Direct Selective Extraction of Actinides (III) from PUREX Raffinate using a Mixture of CyMe4BTBP and TODGA as 1-cycle SANEX Solvent Part III: Demonstration of a Laboratory-Scale Counter-Current Centrifugal Contactor Process

Wilden, Andreas, Modolo, Giuseppe, Schreinemachers, Christian, Sadowski, Fabian, Lange, Steve, Sypula, Michal, Magnusson, Daniel, Geist, Andreas, Lewis, Frank, Harwood, Laurence and Hudson, Michael (2013) Direct Selective Extraction of Actinides (III) from PUREX Raffinate using a Mixture of CyMe4BTBP and TODGA as 1-cycle SANEX Solvent Part III: Demonstration of a Laboratory-Scale Counter-Current Centrifugal Contactor Process. Solvent Extraction and Ion Exchange, 31 (5). pp. 519-537. ISSN 0736-6299

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Abstract

The direct selective separation of the trivalent actinides americium and curium from a simulated PUREX raffinate solution by a continuous counter-current solvent extraction process using miniature annular centrifugal contactors was demonstrated on a laboratory scale. In a 32-stage spiked test (12 stages for extraction, 16 stages for scrubbing, and 4 stages for Am/Cm stripping), an extractant mixture of CyMe4BTBP and TODGA in a TPH/1-octanol mixture was used. The co-extraction of some fission and corrosion product elements, such as zirconium and molybdenum, was prevented by using oxalic acid. Co-extracted palladium was selectively stripped using an L-cysteine scrubbing solution and the trivalent actinides were selectively stripped using a glycolic acid-based stripping solution. It was demonstrated that a selective extraction and high recovery of >99.4% of the trivalent minor actinides was achieved with low contamination by fission and corrosion products. The product contained 99.8% of the initial americium and 99.4% of the initial curium content. The spent solvent still contained high concentrations of Cu, Cd and Ni. The experimental steady-state concentration profiles of important solutes were determined and compared with those from computer-code calculations.

Item Type:	Article
Uncontrolled Keywords:	SANEX, CyMe4BTBP, TODGA, Americium, curium, solvent extraction process
Subjects:	F100 Chemistry
Department:	Faculties > Health and Life Sciences > Applied Sciences
Depositing User:	Ellen Cole
Date Deposited:	27 Mar 2013 12:29
Last Modified:	12 Oct 2019 18:27
URI:	http://nrl.northumbria.ac.uk/id/eprint/11721

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