Separation of Am and Cm by Extraction from Weakly Acidic Nitrate Solutions with Tributyl Phosphate in Isoparaffin Diluent
- Autores: Kulyako Y.M.1, Malikov D.A.1, Trofimov T.I.1, Vinokurov S.E.1, Pilyushenko K.S.1, Zevakin E.A.1, Myasoedov B.F.1
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Afiliações:
- Vernadsky Institute of Geochemistry and Analytical Chemistry
- Edição: Volume 60, Nº 1 (2018)
- Páginas: 18-22
- Seção: Article
- URL: https://ogarev-online.ru/1066-3622/article/view/224317
- DOI: https://doi.org/10.1134/S1066362218010034
- ID: 224317
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Resumo
Trivalent transplutonium (TPE) and rare earth (REE) elements are extracted to more than 80% with 30% TBP in Isopar M from solutions containing 0.06–0.5 M HNO3 and a salting-out agent, NH4NO3, in a concentration of ≥6 M. The elements are stripped from the organic phase with 0.1 M HNO3. The Am(III)/Eu separation factors vary from 1.8 to 2, which can be used for their extraction separation. The Cm/Am(III) separation factors in 0.06–3 M HNO3 are in the range from 1.1 to 1.2; therefore, to separate these elements, higher oxidation states of Am, Am(VI) and Am(V), should be used. The effect of various factors on the stability of Am(VI) was examined, and the conditions of the existence of Am(VI) and Am(V) in ≤0.1 M HNO3 solutions containing ~8 M NH4NO3 were determined. Curium is extracted with 30% TBP in Isopar M virtually completely, whereas americium only partially (≤30%) passes into the organic phase in the form of Am(III). In the process, high degree of separation of Cm from Am(V) remaining in the aqueous phase is reached (≥99.9%).
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Sobre autores
Yu. Kulyako
Vernadsky Institute of Geochemistry and Analytical Chemistry
Autor responsável pela correspondência
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
D. Malikov
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
T. Trofimov
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
S. Vinokurov
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
K. Pilyushenko
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
E. Zevakin
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
B. Myasoedov
Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: kulyako@geokhi.ru
Rússia, ul. Kosygina 19, Moscow, 119991
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