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Electroseparation of thorium from ThO2 and La2O3 by forming Th-Al alloys in LiCl-KCl eutectic
Liu YL(刘雅兰); Yuan LY(袁立永); Liu K(刘奎); Feng YX(冯一潇); Li ZJ(李子杰); Chai ZF(柴之芳); Shi WQ(石伟群); Liu, YL; Ye, GA; Yuan, LY; Liu, K; Feng, YX; Li, ZJ; Chai, ZF; Shi, WQ
Corresponding Author石伟群
AbstractIn this work, AlCl3 was employed to chloridize ThO2 and La2O3 with the formation of ThCl4 and LaCl3 in the LiCl-KCl eutectic at 773 K. The chlorination can be accomplished in less than one hour, displaying a fast chlorination kinetic. Cyclic voltammetry (CV) technique was used to evaluate the feasibility of the separation of Th4+ from La3+ through forming Th-Al alloys. The results showed that the disparity between the deposition potentials of Th-Al and La-Al alloys was approximately 0.2 V at 773 K, which is theoretically sufficient for the separation of Th4+ from La3+. Subsequently, the separation of Th4+ from La3+ was carried out on Al cathodes by galvanostatic electrolysis and potentiostatic electrolysis at the temperature of 773 K. During the separation process, the concentrations of Th4+ and La3+ ions were monitored by both SquareWave Voltammetry (SWV) on a W electrode and ICP-AES analysis of the melt. The deposited products were characterized by the scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and inductively coupled plasma atomic emission spectrometer (ICP-AES). Finally, by potentiostatic electrolysis at -1.20 V for 48 h in an Al3+ ion sufficient system, the recovery rate of Th was determined to be 97.1%. In addition, the separation factor (SF) of Th to La of 1367.4 was achieved. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordElectroseparation thorium LiCl-KCl eutectic ThO2 and La2O3 Al-Th alloys
Subject AreaElectrochemistry
Indexed BySCI ; EI ; CA
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000350446000036
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Document Type期刊论文
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GB/T 7714
Liu YL,Yuan LY,Liu K,et al. Electroseparation of thorium from ThO2 and La2O3 by forming Th-Al alloys in LiCl-KCl eutectic[J]. ELECTROCHIMICA ACTA,2015,158:277-286.
APA 刘雅兰.,袁立永.,刘奎.,冯一潇.,李子杰.,...&Shi, WQ.(2015).Electroseparation of thorium from ThO2 and La2O3 by forming Th-Al alloys in LiCl-KCl eutectic.ELECTROCHIMICA ACTA,158,277-286.
MLA 刘雅兰,et al."Electroseparation of thorium from ThO2 and La2O3 by forming Th-Al alloys in LiCl-KCl eutectic".ELECTROCHIMICA ACTA 158(2015):277-286.
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