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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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https://hal.archives-ouvertes.fr/hal-01583524
Contributor : Elena Rosu <>
Submitted on : Thursday, September 7, 2017 - 2:44:57 PM
Last modification on : Thursday, April 2, 2020 - 3:26:07 PM

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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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