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Distribution of U(VI) and Pu(IV) by ${it N,N}$-di(2-ethylhexyl)butanamide in continuous counter-current extraction with mixer-settler extractor

${it N,N}$-ジ(2-エチルヘキシル)ブタンアミドを用いたミキサセトラ抽出器での向流抽出法によるU(VI)とPu(IV)の分配

伴 康俊; 宝徳 忍; 森田 泰治

Ban, Yasutoshi; Hotoku, Shinobu; Morita, Yasuji

${it n}$-ドデカンで1.5mol/dm$$^{3}$$(M)に希釈した${it N,N}$-ジ-(2-エチルヘキシル)ブタンアミド(DEHBA)のU(VI)及びPu(IV)に対する抽出特性を一段のバッチ法にて調査し、U(VI)及びPu(IV)の分配比を与える式として${it D}$ $$_{rm U}$$ = 1.4[NO$$_{3}$$ $$^{-}$$]$$^{1.6}$$[DEHBA$$_{rm free}$$]$$^2$$及び${it D}$ $$_{rm Pu}$$ = 0.11[NO$$_{3}$$ $$^{-}$$]$$^{3.3}$$[DEHBA$$_{rm free}$$]$$^2$$をそれぞれ得た。ミキサセトラ抽出器を用いて1.5MのDEHBAを抽出剤とする連続向流試験を実施し、U-Pu抽出部において99.9%以上のU(VI)及びPu(IV)を抽出した。抽出されたPu(IV)は0.67M硝酸によって逆抽出され、フィード液中のPu(IV)の97%以上をPuフラクションに回収した。本研究の結果からDEHBAが、Pu(IV)の還元剤を用いることなく硝酸濃度を調節することによって、U(VI)とPu(IV)を相互分離する抽出剤として機能することが示された。

The extraction properties of 1.5 mol/dm$$^{3}$$ (M) ${it N,N}$-di-(2-ethyl-hexyl)butanamide (DEHBA) diluted with ${it n}$-dodecane toward U(VI) and Pu(IV) were studied using a single stage batch method, and the distribution ratios toward U(VI) and Pu(IV) were, respectively, obtained as follows: ${it D}$ $$_{rm U}$$ = 1.4[NO$$_{3}$$ $$^{-}$$]$$^{1.6}$$[DEHBA$$_{rm free}$$]$$^2$$ and ${it D}$ $$_{rm Pu}$$ = 0.11[NO$$_{3}$$ $$^{-}$$]$$^{3.3}$$[DEHBA$$_{rm free}$$]$$^2$$. A continuous counter-current experiment with 1.5 M DEHBA as an extractant was performed using mixer-settler extractors. The ratios of U(VI) and Pu(IV) extracted by 1.5 M DEHBA in the U-Pu extraction step were more than 99.9%. The extracted Pu(IV) was back-extracted using 0.67 M nitric acid, and more than 97% of Pu(IV) in the feed was recovered in the Pu fraction. The present results indicated that DEHBA works as an extractant for mutual separation of U(VI) and Pu(IV) by adjusting the nitric acid concentration without using Pu(IV) reductants.

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パーセンタイル:63.39

分野:Chemistry, Multidisciplinary

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