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Application of ${it N,N}$-di(2-ethylhexyl)butanamide for mutual separation of U(VI) and Pu(IV) by continuous counter-current extraction with mixer-settler extractors

U(VI)及びPu(IV)の相互分離を目的としたミキサセトラ抽出器による連続向流抽出への${it N,N}$-ジ(2-エチルヘキシル)ブタンアミドの適用

伴 康俊; 宝徳 忍; 森田 泰治

Ban, Yasutoshi; Hotoku, Shinobu; Morita, Yasuji

${it N,N}$-ジ(2-エチルヘキシル)ブタンアミド(DEHBA)を抽出剤に用いて、U-Pu抽出部,スクラブ部,U回収部,Pu逆抽出部、及びU逆抽出部から構成されたミキサセトラ型抽出器による連続向流試験を実施した。連続向流試験のフィード液はU(VI), Pu(IV)、及び模擬核分裂生成物を含む3mol/dm$$^{3}$$(M)硝酸である。U-Pu抽出部において、フィード液に含まれている99.9%以上のU(VI)及びPu(IV)が1.9MのDEHBAによって抽出された。DEHBAに抽出されたPu(IV)は、Pu逆抽出部において0.3M硝酸によって逆抽出され、約82%のPuがPuフラクション側に分配された。1.9MのDEHBAがU回収部においてU(VI)を効果的に回収し、U(VI)のPuフラクション側への分配が1%未満であることを確認した。DEHBAに抽出されたU(VI)はU逆抽出部で逆抽出され、98%以上のU(VI)がUフラクション側に分配された。

Continuous counter-current extraction using ${it N,N}$-di(2-ethylhexyl)- butanamide (DEHBA) as an extractant was performed with mixer-settler type extractors consisting of U-Pu extraction, scrub, U recovery, Pu back-extraction, and U back-extraction steps. The feed solution used in the continuous counter-current extraction was 3 mol/dm$$^{3}$$ (M) nitric acid containing U(VI), Pu(IV), and simulated fission products. More than 99.9% of U(VI) and Pu(IV) in the feed was extracted by 1.9 M DEHBA at the U-Pu extraction step. The extracted Pu(IV) was back-extracted via contact with 0.3 M nitric acid in the Pu back-extraction step, and the ratio of Pu(IV) distributed to the Pu fraction stream was $$sim$$ 82%. It was confirmed that 1.9 M DEHBA effectively recovered U(VI) in the U recovery step, and the ratio of U(VI) in the Pu fraction stream was less than 1%. The extracted U(VI) was back-extracted in the U back-extraction step, and more than 98% of U(VI) was recovered in the U fraction stream.

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パーセンタイル:32.85

分野:Nuclear Science & Technology

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