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Lanthanides extraction processes in molten fluoride media. Application to nuclear spent fuel reprocessing

Taxil, Pierre and Massot, Laurent and Nourry, Christophe and Gibilaro, Mathieu and Chamelot, Pierre and Cassayre, Laurent Lanthanides extraction processes in molten fluoride media. Application to nuclear spent fuel reprocessing. (2009) Journal of Fluorine Chemistry, vol. 130 (n°1). pp. 94-101. ISSN 0022-1139

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Official URL: http://dx.doi.org/10.1016/j.jfluchem.2008.07.004

Abstract

This paper describes four techniques of extraction of lanthanides elements (Ln) from molten salts in the general frame of reprocessing nuclear wastes; One of them is chemical: the precipitation of Ln ions in insoluble compounds (oxides or oxifluorides); the others use electrochemical methodology in molten fluorides for extraction and measurement of the progress of the processes: first electrodeposition of pure Ln metals on an inert cathode material was proved to be incomplete and cause problems for recovering the metal; electrodeposition of Ln in the form of alloys seems to be far more promising because on one hand the low activity of Ln shifts the electrodeposition potential in a more anodic range avoiding any overlapping with the solvent reduction and furthermore exhibit rapid process kinetics; two ways were examined: (i) obtention of alloys by reaction of the electroreducing Ln and the cathode in Ni or preferably in Cu, because in this case we obtain easily liquid compounds, that enhances sensibly the process kinetics; (ii) codeposition of Ln ions with aluminium ions on an inert cathode giving a well defined composition of the alloy. Each way was proved to give extraction efficiency close to unity in a moderate time.

Item Type:Article
Additional Information:This publication is available on http://www.sciencedirect.com/science/journal/00221139
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Laurent CASSAYRE
Deposited On:02 Jul 2009 20:25

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