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

Abstract

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 HNO 3 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).

Authors:
 [1];  [1]
  1. Washington State Univ., Pullman, WA (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1245822
Report Number(s):
INL/JOU-15-34089
Journal ID: ISSN 0736-6299
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Solvent Extraction and Ion Exchange
Additional Journal Information:
Journal Volume: 33; Journal Issue: 7; Journal ID: ISSN 0736-6299
Publisher:
Taylor and Francis
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ALSPEAK; lanthanide; actinide; solvent extraction; Cyanex 923; HEH[EHP]

Citation Formats

Johnson, Aaron T., and Nash, Kenneth L. Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME. United States: N. p., 2015. Web. doi:10.1080/07366299.2015.1085225.
Johnson, Aaron T., & Nash, Kenneth L. Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME. United States. doi:10.1080/07366299.2015.1085225.
Johnson, Aaron T., and Nash, Kenneth L. Thu . "Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME". United States. doi:10.1080/07366299.2015.1085225. https://www.osti.gov/servlets/purl/1245822.
@article{osti_1245822,
title = {Mixed monofunctional extractants for trivalent actinide/lanthanide separations: TALSPEAK-MME},
author = {Johnson, Aaron T. and Nash, Kenneth L.},
abstractNote = {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).},
doi = {10.1080/07366299.2015.1085225},
journal = {Solvent Extraction and Ion Exchange},
number = 7,
volume = 33,
place = {United States},
year = {2015},
month = {8}
}

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