How pure is manganese made by the electrolytic process?

Manganese produced through the electrolytic process reaches a purity level of greater than 99.9 percent.1

During this process, manganese ores are roasted and dissolved in sulfuric acid to create a manganous sulfate solution, which is then purified to remove impurities such as iron, aluminum, and various heavy metals. The solution is fed into an electrolytic cell, where the metal is deposited onto a stainless-steel cathode. After the resulting manganese flakes are heated to 500 °C (925 °F) to remove hydrogen, the final product achieves its high-purity powdered form.1