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Uranium and plutonium extraction from nitric acid by ${it N,N}$-di(2-ethylhexyl)-2,2-dimetnylpropanamide (DEHDMPA) and ${it N,N}$-di(2-ethylhexyl)butanamide (DEHBA) using mixer-settler extractors

${it N,N}$-ジ(2-エチルヘキシル)-2,2-ジメチルプロパンアミド(DEHDMPA)及び${it N,N}$-ジ(2-エチルヘキシル)ブタンアミド(DEHBA)を用いた、ミキサセトラ型抽出機による硝酸溶液からのウラン及びプルトニウムの抽出

伴 康俊; 宝徳 忍; 津幡 靖宏 ; 森田 泰治

Ban, Yasutoshi; Hotoku, Shinobu; Tsubata, Yasuhiro; Morita, Yasuji

${it N,N}$-ジ(2-エチルヘキシル)-2,2-ジメチルプロパンアミド(DEHDMPA)の硝酸, U(VI)、及びPu(IV)に対する抽出特性をバッチ法で調べ、それぞれの化学種に対する分配比計算式を導出した。DEHDMPA及び${it N,N}$-ジ(2-エチルヘキシル)ブタンアミド(DEHBA)を抽出剤としたミキサセトラによる連続抽出試験を実施した。DEHDMPAはフィード液中のUを選択的に抽出し、99.93%のUをUフラクションに回収した。また、DEHBAはPuのほぼ全量を抽出し、99.94%のPuをU-Puフラクションに回収した。ミキサセトラ各段におけるU及びPuの濃度のシミュレーション計算を行い、本計算手法がUフラクションにおけるU濃度、及びU-PuフラクションにおけるPu濃度の計算に有効であることを示した。

Extraction properties of ${it N,N}$-di(2-ethylhexyl)-2,2-dimethylpropanamide (DEHDMPA) for nitric acid, U(VI), and Pu(IV) were studied, and the distribution ratio equations were derived for each chemical species. A continuous counter-current experiment was performed using mixer-settler extractors with two types of monoamides, DEHDMPA and ${it N,N}$-di(2-ethylhexyl)butanamide (DEHBA), as extractants. DEHDMPA exclusively extracted U from the feed, and the ratio of U recovered in the U fraction stream was 99.93%. Almost all Pu were extracted by DEHBA, and the recovery of Pu in the U-Pu fraction stream was 99.94%. Concentrations of U and Pu in mixer-settlers were calculated using a simulation code, which confirmed that the calculation was effective for estimating the U concentration in the U fraction stream, and the U and Pu concentrations in the U-Pu fraction stream.

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パーセンタイル:69.96

分野:Chemistry, Multidisciplinary

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