氯化物熔盐体系中Gd的电化学行为及提取效率的评估

引用本文: 杨晓南, 颜永得, 张密林, 李星, 薛云, 韩伟. 氯化物熔盐体系中Gd的电化学行为及提取效率的评估[J]. 物理化学学报, 2015, 31(5): 920-926. doi: 10.3866/PKU.WHXB201503251 shu

Citation: YANG Xiao-Nan, YAN Yong-De, ZHANG Mi-Lin, LI Xing, XUE Yun, HAN Wei. Electrochemical Behavior and Extraction Efficiency Evaluation of Gd in Chloride Molten Salt System[J]. Acta Physico-Chimica Sinica, 2015, 31(5): 920-926. doi: 10.3866/PKU.WHXB201503251 shu

氯化物熔盐体系中Gd的电化学行为及提取效率的评估

杨晓南 ^1, ,
颜永得 ^1,2, ,
张密林 ^1, ,
李星 ^1, ,
薛云 ^2, ,
韩伟 ^1,

基金项目:
国家自然科学基金(21103033, 21101040, 91226201, 51104050) (21103033, 21101040, 91226201, 51104050)

中国和黑龙江博士后特别资助科学基金(2013T60344, LBH-TZ0411) (2013T60344, LBH-TZ0411)

中央高校基本科研业务经费(HEUCF20151007) (HEUCF20151007)

黑龙江省普通高等学校和哈尔滨工程大学青年学术骨干支持计划项目(1253G016, HEUCFQ1415)资助 (1253G016, HEUCFQ1415)

摘要:

研究了773 K时GdCl₃在LiCl-KCl熔盐体系中在Mo和Al 电极上的电化学行为和热力学特性. 利用开路计时电位曲线得到了Gd(III)/Gd(0)体系在723-873 K温度范围的平衡电极电位和表观电极电位. 结果表明: 平衡电极电位和表观电极电位随着温度的升高而变正. 通过吉布斯自由能变进一步计算得到了GdCl₃在LiCl-KCl熔盐体系中不同温度下的活度系数. 结合稳态极化曲线, 求得去极化值, 并通过热力学计算, 求得773 K时Gd的理论提取效率. 在773 K时, 在LiCl-KCl-GdCl₃体系中, 以Al 为工作电极在-1.5 V左右通过恒电位电解提取Gd, 电解20 h后实际电解提取效率为94.22%. 对电解沉积物进行X射线衍射(XRD)分析, 检测到了Al₃Gd合金相.

关键词:

English

Electrochemical Behavior and Extraction Efficiency Evaluation of Gd in Chloride Molten Salt System

1.
1 Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China;
2 Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, P. R. China
Received Date: 18 December 2014
Available Online: 08 May 2015
Fund Project:
国家自然科学基金(21103033, 21101040, 91226201, 51104050)

中国和黑龙江博士后特别资助科学基金(2013T60344, LBH-TZ0411)

中央高校基本科研业务经费(HEUCF20151007)

黑龙江省普通高等学校和哈尔滨工程大学青年学术骨干支持计划项目(1253G016, HEUCFQ1415)资助

Abstract:

The electrochemical behavior and thermodynamic properties of GdCl₃ in LiCl-KCl molten salt system on both Mo and Al electrodes at 773 K were investigated. An open circuit chronopotentiogram was used to determine the equilibrium potentials and standard apparent potentials of the Gd(III)/Gd(0) system in the temperature range 723-873 K. The results showed that the equilibrium potentials and apparent standard potentials became positive with increasing temperature. The activity coefficients of GdCl₃ were calculated at different temperatures. The depolarization values were calculated by steady state polarization tests, and the theoretical extraction efficiency was obtained at 773 K. Potentiostatic electrolysis was performed to extract gadolinium from LiCl-KCl-GdCl₃ molten salt on Al electrodes at -1.5 V. The extraction efficiency was about 94.22% after 20 h. The Al₃Gd phase was identified in the deposit by X-ray diffraction (XRD).

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

氯化物熔盐体系中Gd的电化学行为及提取效率的评估

English

Electrochemical Behavior and Extraction Efficiency Evaluation of Gd in Chloride Molten Salt System

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氯化物熔盐体系中Gd的电化学行为及提取效率的评估

English

Electrochemical Behavior and Extraction Efficiency Evaluation of Gd in Chloride Molten Salt System

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