Back-Extraction of Uranium(VI) from Organophosphoric Acid with Hydrazine Carbonate |
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| Authors: | M Watanabe R Tatsugae K Shirahashi Y Morita M Kubota |
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| Institution: | (1) Department of Materials Science, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, 319-1195, Japan;(2) Ishikawajima Harima Heavy Industry Co. Ltd., Isogo-ku, Yokohama, 235-8501, Japan;(3) Department of Safety Research Technical Support, Nuclear Safety Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, 319-1195, Japan;(4) Research Organization for Information Science and Technology, Tokai-mura, Ibaraki, 319-1195, Japan |
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| Abstract: | The back-extraction of uranium(VI) from di(2-ethylhexyl)phosphoric acid (HDEHP) and diisodecylphosphoric acid (DIDPA) was studied by using hydrazine carbonate as back-extractant. U(VI) was back-extracted from n-dodecane solutions of 0.5M HDEHP - 0.2M TBP and 0.5M DIDPA - 0.1M TBP by hydrazine carbonate. The distribution ratios were decreased with an increase of hydrazine carbonate concentration. The back-extraction equilibria were expressed by slope analysis in consideration of neutralization between the extractant (DIDPA, HDEHP) and hydrazine carbonate, which occurred quantitatively during the back-extraction. |
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