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http://dx.doi.org/10.1016/j.net.2019.06.025

Reprocessing of fluorination ash surrogate in the CARBOFLUOREX process  

Boyarintsev, Alexander V. (Dmitry Mendeleev University of Chemical Technology of Russia)
Stepanov, Sergei I. (Dmitry Mendeleev University of Chemical Technology of Russia)
Chekmarev, Alexander M. (Dmitry Mendeleev University of Chemical Technology of Russia)
Tsivadze, Aslan Yu. (A.N. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences)
Publication Information
Nuclear Engineering and Technology / v.52, no.1, 2020 , pp. 109-114 More about this Journal
Abstract
This work presents the results of laboratory scale tests of the CARBOFLUOREX (CARBOnate FLUORide EXtraction) process - a novel technology for the recovery of U and Pu from the solid fluorides residue (fluorination ash) of Fluoride Volatility Method (FVM) reprocessing of spent nuclear fuel (SNF). To study the oxidative leaching of U from the fluorination ash (FA) by Na2CO3 or Na2CO3-H2O2 solutions followed by solvent extraction by methyltrioctylammonium carbonate in toluene and purification of U from the fission products (FPs) impurities we used a surrogate of FA consisting of UF4 or UO2F2, and FPs fluorides with stable isotopes of Ce, Zr, Sr, Ba, Cs, Fe, Cr, Ni, La, Nd, Pr, Sm. Purification factors of U from impurities at the solvent extraction refining stage reached the values of 104-105, and up to 106 upon the completion of the processing cycle. Obtained results showed a high efficiency of the CARBOFLUOREX process for recovery and separating of U from FPs contained in FA, which allows completing of the FVM cycle with recovery of U and Pu from hardly processed FA.
Keywords
Fluorination ash; Uranium tetrafluoride; Uranyl fluoride; Oxidative leaching; Solvent extraction; Quaternary ammonium compounds; Methyltrioctylammonium carbonate;
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