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Title: Mn recovery from medium grade ore using a waste cellulosic reductant
Authors: Hariprasad, D
Dash, B
Ghosh, M K
Anand, S
Keywords: Manganese ore
Leaching
Cellulosic reductant
Waste newspaper
Issue Date: Jul-2009
Publisher: CSIR
Abstract:  Medium grade siliceous manganese ore containing 38.22% Mn was leached in sulphuric acid medium using shredded newspaper as reducing agent. Objective of the present study was to investigate the effectiveness of ligno-cellulosic base wastes such as used newspaper as a reducing agent. The experimental parameters chosen for this study were: H2SO4 concentration (2-5% v/v), temperature (60-90oC), reductant to ore ratio (0.4-1) and ore particle size (57 – 274 µm). Optimum conditions for >90% extraction were: 90oC, 5% H2SO4 (v/v), reductant to ore ratio 0.5, 8 h, 10% pulp density and ore particle size -100 m. Newspaper was found to be equally effective as a reducing agent for low grade ore (15.83% Mn) also wherein the amount of reductant and acid needed were proportional to Mn content of the ore. The leach solution was enriched to 87 g/L by recycling process. The enriched solution was purified by pH adjustment to 4.7 using 20% lime slurry. MnSO4.H2O was crystallized from purified solution. A schematic flow-sheet has been included.
Page(s): 322-327
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.16(4) [July 2009]

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