期刊
ELECTROCHIMICA ACTA
卷 158, 期 -, 页码 277-286出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.01.128
关键词
Electroseparation; thorium; LiCl-KCl eutectic; ThO2 and La2O3; Al-Th alloys
资金
- Major Research Plan Breeding and Trans-mutation of Nuclear Fuel in Advanced Nuclear Fission Energy System of the Natural Science Foundation of China [91226201, 91426302, 11275219]
- Strategic Priority Research program of the Chinese Academy of Sciences [XDA0301040]
In 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.
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