Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME

Johnson, Aaron T.; Nash, Kenneth L.

doi:10.1080/07366299.2015.1085225

Title: Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME

Journal Article · Thu Aug 20 00:00:00 EDT 2015 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299.2015.1085225· OSTI ID:1245822

Johnson, Aaron T. ^[1]; Nash, Kenneth L. ^[1]

Washington State Univ., Pullman, WA (United States)

The basic features of an f-element extraction process based on a solvent composed of equimolar mixtures of Cyanex-923 (a mixed trialkyl phosphine oxide) and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) extractants in n-dodecane are investigated in this report. This system, which combines features of the TRPO and TALSPEAK processes, is based on co-extraction of trivalent lanthanides and actinides from 0.1 to 1.0 M HNO₃ followed by application of a buffered aminopolycarboxylate solution strip to accomplish a Reverse TALSPEAK selective removal of actinides. This mixed-extractant medium could enable a simplified approach to selective trivalent f-element extraction and actinide partitioning in a single process. As compared with other combined process applications in development for more compact actinide partitioning processes (DIAMEX-SANEX, GANEX, TRUSPEAK, ALSEP), this combination features only monofunctional extractants with high solubility limits and comparatively low molar mass. Selective actinide stripping from the loaded extractant phase is done using a glycine-buffered solution containing N-(2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA) or triethylenetetramine-N,N,N',N'',N''',N'''-hexaacetic acid (TTHA). Lastly, the results reported provide evidence for simplified interactions between the two extractants and demonstrate a pathway toward using mixed monofunctional extractants to separate trivalent actinides (An) from fission product lanthanides (Ln).

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1245822

Report Number(s):: INL/JOU-15-34089

Journal Information:: Solvent Extraction and Ion Exchange, Vol. 33, Issue 7; ISSN 0736-6299

Publisher:: Taylor and FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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