Add time:08/25/2019         Source:sciencedirect.com

A hydrometallurgical process is proposed in this paper to recover manganese from Silicomanganese (cas 12743-28-1) slag. The paper reports the digestion–leaching experiments and precipitation and electrowinning assays to recover Mn from this residue. Silicomanganese slag was first treated with sulfuric acid in a furnace at 200 °C. It was then leached with water, CaO and KOH, and finally filtered to dissolve the manganese. Sulfuric liquor needs a purification step in order to remove Zn, Ni, Co and Cu. Na2S was used to remove pollutants, a 5% excess with respect to the stoichiometric amounts of sulfide required for the reaction being employed for this purpose. The purified liquor is suitable for electrolysis. α-manganese is obtained with a purity of 99.99.

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