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

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

YANG Xiao-Nan ¹ ,
YAN Yong-De ^1,2, ,
ZHANG Mi-Lin ¹ ,
LI Xing ¹ ,
XUE Yun ² ,
HAN Wei ¹

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: 25 March 2015
Fund Project: 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)

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).
- Molten salt,
- Change of gibbs free energy,
- Activation coefficient,
- Extraction efficiency,
- Electrolytic extraction
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