Supercritical CO 2 extraction of uranium from natural ore using organophosphorus extractants

Abstract : The feasibility of extracting uranium from natural ores has been studied, using supercritical CO2 and either commercial extractants (PC88A, Cyanex 301®) or an amidophosphonate molecule (named DEHCNPB). The impact of the process parameters has been evaluated. The uranium extraction yield was optimal at the lowest temperature (40 °C) and highest pressure (25 MPa) tested here. For a given CO2 flow rate, a compromise should be established between the amounts of extractant, acid and oxidant used. Uranium was successfully extracted directly from natural ore using DEHCNPB with a good selectivity over metal impurities such as iron, titanium and vanadium and yields up to 97%. Moreover, using Fe2(SO4)3 as an oxidant allows to minimize the water usage of the process. The mechanism of extraction using supercritical CO2 has been elucidated thanks to electrospray ionization mass spectrometry.
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Chemical Engineering Journal, Elsevier, 2017, 316, pp.196 - 203. 〈10.1016/j.cej.2017.01.101〉
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https://hal.archives-ouvertes.fr/hal-01583524
Contributeur : Elena Rosu <>
Soumis le : jeudi 7 septembre 2017 - 14:44:57
Dernière modification le : lundi 4 mars 2019 - 14:04:17

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Antoine Leybros, Laurence Hung, Audrey Hertz, Didier Hartmann, Agnès Grandjean, et al.. Supercritical CO 2 extraction of uranium from natural ore using organophosphorus extractants. Chemical Engineering Journal, Elsevier, 2017, 316, pp.196 - 203. 〈10.1016/j.cej.2017.01.101〉. 〈hal-01583524〉

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