Abstract
Manganese recoveries from low-grade ores using organic acids as reducing agents were investigated in the present work. The acid leaching potential of both oxalic acid and citric acid were estimated. Manganese leaching amount were measured by using standard manganese curve and estimated by titration method. Effects of various acid concentrations on leaching efficiency were studied. The observed result suggested prominent manganese recovery of 66% by oxalic acid at 2 M concentration whereas citric acid had less effect on leaching showing leaching percentage upto 40% in 6 days. Acid leaching of manganese ore with both the acids gave a comparative data stating that oxalic acid leached better than citric acid.
Highlights
Manganese is the 12th most abundant element comprising about 0.10% of the earth’s crust, with oxidation states existing in from –3 to +7
Our study investigated the leaching efficiency of citric acid (C6H8O7) and oxalic acid (C2H2O4) with different concentrations (0.1 M, 0.25 M, 0.5 M, 1 M, 2 M) and low grade manganese ore with pulp density 2% for 6 days
Our study on acid leaching of Manganese ore with Oxalic acid and Citric acid gives a comparative data about leaching, which shows that oxalic acid has a better leaching potential than citric acid
Summary
Manganese is the 12th most abundant element comprising about 0.10% of the earth’s crust, with oxidation states existing in from –3 to +7. The oxides and peroxides of manganese are used for manufacturing metal alloys to increase hardness and for enhancement of alloy to be corrosion resistance and as a desulfurizing, deoxidizing element in various industrial processes [2,3]. Various studies have been carried out for leaching of low grade manganese ore using sulphuric acid and oxalic acid [6,7], nitric acid [8], hydrochloric acid and citric acid [9] as reducing agent and high leaching efficiency, but the basic problem are the high temperature, residual acid generation, associated cost and environmental pollution [10]. Our study investigated the leaching efficiency of citric acid (C6H8O7) and oxalic acid (C2H2O4) with different concentrations (0.1 M, 0.25 M, 0.5 M, 1 M, 2 M) and low grade manganese ore with pulp density 2% for 6 days
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