Stoichiometric Relation for Extraction of Uranium from UO_2 Powder using TBP Complex with HNO_3 and H_2O in Supercritical CO_2

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The stoichiometry of UO2 dissolution with a tri-n-butylphosphate (TBP) complex with HNO3 and H2O was experimentally determined in supercritical carbon dioxide (SF-CO2) at 25 MPa, 323 K to estimate the required amount of the complex for a process design calculation. The molecular ratio of TBP:HNO3:H2O was determined as 1.0:1.8:0.6 when prepared as an organic phase after vigorous mixing of concentrated HNO3 and TBP. The HNO3 consumption was approximately 4 times the amount of extracted uranium. In designing a supercritical fluid extraction process, the following equation can be used to describe the overall dissolution of UO2 using the TBP complex with HNO3 and H2O in SF-CO2: UO2+4HNO3+2TBP→UO2(NO3)2·2TBP+2NO2+2H2O.
社団法人日本原子力学会の論文
2005-03-25