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RESEARCH ON NEW EXTRACTANTS FOR REPROCESSING OF SPENT Th-U FUEL III.EXTRACTION OF URANIUM(VI) AND THORIUM(IV) FROM NITRIC ACTD SOLUTION BY N-OCTYLCAPROLACTAM

Zhigang Cao, Ian J

Abstract

Extraction of uranium (Ⅵ), thorium (Ⅳ) and nitric acid has been studied with N-octylcapro-lactam. Distribution coefficients of U(Ⅵ) ,Th(Ⅳ) and HNO3 as a function of aqueous HNO3 concen tration, extractant concentration and temperature have been studied. The compositions of extracted species, thermodynamic parameters of extraction reaction have been evaluated. The third phase formation in the extraction of U(Ⅵ) has been studied. Back extraction behaviours of U(Ⅵ) and Th(Ⅳ) from organic phase have also been tested. The results obtained have compared with those using TBP at the same experimental conditions.

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Key concepts: Chemistry, Thorium, Nitric acid, Uranium, Extraction (chemistry), Nuclear chemistry, Aqueous two-phase system, Actinide