The production of electrolytic manganese involves several key steps, including ore processing, leaching, purification, electrolysis, and final processing.
1. Manganese Ore Preparation
Raw Material: Manganese carbonate or manganese oxide ores are used as the primary raw materials.
Crushing and Grinding: The ore is crushed and ground into fine particles to increase the surface area for chemical reactions.
2. Acid Leaching
The ground manganese ore is mixed with sulfuric acid (H₂SO₄) in a leaching tank.
Reaction:
MnO2+H2SO4→MnSO4+H2OMnO_2 + H_2SO_4 → MnSO_4 + H_2OMnO2+H2SO4→MnSO4+H2O
This process dissolves manganese into a sulfate solution, separating it from impurities.
3. Purification
The manganese sulfate solution undergoes impurity removal to eliminate iron, aluminum, and other unwanted metals.
Common purification methods include:
Oxidation-Reduction: Adjusting pH and adding oxidizing agents to remove iron.
Precipitation: Removing calcium and magnesium impurities by adding chemical reagents.
4. Electrolysis
The purified manganese sulfate solution is fed into an electrolytic cell containing cathodes (stainless steel) and anodes (lead alloy).
A DC electric current is applied, causing manganese ions to deposit onto the cathode as metallic manganese.
The deposited manganese forms thin flakes, which are later collected.
5. Washing and Drying
The electrolytic manganese flakes are removed from the cathodes.
They are washed with clean water to remove residual acids and impurities.
The flakes are then dried and packed for storage or transportation.
Final Product
Purity: Electrolytic manganese flakes typically have a purity of 99.7% - 99.9% Mn.
Form: Silver-gray metallic flakes, ready for use in steel production, battery manufacturing, and chemical applications.
