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Vol.42, No.11, 947 ~ 952, 2004
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| Title |
| Solvent Extraction of Cobalt by Cyanex 272 from Sulfuric Acid Solution Containing Nickel and Cobalt |
| 박경호 Kyung Ho Park , 정선희 Sun Hee Jung , 남철우 Chul Woo Nam , 신선명 Shun Myung Shin , 김동수 Dong Su Kim |
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| Abstract |
| The solvent extraction to separate and recover cobalt and nickel from sulfuric acid solution was studied using Cyanex 272 in kerosene. The solution processed was equivalent to that expected from leaching of a matte, intermediate product of manganese nodules. The extraction of both metals increased with increasing equilibrium pH and extractant concentration. However, cobalt was preferentially extracted over nickel. The extraction efficiencies of cobalt and nickel were 80% and 1.9% respectively with 0.2M Cyanex and O/A of 1 at equilibrium pH 5.0. The separation factor of Co/Ni increased with raising the extraction temperature (205 at 20℃, and at 441 at 50℃). The saponification of Cynanex 272 increased the extraction of cobalt due to the increase of equilibrium pH. Nickel (0.40 g/l) loaded in an organic phase could be scrubbed with a solution containing 10 g/l Co at equilibrium pH of 6.0. The stage numbers and cobalt recoveries in extraction and stripping processes required for the counter current operations are predicted using the equilibrium isotherm plots. (Received May 19, 2004) |
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| Key Words |
| Solvent extraction, Cyanex 272, Cobalt, Nickel, Scrubbing, Stripping, Manganese nodules, Leaching solution |
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