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Direct extraction of uranium from yellow cake and ore matrices using supercritical carbon dioxide
- Source :
- Radiochimica Acta. 108:769-777
- Publication Year :
- 2020
- Publisher :
- Walter de Gruyter GmbH, 2020.
-
Abstract
- The study demonstrates the accomplishment of single step, direct supercritical fluid carbon dioxide (SC CO2) dissolution and extraction of uranium from crude matrices viz. yellow cakes (>90%) and rock phosphate ores (70%) employing adducts of trialkyl phosphates and nitric acid, thus avoiding free acid usage and eliminating number of process steps. Rock phosphate ore was made amenable for supercritical fluid extraction (SFE) system by unique strategy of pyrohydrolytic removal of fluorine. Pressure and temperature conditions, which were found to influence uranium extraction efficiency, were optimized at 150 atm. and 323 K. Two milliliter of adduct amount was found to be adequate. Adducts of branched alkyl phosphate, tri-isoamyl phosphate and tri-ethyl hexyl phosphate (TEHP), yield better purity in comparision to straight chain tri-butyl phosphate (TBP).
- Subjects :
- Supercritical carbon dioxide
Extraction (chemistry)
chemistry.chemical_element
02 engineering and technology
Uranium
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
chemistry
Chemical engineering
Physical and Theoretical Chemistry
0210 nano-technology
Roasting
Subjects
Details
- ISSN :
- 21933405 and 00338230
- Volume :
- 108
- Database :
- OpenAIRE
- Journal :
- Radiochimica Acta
- Accession number :
- edsair.doi...........e42fb42ba641135aeadf379aa4ec597e