Interaction of Iodine with an Extractant of 30% TBP/70% n-Dodecane.

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概要

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• The interaction of iodine species with <SUP>60</SUP>Co-irradiated extractants of 30% TBP/70% n-dodecane was examined to infer the behavior of iodine downstream of the dissolution step in reprocessing. When a simulated spent-fuel solution (in which the main iodine species was colloidal iodine) was contacted with the extractant with irradiation dose of 2.8×10<SUP>2</SUP>C/kg or less at 25°C, 70 to 80% of iodine was transferred to the organic phase together with 100% of uranium. About 50% of the iodine was retained therein during back-extraction of uranium by water at 60°C and transferred to aqueous phase in the solvent cleaning by alkaline solution. Only 4 to 5% of iodine was finally fixed in the organic phase. When the extractant was irradiated to 10<SUP>3</SUP>C/kg or more, a "third phase" appeared in extraction step and the majority of iodine (about 65%) was sorbed in this phase. Over 90% of elemental iodine (I<SUB>2</SUB>) in a UO<SUB>2</SUB>(NO<SUB>3</SUB>)<SUB>2</SUB>-HNO<SUB>3</SUB> solution was extracted to the organic phase regardless of irradiation dose of the extractant and half of it remained therein after solvent cleaning. Iodate (IO<SUB>3</SUB><SUP>-</SUP>) in the same solution was extracted increasingly with increasing irradiation dose of the extractant.

• 一般社団法人 日本原子力学会の論文

著者

• Sakurai Tsutomu

  Physical Chemistry Laboratory Japan Atomic Energy Research Institute

• Takahashi Akira

  Physical Chemistry Laboratory Japan Atomic Energy Research Institute

• ISHIKAWA Niroh

  Physical Chemistry Laboratory, Japan Atomic Energy Research Institute

• KOMAKI Yoshihide

  Physical Chemistry Laboratory, Japan Atomic Energy Research Institute

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• Interaction of Iodine with an Extractant of 30% TBP/70% n-Dodecane.

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