日本金属学会誌

J. Japan Inst. Metals, Vol. 57, No. 11 (1993),
pp. 1281-1287

Solvent Extraction of Cobalt and Sodium with Versatic Acid 10

Kuniomi Wase1, Yosuke Kishi1 and Yoichi Maru2

1Department of Materials Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama
2Department of Mining Engineering, The Papua New Guinea University of Technology, Lae

Abstract:

Extraction behavior of cobalt and sodium (abbreviated to Co(II) and Na, respectively) with Versatic Acid 10(abbreviated to VA10 and its chemical formula is abbreviated to RH) was investigated by experimentally obtaining phase equilibria in the VA10--Co(NO3)2--NaOH--H2O system and in the VA10--Co(NO3)2--H2O system at 298 K. The results obtained are as follows.
The distribution ratio of Co(II) is very small in the case of VA10--Co(NO3)2--H2O system. In the case of the VA10--Co(NO3)2--NaOH--H2O system, on the other hand, Co(II) is preferentially extracted to Na in the narrow pH region. After the extraction of Co(II) is completed, Na starts to be extracted as pH value becomes higher. Extracted species of Na can be identified as RNa and that of Co(II) is inferred to be either in the form of monomer or dimer. The extractant, RH is hardly dissolved in the aqueous phase in the pH region in which the extraction of Co(II) is dominant. On the contrary, in the pH region in which the extraction of Na becomes dominant, the RH concentration in the aqueous phase rapidly increases. Based on the results thus obtained, the solubility surface and tie lines between organic and aqueous phases were constructed on a composition tetrahedron of the RH--Co(II)-Na--H2O simplified system. It is shown that an overview of extraction behavior of Co(II) and Na with RH can synthetically be understood from this composition tetrahedron.


(Received May 26, 1993)

Keywords:

Versatic Acid 10, solvent extraction, phase equilibrium, immiscibility gap, solubility of cobalt, solubility of sodium, distribution ratio of cobalt, distribution ratio of sodium


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