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Article

Countercurrent Actinide Lanthanide Separation Process (ALSEP) Demonstration Test with a Simulated PUREX Raffinate in Centrifugal Contactors on the Laboratory Scale

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Forschungszentrum Jülich GmbH, Institut für Energie–und Klimaforschung–Nukleare Entsorgung und Reaktorsicherheit (IEK-6), 52428 Jülich, Germany
2
Nuclear Chemistry and Engineering Group, Pacific Northwest National Laboratory, Richland, WA 99352, USA
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Department of Chemistry and Biochemistry, Radiochemistry Program, University of Nevada, Las Vegas, NV 89101, USA
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Aqueous Separations and Radiochemistry Department, Idaho National Laboratory, Idaho Falls, ID 83415, USA
5
Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(20), 7217; https://doi.org/10.3390/app10207217
Received: 4 September 2020 / Revised: 9 October 2020 / Accepted: 13 October 2020 / Published: 16 October 2020
(This article belongs to the Special Issue Nuclear Wastes Management)
An Actinide Lanthanide Separation Process (ALSEP) for the separation of trivalent actinides (An(III)) from simulated raffinate solution was successfully demonstrated using a 32-stage 1 cm annular centrifugal contactor setup. The ALSEP solvent was composed of a mixture of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) and N,N,N′,N′-tetra-(2-ethylhexyl)-diglycolamide (T2EHDGA) in n-dodecane. Flowsheet calculations and evaluation of the results were done using the Argonne’s Model for Universal Solvent Extraction (AMUSE) code using single-stage distribution data. The co-extraction of Zr(IV) and Pd(II) was prevented using CDTA (trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid) as a masking agent in the feed. For the scrubbing of co-extracted Mo; citrate-buffered acetohydroxamic acid was used. The separation of An(III) from the trivalent lanthanides (Ln(III)) was achieved using citrate-buffered diethylene-triamine-N,N,N′,N″,N″-pentaacetic acid (DTPA), and Ln(III) were efficiently back extracted using N,N,N′,N′-tetraethyl-diglycolamide (TEDGA). A clean An(III) product was obtained with a recovery of 95% americium and curium. The Ln(III) were efficiently stripped; but the Ln(III) product contained 5% of the co-stripped An(III). The carryover of Am and Cm into the Ln(III) product is attributed to too few actinide stripping stages, which was constrained by the number of centrifugal contactors available. Improved separation would be achieved by increasing the number of An strip stages. The heavier lanthanides (Pr, Nd, Sm, Eu, and Gd) and yttrium were mainly routed to the Ln product, whereas the lighter lanthanides (La and Ce) were mostly routed to the raffinate. View Full-Text
Keywords: actinide separation; ALSEP; HEH[EHP]; PC88A; T2EHDGA; TEDGA; AMUSE actinide separation; ALSEP; HEH[EHP]; PC88A; T2EHDGA; TEDGA; AMUSE
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MDPI and ACS Style

Wilden, A.; Kreft, F.; Schneider, D.; Paparigas, Z.; Modolo, G.; Lumetta, G.J.; Gelis, A.V.; Law, J.D.; Geist, A. Countercurrent Actinide Lanthanide Separation Process (ALSEP) Demonstration Test with a Simulated PUREX Raffinate in Centrifugal Contactors on the Laboratory Scale. Appl. Sci. 2020, 10, 7217. https://doi.org/10.3390/app10207217

AMA Style

Wilden A, Kreft F, Schneider D, Paparigas Z, Modolo G, Lumetta GJ, Gelis AV, Law JD, Geist A. Countercurrent Actinide Lanthanide Separation Process (ALSEP) Demonstration Test with a Simulated PUREX Raffinate in Centrifugal Contactors on the Laboratory Scale. Applied Sciences. 2020; 10(20):7217. https://doi.org/10.3390/app10207217

Chicago/Turabian Style

Wilden, Andreas, Fabian Kreft, Dimitri Schneider, Zaina Paparigas, Giuseppe Modolo, Gregg J. Lumetta, Artem V. Gelis, Jack D. Law, and Andreas Geist. 2020. "Countercurrent Actinide Lanthanide Separation Process (ALSEP) Demonstration Test with a Simulated PUREX Raffinate in Centrifugal Contactors on the Laboratory Scale" Applied Sciences 10, no. 20: 7217. https://doi.org/10.3390/app10207217

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