Preparation method of special electrolytic manganese dioxide for button/manganese dioxide battery

The invention belongs to the field of processing of battery materials, and in particular relates to a preparation method of special electrolytic manganese dioxide for a button/manganese dioxide battery. The preparation method comprises the following steps: leaching by using manganese sulfate, neutralizing to remove iron, removing heavy metal impurities, electrolyzing and post-processing. Specifically, the preparation method comprises the following steps that manganese oxide mineral powder and pyrite powder are dipped in industrial sulfuric acid in the presence of SO2 to prepare crude manganese sulfate solution, iron is removed by using ammonium bicarbonate solution, the heavy metals are removed by using a sulfide mixture, a manganese dioxide semi-finished product is obtained at positive pole by periodic electrolysis, and the special electrolytic manganese dioxide for the button/manganese dioxide battery is finally obtained by post-processing. By adopting the preparation method, the production process is simpl