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Flow sheet for recovery of Mn values from Mn sludge, a by-product obtained during processing of the Mn nodules through ammonia–ammonium sulphate–sulphur dioxide leaching process route as Electrolytic Manganese Dioxide (EMD) was developed. The unit operations include dissolution of Mn sludge with sulphuric acid in presence of activated charcoal, purification of liquor in two stages—removal of Fe by...
Electrolytic manganese dioxide (EMD) was prepared from manganese cake, which is an oxide material and byproduct obtained during processing of manganese nodules. Manganese cake dissolution was carried out in sulfuric acid media using waste newspaper as a reductant. In the two-stage purification of leach liquor iron was initially removed by pH adjustment using lime slurry followed by sulfide precipitation...
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