Abstract. Separation of cobalt and nickel from sulfate solutions was studied, using the sodium hypochlorite solution as the oxidant of Co 2+ . The cobalt removal rate reached 98% while Ni 2+ was hardly oxidized at 80˚C, 1h, pH 2.3 and Co 2+ /ClO -molar ratio of 1:15. Solution pH and the amount of ClO -had more significant influences on oxidation of Co 2+ and Ni 2+ . Increasing temperature could improve the filtration performance of the solid product. The Co 2+ oxidation product was CoOOH. Adding the sodium hypochlorite solution in more than one times could inhibit the Ni 2+ oxidation to NiOOH.
Abstract. The leaching of laterite containing high-magnesium content was investigated in this study. The results show that the acidity of the leach liquors from high pressure leaching of laterite containing high iron content is high enough for the leaching of high-magnesium laterite. After leaching at 70˚C, 60min and solid/liquor ratio of 10g ore/L leaching agent, the mineral containing high magnesium content was completely dissolved, and the iron minerals were essentially undissolved. The solution pH increased to 2.5 or above, which was suitable for the subsequent iron removal process.
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