Preparation method of electrolytic manganese dioxide for low-potassium low-sodium lithium manganate

The invention discloses a preparation method of electrolytic manganese dioxide for low-potassium low-sodium lithium manganate. The method comprises the following steps: carrying out a combination reaction on wastewater and waste liquid generated in the preparation process of electrolytic manganese dioxide, manganese carbonate powder and sulfuric acid to prepare a solution, removing potassium, sodium and iron elements accompanied by acidolysis of raw materials by utilizing the principles of yellow potassium iron vanadium and yellow sodium iron vanadium in a high-temperature acidic environment in the solution preparation process, neutralizing, and carrying out solid-liquid separation to obtain a crude manganese sulfate solution; purifying and removing various harmful heavy metals in three steps, electrolyzing to obtain an electrolytic manganese dioxide semi-finished product, rinsing, grinding and magnetizing by using manganese hydroxide as a neutralizer to remove elemental iron, uniformly mixing, and packaging