Separation of cobalt and nickel from sulfate media using P507-N235 system |
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| Authors: | Kui Liu Hua Long Yan Wang Xiaomeng Tang |
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| Affiliation: | 1. School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin 541004, China;2. Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi Normal University, Guilin 541004, China |
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| Abstract: | Separation of cobalt and nickel from sulfate media was investigated, using a extraction system of 30% 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507)+15% trioctyl/decylamine (N235)+55% sulfonated kerosene. About 41 wt% Co2+ was extracted with 1.6 wt% co-extraction of Ni2+ at O/A ratio of 2:1. Scrubbing of Ni2+ and stripping of Co2+ could be achieved from the loaded organic phase, using water and 0.05 mol/L H2SO4, respectively. Cobalt extraction percentage decreased with increasing Mg2+ concentration, but this influence was negligible as Mg2+] < 0.1g/L. The favorable equilibrium pH was 4–4.8. A different E-pH curve was observed in the P507-N235 system compared to the saponified P507 system. |
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| Keywords: | Cobalt extraction nickel magnesium P507-N235 system |
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