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AbstractAbstract
[en] The TALSPEAK Process, as developed by Weaver and Kappelmann at Oak Ridge National Laboratory in the 1960's, is a well established approach to accomplishing the difficult task of separating trivalent actinides from lanthanides. This separation is essential for fuel cycles that incorporate actinide transmutation, as several lanthanides compete strongly for neutrons needed for actinide transmutation. Under ideal conditions conventional TALSPEAK (0.5-1.0 M HDEHP, 0.05-0.1 M DTPA, 0.5-2.0 M lactate buffer operating at pH 3.5) achieves a very respectable lanthanide/actinide group separation factor of 100. Conventional TALSPEAK has not yet found application at production scale because the process exhibits, 1) a surprisingly steep (unexpected and undesirable) pH dependence, and 2) complex (and comparatively slow) phase transfer kinetics. The slow phase transfer kinetics is partially overcome by operating from lactate buffers of unusually high concentration, but recent studies indicate that high lactate concentrations amplify the pH dependence issues. As a result of this increased understanding, TALSPEAK research has evolved toward the consideration of alternative extractants (or extractant mixtures), actinide holdback reagents, and buffers. In this report, selected features of investigations into the Advanced TALSPEAK process (featuring a weaker phosphonic acid extractant matched to weaker complexants and less concentrated buffer solutions than Conventional TALSPEAK), new di-picolinate-based holdback reagents (as alternatives to DTPA), and a combined-process concept (TALSPEAK-MME - Mixed Monofunctional Extractants) are discussed. (authors)
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Societe Francaise d'Energie Nucleaire - SFEN, 103 rue Reaumur, 75002 Paris (France); 2455 p; ISBN 978-1-4951-6286-2; ; 2015; p. 1677-1683; GLOBAL 2015: Nuclear fuel cycle for a low-carbon future; Paris (France); 21-24 Sep 2015; Available (USB stick) from: SFEN, 103 rue Reaumur, 75002 Paris (France); 27 refs.
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Conference
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