Selective Removal on Fe2+-Mn2+/Cu2+-Zn2+ lons from Synthetic Sulphuric Acid Leach Solution Which Bear Resemblance to the Leach Liquor from Reduction Roasted Nickel Laterite

In oder to get the fundamental conditons on the removal of impurity of metallic ions such as Fe2+, Mn2+, Cu2+ and Zn2+ ions, synthetic sulphuric acid solution was used.NaCIO was used as oxidation reagent for Fe2+→Fe3+ and Mn2+→Mn4+. Selective optimum ORP was+1, 000-1, 150 mv, pH was 3.3-3.4 and oxidation temperature was 50-70°C for oxidation of Fe2+→Fe (OH)3 and Mn2+→MnO2 while Ni2+, Co2+, Cu2+ and Zn2+ ions were remained in the solution. After removal of Fe2+ and Mn2+ ions, as secondary stage, Cu2+ and Zn2+ ions were selectively sulphurized and precipiteted with H2 S while Ni2+ and Co2+ ions were remained in the solution. Selective optimum ORP was -130--140 mv and pH was 3.4-3.5.