Oxidative precipitation of manganese with SO2/O2 and separation from cobalt and nickel
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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.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Copyright:||© 2002 Elsevier Science B.V.|
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