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Feasibility studies on electrochemical recovery of uranium from solid wastes contaminated with uranium using 1-butyl-3-methylimidazorium chloride as an electrolyte

1-butyl-3-methylimidazorium chlorideを電解質に用いた、固体ウラン汚染物からのウランの電気化学的回収に関する実現可能性の検討

大橋 裕介; 原田 雅幸*; 浅沼 徳子*; 池田 泰久*

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

固体廃棄物からのウランの電気化学的析出の実現性を検討するため、NaF、金属廃棄物中のウランをBMICl(1-butyl-3-methyl- imidazolium chloride)に溶解し、溶液中のウランの電気化学的挙動を調べた。U(VI)イオンはU(V)に-0.8から-1.3Vの範囲で非可逆的に還元されると推察され、この結果に基づき、-1.5Vにおいて定電位電解を実施したところ、F, Cl, N, Oを含むU(VI)とU(IV)の混合物が得られた。この結果から、固体廃棄物中のウランをBMIClによって電解回収できる可能性が示された。

In order to examine feasibility of the electrochemical deposition method for recovering uranium from the solid wastes contaminated with uranium using ionic liquid as electrolyte, we have studied the electrochemical behavior of each solution prepared by soaking the spent NaF adsorbents and the steel waste contaminated with uranium in BMICl (1-butyl-3-methyl- imidazolium chloride). The uranyl(VI) species in BMICl solutions were found to be reduced to U(V) irreversibly around -0.8 to -1.3 V vs. Ag/AgCl. Based on the electrochemical data, we have performed potential controlled electrolysis of each solution at -1.5 V vs. Ag/AgCl. Black deposit was obtained, and their composition analyses suggest that the deposit is the mixtures of U(IV) and U(VI) compounds containing O, F, Cl, and N elements. From the present study, it is expected that the solid wastes contaminated with uranium can be decontaminated by treating them in BMICl and the dissolved uranium species are recovered electrolytically.

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パーセンタイル:27.6

分野:Materials Science, Multidisciplinary

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