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Studies on electrochemical behavior of uranium species in choline chloride-urea eutectic for developing electrolytically treating method of uranium-bearing wastes

ウラン廃棄物処理を目的とした、尿素コリンクロリド共晶混合物中のウラン種の電気化学的挙動に関する研究

大橋 裕介; 浅沼 徳子*; 原田 雅幸*; 田中 祥雄; 池田 泰久*

Ohashi, Yusuke; Asanuma, Noriko*; Harada, Masayuki*; Tanaka, Yoshio; Ikeda, Yasuhisa*

ウランを含有する廃棄物からのウラン回収法として、常温で液体である尿素-コリンクロリド共晶物を用いた電解析出法を提案した。焼結アルミナ及び使用済みNaF吸着材中のウランは92%以上が選択的に共晶物に溶解した。共晶物のサイクリックボルタモグラム測定の結果、-0.7V付近にU(VI)の還元ピークが見られ、-1.5Vでの定電位電解の結果、カソード炭素電極にウラン析出物が生成された。この結果から、尿素-コリンクロリド共晶物はウラン廃棄物からのウラン回収に効果的な媒体であることを確認した。

As one of methods for recovering uranium from the uranium-bearing wastes, we have proposed the electrolytic deposition method using choline chloride-urea (CCU) which is known as an ambient temperature molten salt. More than 92% of uranium components in inactivated alumina and spent sodium fluoride adsorbent was dissolved into CCU solution. Cyclic voltammograms (CVs) of the solutions prepared by dissolving uranium-bearing wastes in CCU were measured in the potential range of -2.0 to 1.1 V (vs. Ag/AgCl). The one reduction peak was observed around -0.7 V for all solutions. Based on the results of CVs, bulk electrolyses of the solutions dissolving uranium-bearing wastes were also carried out at -1.5V at 80 $$^{circ}$$C. The deposits were formed on a carbon electrode as cathode. Consequently, we confirmed that CCU is effective media for recovering uranium selectively from uranium-bearing waste.

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パーセンタイル:76.09

分野:Chemistry, Analytical

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