Abstract
A study of the solvent extraction equilibria of sulphuric acid and uranyl sulphate has been carried out using kerosene solutions of Alamine 336. In previous studies involving tertiary amines, it has not been possible to describe the reactions involved on the basis of mass action. A theory based on “competing” reactions and using mass action has been proposed to describe, semi-quantitatively, the observed trends in distribution ratio with pH and organic reagent concentration. In particular, it has been possible to reconcile the exponential dependence of U(VI) distribution ratio on the amine sulphate concentration with the apparent ratio of amine to uranium(VI) in the extracted species.
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