Hexavalent Americium recovery using Copper(III) periodate [electronic resource].
- Washington, D.C. : United States. Office of the Assistant Secretary for Nuclear Energy, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 11,971-11,978 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory, United States. Office of the Assistant Secretary for Nuclear Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Separation of americium from the lanthanides is considered one of the most difficult separation steps in closing the nuclear fuel cycle. One approach to this separation could involve oxidizing americium to the hexavalent state to form a linear dioxo cation while the lanthanides remain as trivalent ions. This work considers aqueous soluble Cu<sup>3+</sup> periodate as an oxidant under molar nitric acid conditions to separate hexavalent Am with diamyl amylphosphonate (DAAP) in n-dodecane. Initial studies assessed the kinetics of Cu<sup>3+</sup> periodate autoreduction in acidic media to aid in development of the solvent extraction system. Following characterization of the Cu<sup>3+</sup> periodate oxidant, solvent extraction studies optimized the recovery of Am from varied nitric acid media and in the presence of other fission product, or fission product surrogate, species. Short aqueous/organic contact times encouraged successful recovery of Am (distribution values as high as 2) from nitric acid media in the absence of redox active fission products. In the presence of a post-plutonium uranium redox extraction (post-PUREX) simulant aqueous feed, precipitation of tetravalent species (Ce, Ru, Zr) occurred and the distribution values of <sup>241</sup>Am were suppressed, suggesting some oxidizing capacity of the Cu<sup>3+</sup> periodate is significantly consumed by other redox active metals in the simulant. Furthermore, the manuscript demonstrates Cu<sup>3+</sup> periodate as a potentially viable oxidant for Am oxidation and recovery and notes the consumption of oxidizing capacity observed in the presence of the post-PUREX simulant feed will need to be addressed for any approach seeking to oxidize Am for separations relevant to the nuclear fuel cycle.
- Published through SciTech Connect., 10/31/2016., "AF5805010", "NEAF315", Inorganic Chemistry 55 22 ISSN 0020-1669 AM, and Kevin McCann; Derek M. Brigham; Samuel Morrison; Jenifer C. Braley.
- Funding Information:
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