Optimal Monazite Concentration Processes for the Extraction of Uranium and Thorium Fuel Material

Olga Fedorova, Elizaveta Vershinina, Svetlana Krasitskaya, Ivan Tananaev, Boris Myasoedov and Marco Vocciante
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Olga Fedorova: Ozyorsk Technological Institute, National Research Nuclear University (MEPhI), 456780 Ozyorsk, Russia
Elizaveta Vershinina: School of Natural Sciences, Far Eastern Federal University, 690090 Vladivostok, Russia
Svetlana Krasitskaya: School of Natural Sciences, Far Eastern Federal University, 690090 Vladivostok, Russia
Ivan Tananaev: Ozyorsk Technological Institute, National Research Nuclear University (MEPhI), 456780 Ozyorsk, Russia
Boris Myasoedov: Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991 Moscow, Russia
Marco Vocciante: Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, Italy

Energies, 2020, vol. 13, issue 18, 1-10

Abstract: The optimal conditions for the nitric acid dissolution of precipitates of hydroxides and hydrated oxides of rare-earth elements, uranium, and thorium obtained after autoclave alkaline opening of samples of monazite concentrate have been determined. The distribution of radioactive impurities between the solid phase and the solution in the processes of alkaline opening, dephosphorization, and acid dissolution of the pulp was studied. Two options are proposed for the extraction of uranium and thorium in the presence of rare earth elements, followed by separation of the components using tributyl phosphate of various contents in the carbon diluent.

Keywords: monazite; autoclave leaching; flow chart; rare earth elements; thorium; uranium; radium; separation; extraction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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