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ジグリコールアミド溶媒抽出による全TRU分離技術開発; ミキサセトラを用いた多段分離試験

Development of total recovery of TRU by diglycolamide-type compounds; Multi-stage separation test using mixer-settler

朝倉 俊英; 今泉 浩文; 佐々木 祐二  ; 北辻 章浩  ; 森田 泰治  ; 木村 貴海 

Asakura, Toshihide; Imaizumi, Hirobumi; Sasaki, Yuji; Kitatsuji, Yoshihiro; Morita, Yasuji; Kimura, Takaumi

ジグリコールアミド溶媒抽出による全TRU分離技術を開発しており、この技術について、使用済FBR燃料再処理等におけるMA回収プロセスへの適用可能性を検討している。Am, Cm, Ln等3価カチオン全体の代表であるNdとSr, Zr, Pdが共存し、H$$_{2}$$O$$_{2}$$及びEDTAを含む1M(mol dm$$^{-3}$$)硝酸溶液をフィード液とし、0.1Mのtetradodecyl diglycolamide(TDdDGA)/ドデカンを抽出溶媒としてミキサセトラによる多段分離試験を行った。その結果、Ndについては高い抽出率が得られ、また、Srについては高い効率でNdと分離することができた。Zr, Pdは、ほぼ全量が抽出残液に移行したものの、Zrの3%、Pdの0.4%がNd製品へ移行した。

Total TRU separation technology using diglycolamide as an extraction solvent has been developed to apply it to the MA separation process of the spent FBR fuel reprocessing, etc. Separation tests were performed using Mixer-settlers. 1 M (mol dm$$^{-3}$$) nitric acid solution containing Nd, Sr, Zr, Pd, H$$_{2}$$O$$_{2}$$ and EDTA was used as the feed, and 0.1 M tetradodecyl diglycolamide / docecane was used as the extraction solvent. Only Nd was used to represent the trivalent cations such as Am, Cm and rare earthes. As the results, Nd was extracted from the feed and Sr was separated from Nd, highly effectively. Almost all of Zr and Pd were not extracted and transferred to raffinate, 3 % of Zr and 0.4 % of Pd, however, were transferred to the Nd product.

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