Analysis of the back-extraction of cadmium-nickel-D2EHPA organic phases

In this work the back-extraction reaction and equilibrium parameter of organic phases containing Cd, Ni, and di(2-ethylhexyl)phosphoric acid (D2EHPA) are presented. Using sulphuric acid solution as stripping agent, this study is part of the analysis of the integral separation process of Cd and Ni ac...

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Bibliographic Details
Published in:Separation science and technology 2002-01, Vol.37 (3), p.607-625
Main Authors: Ortiz, Inmaculada, Fresnedo San Román, M.
Format: Article
Language:English
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Summary:In this work the back-extraction reaction and equilibrium parameter of organic phases containing Cd, Ni, and di(2-ethylhexyl)phosphoric acid (D2EHPA) are presented. Using sulphuric acid solution as stripping agent, this study is part of the analysis of the integral separation process of Cd and Ni acidic mixtures by means of non-dispersive solvent extraction. Discrimination of different back-extraction mechanisms was achieved from the comparison of kinetic results to simulated data with a previously-reported mathematical model. Finally, it was concluded that the formation of the organic complex species is responsible for the back-extraction of both metals with the equilibrium parameter
ISSN:0149-6395
1520-5754
DOI:10.1081/SS-120001450