Potassium permanganate is a strong oxidizing agent, in mineral smelting (wet smelting process), potassium permanganate is added as an oxidizing agent, so that the divalent iron dissolved in the acid solution can be oxidized to the manganese.
In mineral smelting (wet smelting process), adding potassium permanganate as an oxidizing agent, the divalent iron dissolved in the acid solution is oxidized to trivalent, and divalent manganese is oxidized to tetravalent.