction liquid for reverse extraction, and a manganese sulfate solution and a P204 organic phase are obtained; the manganese sulfate solution is subjected to evaporative crystallization, and high-purity manganese sulfate and crystallization mother liquor are obtained. The electrolytic manganese sulfide slag is continuously dissolved in the acid aqueous solution in the ball milling proc