Insights in uranium extraction from spent nuclear fuels using dicyclohexano-18-crown-6 – Fate of rhenium as technetium homolog
| Autor: | Gérard Cote, Kenneth R. Czerwinsky, Micheline Draye, Alain Favre-Réguillon |
|---|---|
| Přispěvatelé: | Laboratoire de Génie des Procédés Catalytiques (LGPC), École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire LCME / Equipe Chimie Verte (LCME_CV), Laboratoire de Chimie Moléculaire et Environnement (LCME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Electrochimie et de Chimie Analytique (LECA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
Perrhenate
Extraction (chemistry) chemistry.chemical_element Filtration and Separation 02 engineering and technology Rhenium Uranium 021001 nanoscience & nanotechnology Technetium Uranyl 7. Clean energy Analytical Chemistry chemistry.chemical_compound 020401 chemical engineering chemistry [CHIM.ANAL]Chemical Sciences/Analytical chemistry Nitric acid [SDE]Environmental Sciences 0204 chemical engineering 0210 nano-technology ComputingMilieux_MISCELLANEOUS Stoichiometry Nuclear chemistry |
| Zdroj: | Separation and Purification Technology Separation and Purification Technology, Elsevier, 2019, 209, pp.338-342 |
| ISSN: | 1383-5866 |
| Popis: | The single extraction of rhenium(VII) and uranium(VI) from nitric acid solution by dicyclohexano-18-crown-6 (DCH) solutions was investigated. The extraction of Re(VII), in the form of perrhenate (ReO4−) anion, was optimum for a nitric acid concentration of 3 M and was explained by the ion-pair extraction of perrhenate anions by the hydroxonium DCH complex. The stoichiometry of the Re(VII) complex was obtained from the distribution data by slope analysis and the extracted specie was identified as {ReO4−(DCH-H3O)+}. The uranyl extraction by DCH solutions was evaluated under the same conditions and the extracted specie was identified as {(NO3−)2(DCH-UO22+)} for a nitric acid concentration above 5 M. The extraction of rhenium(VII) from nitric acid solution by DCH solutions in the presence of large excess of uranium(VI) was then investigated. For a nitric acid concentration of 3 mol/L, the extraction efficiency of perrhenate was found to be almost independent of uranium concentration. Based on the chemical similarities between Re(VII) and Tc(VII), this suggests that DCH could be considered for the separation of technetium (VII)/uranium(VI) from nitric acid solution. |
| Databáze: | OpenAIRE |
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