期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 274, 期 -, 页码 360-366出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.04.023
关键词
Nuclear fuel cycle; Actinide separations; Supercritical fluid extraction; High level waste
资金
- INL-LDRD Program [DE-AC07-05ID14517]
The feasibility of separating U from nitric acid solutions of mixed actinides using tri-n-butylphosphate (TBP)-modified supercritical fluid carbon dioxide (sc-CO2) was investigated. The actinides U, Np, Pu, and Am were extracted into sc-CO2 modified with TBP from a range of nitric acid concentrations, in the absence of, or in the presence of, a number of traditional reducing and/or complexing agents to demonstrate the separation of these metals from U under sc-CO2 conditions. The separation of U from Pu using sc-CO2 was successful at nitric acid concentrations of less than 3M in the presence of acetohydroxamic acid (AHA) or oxalic acid (OA) to mitigate Pu extraction, and the separation of U from Np was successful at nitric acid concentrations of less than 1 M in the presence of AHA, OA, or sodium nitrite to mitigate Np extraction. Americium was not well extracted under any condition studied. (C) 2014 Elsevier B.V. All rights reserved.
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