Abstract
The extraction of rare-earth (REE) and transplutonium (TPE) elements, with Ce, Eu, and Am as examples, from aqueous HNO3 with dibutyl hydrogen phosphate (HDBP) in m-nitrobenzotrifluoride (MNBTF) was studied. The diluent effect on the Eu and Am extraction with dibutyl hydrogen phosphate was examined at various HNO3 concentrations in the aqueous phase. Based on the data obtained, a mechanism of REE extraction was suggested and the parameters of extraction equations for the initial lanthanide concentrations in the aqueous phase from 0.1 to 100 g l−1 (counting on metal), HDBP concentration in MNBTF of 0.1–2 M, and HNO3 concentration in the range 0.5–8 M were calculated. Isotherms of HNO3 extraction with HDBP solutions of various concentrations were obtained. The possibility of attaining higher concentrations of REE solvates in their extraction with HDBP in MNBTF was demonstrated.
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