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Coextraction and successive selective stripping of cerium(IV) and thorium from monazite leach solutions with tributyl phosphate (TBP)

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Abstract

Solvent extraction of Ce(IV) and Th(IV) from 8 M HNO3 with TBP in kerosene was studied. The dependence of the extraction on the TBP concentration, kind of diluent, O/A phase ratio, and contact time was examined. The extraction efficiency reaches 99.3 and 97.7% for Ce and Th, respectively, at 5% TBP in kerosene, 1/1 O/A phase ratio, and 5 min contact time. Successive selective stripping of Ce(III) and Th(IV) from the loaded organic phase was reached at 1.1 M H2O2 concentration, 10 min contact time, 3/1 O/A phase ratio, and room temperature (25 ± 2°C). After stripping of cerium, the remaining organic was contacted with H2O for thorium stripping at 5 min contact time, 2/1 O/A phase ratio, and room temperature (25 ± 2°C).

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Authors and Affiliations

  1. Nuclear Materials Authority, P.O. Box 530, Maadi, Cairo, Egypt

    A. H. Ali

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  1. A. H. Ali
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Correspondence to A. H. Ali.

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Published in Russian in Radiokhimiya, 2017, Vol. 59, No. 6, pp. 510–516.

The text was submitted by the author in English.

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Ali, A.H. Coextraction and successive selective stripping of cerium(IV) and thorium from monazite leach solutions with tributyl phosphate (TBP). Radiochemistry 59, 579–586 (2017). https://doi.org/10.1134/S10663622170600054

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  • DOI: https://doi.org/10.1134/S10663622170600054

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