検索対象:     
報告書番号:
※ 半角英数字
 年 ~  年

Electrochemical transient techniques for determination of uranium and rare-earth metal separation coefficients in molten salts

溶融塩中のウランと希土類金属の分離係数の電気化学的測定

Kuznetsov, S. A.*; 林 博和; 湊 和生; Gaune-Escard, M.*

Kuznetsov, S. A.*; Hayashi, Hirokazu; Minato, Kazuo; Gaune-Escard, M.*

使用済燃料の乾式再処理プロセスの検討のためには溶融塩中のアクチノイドと希土類元素の分離係数が必要である。その一例としてウランとランタンの分離係数の導出法を示した。またUCl$$_{3}$$とLaCl$$_{3}$$を含んだLiCl-KCl共晶溶融塩試料の電気化学測定を行い、U(III)/U及びLa(III)/Laの酸化還元電位,U$$^{3+}$$イオンの拡散係数,U(III)/U電極反応の電子授受速度を測定した。これらのデータを用いてウランとランタンの分離係数を求めた。

Electrochemical experiments were carried out at 723-823K in order to estimate separation coefficients in LiCl-KCl eutectic melt containing uranium and lanthanum trichlorides. The diffusion coefficients of U(III) were determined by electrochemical methods. The standard rate constants of charge transfer for electroreduction of uranium U(III) +3e$$^-$$=U were calculated by the impedance spectroscopy method. It was shown that for the calculation of uranium and lanthanum separation coefficients it is necessary to determine the voltammetric peak potentials of U(III) and La(III), their concentration in the melt and the kinetic parameters relating to U(III) discharge such as transfer and diffusion coefficients, and standard rate constants of charge transfer.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.