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Oxidative precipitation of manganese with SO2/O2 and separation from cobalt and nickel

Zhang, W., Singh, P. and Muir, D. (2002) Oxidative precipitation of manganese with SO2/O2 and separation from cobalt and nickel. Hydrometallurgy, 63 (2). pp. 127-135.

Link to Published Version: http://dx.doi.org/10.1016/S0304-386X(01)00205-5
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Abstract

The oxidation of Mn(II) and precipitation as MnO2/Mn2O3occurs spontaneously using SO2/O2 gas mixtures in the pH range 1-6 and temperature range 25-80 °C. The rate of Mn(II) oxidation with SO2/O2 is first order with respect to SO2 partial pressure up to 5.7% SO2 at 80 °C and half order with respect to [H+]. The rate of oxidation of Mn(II) is slow at pH<3 and increases rapidly at pH>4. Any Fe(II) is oxidised and precipitated before Mn(II). Low concentrations of manganese (0.01 M) can be selectively oxidised and precipitated from cobalt and nickel solutions at pH 3-4 with less than 1% co-precipitation of cobalt and nickel in the laboratory batch tests. The selectivity of manganese precipitation at pH 3-4 is consistent with thermodynamic data for the Mn-Ni/Co-H2O systems.

Item Type: Journal Article
Murdoch Affiliation: School of Mathematical and Physical Sciences
Publisher: Elsevier BV
Copyright: © 2002 Elsevier Science B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/16766
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