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Solvent Extraction and Ion Exchange Volume 31, 2013 - Issue 4: Special Issue in Honor of Professor Gregory R. Choppin: Advances in Nuclear Separations
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Original Articles

Complete Recovery of Actinides from UREX-like Raffinates using a Combination of Hard and Soft Donor Ligands

Peter R. Zalupski Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
,
Dale D. Ensor Department of Chemistry, Tennessee Tech University, Cookeville, TN, USA
,
Catherine L. Riddle Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USA
&
Dean R. Peterman Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID, USACorrespondence[email protected]
Pages 430-441 | Published online: 24 Jul 2013
 
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Abstract

Studies have shown a much enhanced differentiation between trivalent actinides and trivalent lanthanides when substituted alkyl dithiophosphinic acids are utilized as the active phase transfer reagents. We present a study evaluating the use of a synergistic combination of bis(o-trifluoromethylphenyl)dithiophosphinic acid and trioctylphosphine oxide for the complete actinide recovery from UREX-like raffinates. A complete single-step separation of uranium, neptunium, plutonium, and americium from aqueous mixtures containing 0.5 M nitric acid and a total fission product content of 5.5 g/L (45 mM) has been demonstrated.

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