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An extractant is required in the recovery process to drive the uranium to a stage that enables it to be extracted using the extraction solvent. This paper proposes the composition of a composite extractant, N,N,N′,N′-tetrabutyl-3-oxapentane-diamide–HNO3 (TBODA–HNO3) as an extractant, to successfully achieve the objective using supercritical carbon dioxide (sc-CO2). The composite TBODA–HNO3 extractant...