Abstract
The solubility of the uranyl nitrate complex with tributyl phosphate (TBP) in liquid and supercritical carbon dioxide (SC-CO2) has been measured as a function of temperature and pressure. This complex is formed upon the dissolution of uranium dioxide in the two-phase system consisting of aqueous iron(III) nitrate and TBP-saturated liquid or supercritical CO2. The kinetics of the dissolution of ceramic UO2 in such a two-phase solvent is studied. It has been shown that uranium can be extracted in the presence of TBP-containing supercritical CO2 via the dissolution of spent oxide nuclear fuel in subacidic iron(III) nitrate solutions with the simultaneous extraction of the uranium complex into the TBP-SC-CO2 phase.
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