Abstract
Uranium is extracted very rapidly from phosphoric acid solutions by octyl pyro phosphoric acid diluted with n-hexan. From dilute phosphoric acid solutions, high distribution coefficients are observed, whereas from concentrated solutions low distribution coefficients. Decreasing the hydrogen ion concentration from equally concentrated phosphate solutions increases greatly the distribution coefficients. These facts as well as the other experimental results, as changing the distribution coefficient by changing the phosphoric acid concentration and the uranium concentration in the aqueous phase, or through changing the quantity of the solvent are thoroughly discussed. The different factors influencing the distribution coefficients are attributed to the different uranyl phosphate complexes existing in the aqueous phase with respect to the pH and the phosphoric acid concentration, and a complex between the uranyl ion and the solvent in the organic phase.
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