Removal of Phosphorus and Enrichment of Manganese From a ComplexFerruginous Manganese Ore
1998
Attempts were made to enrich manganese content as well as Mn/Fe ratio from a complex
manganese ore from Nishikhal deposit, Orissa, India, containing 32% Mn, 18% Fe, 16%
SiO 2, 21% acid insolubles and 0.45% P by reduction roasting followed by magnetic
separation route. Interestingly the adopted route not only enriched the Mn content to
around 40%, Mn/Fe ratio to around 10 but also brought down the P to around 0.3% in the
non-magnetic product there by making this deposit as a potential feed for ferro-manganese
production in the country. Although the enrichment of Mn and Mn/Fe ratio is
expected by this route, 60% of the phosphorus reduction is primarily due to the presence of
P in association with goethite while the rest of the P was observed to be associated with the
manganese phases and as apatite within the silicate phases as confirmed by the optical
microscope and electron microscopic studies. The paper also discusses the limitation of
reducing the P content further in the beneficiated product.
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