Solvent extraction of nickel and cobalt by mixtures of carboxylic acids and non-chelating oximes

Add time:09/05/2019    Source:sciencedirect.com

The effect of non-chelating oximes on the solvent extraction of nickel(II) and cobalt(II) by solutions of carboxylic acids (H2A2) in xylene has been studied. Synergistic enhancements of extraction were found with aldoximes, but not with ketoximes. The synergistic effects are larger for nickel than for cobalt, with the result that the selectivities of the carboxylic acids for nickel over cobalt are considerably enhanced in the presence of aldoximes. The influence of the molecular structure of the oxime and carboxylic acid components upon the synergistic effects is rationalized in terms of the prevailing stereochemical and electronic effects. The extracted complexes were shown to be octahedral in structure, with the compositions NiA2(oxime)4 and CoA2(oxime)4.The mixed reagent systems may prove useful for the selective extraction of nickel in the presence of cobalt.

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