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This paper is to present the technology developed in WTL, PNC for the partitioning of actinides in High Level Liquid Waste (HLLW) from nuclear fuel reprocessing plant. Partitioning experiments were primarily made with the batch extraction method, and the counter current continuous extraction method was also examined by using a laboratory scale mixer-settler. Extractants used were Dibutylbutyl Phosphonate (DBBP), Tri-n-butyl Phosphate (TBP), Di (2-ethylhexyl) Phosphoric Acid (D2EHPA) and Di-Mono (2-ethylhexyl) Phosporic Acid mixture (D/M2EHPA, mol ratio D/M=1/1). Other studies were made of the reduction of Pu (IV) or Fe (III) by hydrazine in the nitric acid solution with the active charcoal catalyst. Further studies were also made of the effect of the lactic acid addition on the extraction of Pu (IV) and U (VI) by TBP. The results from the batch extraction of Am (III), Eu(III), and Ce(III) in the DBBP, TBP, D2EHPA or D/M2EHPA-HNO $_{3}$ -M $^{n+}$ (NO $_{3}$ ) $_{n}$ systems showed the linear relationship between log (E/ORG $^{n}$ ) vs. log (NO $_{3}$ ) aq and log E vs. log (H $^{+}$ )aq. The apparent equilibrium constants (Km) of 1.10 (Am-DBBP), 1.26 (Eu-DBBP), 1.22(Ce-DBBP), 0.0352(Am-TBP), 0.0549(Eu-TBP), 0.0312(Ce-TBP), 0.845(Am-D2EHPA), 22(Am-D/M2EHPA), 22.7(Eu-D/M2EHPA) and 18.7(Ce-D/M2EHPA) were obtained from there relationships. For the reduction of Pu (IV) and Fe (III) in the HNO $_{3}$ -hydrazine-active chacoal catalyst system, a good linearity between the reaction ratio and the reduction time was observed, and the reaction was apparently of the first order. The reduction rates of Pu (IV) and Fe (III) in this system were significantly increased by 300 times that observed in the system without the active chacoal catalyst. The addition of lactic acid to the system of HNO $_{3}$ -U-Pu-TBP lowered the extractability of Pu (IV) to TBP, and the distribution coefficient of Pu (IV), for example, was in the vicinity of that for Pu (III) in the 0.5N HNO $_{3}$ -0.3M lactic acid soluti

JAEA Reports

FBR fuel reprocessing pulsed column equipment, II test; A change for the worse of extraction column dispersion state and its cause

Hayashi, Shotaro; Kishimoto, Yoichiro; Kawata, Tomio*; Tanaka, Mutsuo; Nemoto, Shinichi; Kitamura, Koichiro

PNC TN8410 87-082, 92 Pages, 1987/04

PNC-TN8410-87-082.pdf:15.22MB

no abstracts in English

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A Study on the Interfacial Croud Formation in the Purex Process

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FBR Fuels reprocessing experiments at CPF

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FBR reprocessing experiments at CPF, 15

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FBR fuel reprocessing pulsed colum test; Evaluation of operation parameter for strip in pulsed column

FBR fuel reprocessing pulsed colum equipment (II) test; Operational characteristies qguinet various desturbances in pulsed clunm system, I

Studies on the partitioning of high level liquid waste; Extraction of transuranium and fission products with DBBP, TBP, D2EHPA and D/M2EHPA (mixed solvent)

FBR fuel reprocessing pulsed column equipment, II test; A change for the worse of extraction column dispersion state and its cause