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Stoichiometric Relation for Extraction of Uranium from UO<sub>2</sub>Powder using TBP Complex with HNO<sub>3</sub>and H<sub>2</sub>O in Supercritical CO<sub>2</sub>
22
Citations
12
References
2005
Year
Solvent ExtractionEngineeringSupercritical Fluid ChromatographyChemistryMineral ProcessingInorganic MaterialChemical EngineeringTbp ComplexAnalytical ChemistryNuclear MaterialsNuclear ReactorsOverall DissolutionMaterials ScienceInorganic ChemistrySupercritical FlowHydrogenNuclear EngineeringRadioactive Waste DisposalSupercritical Co2Uo2 DissolutionExtractive MetallurgyEnvironmental EngineeringStoichiometric RelationChemical Kinetics
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:
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