Separation of Am and Cm by Extraction from Weakly Acidic Nitrate Solutions with Tributyl Phosphate in Isoparaffin Diluent View Full Text


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Article Info

DATE

2018-01

AUTHORS

Yu. M. Kulyako, D. A. Malikov, T. I. Trofimov, S. E. Vinokurov, K. S. Pilyushenko, E. A. Zevakin, B. F. Myasoedov

ABSTRACT

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%). More... »

PAGES

18-22

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1066362218010034

DOI

http://dx.doi.org/10.1134/s1066362218010034

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1101386792


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