| Title |
Precipitation-Stripping of Cobalt Extracted in Cyanex 272 by Oxalic Acid |
| Authors |
박경호(Kyung Ho Park); 정선희(Sun Hee Jung); 신선명(Shun Myung Shin); 김동수(Dong Su Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Solvent extraction; Cobalt; Cyanex 272; Precipitation-stripping; Oxalic acid |
| Abstract |
This paper presents the precipitation-stripping of cobalt from cobalt-loaded solvent (Cyanex 272 in kerosene) into an aqueous oxalate solution, where cobalt was precipitated as metal oxalate. The loaded solvent containing 2 g/ℓ cobalt was selected. The precipitation yield was tested as a function of several parameters such as pH of aqueous solution, the amount of oxalic acid, O/A ratio, temperature, and reaction time. The precipitation yield of cobalt greatly depended on pH of aqueous solution, and pH of 1.5 was optimum. Under optimum precipitation-stripping conditions (pH-1.5, oxalic acid-2 times of cobalt, O/A ratio-3, 25℃, 20 min.) about 95% efficiency was achieved. |