Extraction of palladium from nitric acid solutions by octyl(phenyl)-N,N-diisobutylcarbamoyl- methylphosphine oxide |
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| Authors: | T. Fujii H. Yamana M. Watanabe H. Moriyama |
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| Affiliation: | (1) Research Reactor Institute, Kyoto University, Noda, Kumatori, Sennan, Osaka, 590-0494, Japan;(2) O-arai Engineering Center, Japan Nuclear Cycle Development Institute, 4002 Narita, O-arai, Ibaraki, 311-1393, Japan |
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| Abstract: | Extraction behaviors of Pd(II) in the TRUEX and PUREX solvent extractions were studied by using octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide. The effect of scrubbing in the TRUEX solvent extraction was demonstrated by adding oxalic acid. The distribution ratios of palladium (DPd's) in the diluted region of [HNO3] were found to depend strongly on the fraction of cationic species, Pd(NO3)+, existed in the aqueous phase. The gradual decrease of DPd with the increase of acidity beyond [H+]  1 mol·dm-3 was controlled by the formation of the anionic species Pd(NO3)3-. |
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