在AlCl3的辅助下从LiCl-KCl-AlCl3-Nd2O3熔盐中电解提取Nd*

doi:10.11900/0412.1961.2015.00576

金属学报

2016, Vol. 52

Issue (7): 883-889 DOI: 10.11900/0412.1961.2015.00576

论文

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在AlCl₃的辅助下从LiCl-KCl-AlCl₃-Nd₂O₃熔盐中电解提取Nd^*

薛云^1,²,杨雪¹,颜永得¹(

),张密林¹,纪德彬¹,李恩雨¹,韩伟¹

1 哈尔滨工业大学金属精密热加工国家级重点实验室, 哈尔滨 150001。
2 沈阳黎明航空发动机(集团)有限责任公司, 沈阳 110043。

ELECTROLYSIS EXTRACTION OF NEODYMIUM FROM LiCl-KCl-AlCl₃-Nd₂O₃ MELTS WITHTHE ASSISTANCE OF AlCl₃

Yun XUE^1,²,Xue YANG¹,Yongde YAN¹(

),Milin ZHANG¹,Debin JI¹,Enyu LI¹,Wei HAN¹

1 Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
2 Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China.

引用本文:

薛云,杨雪,颜永得,张密林,纪德彬,李恩雨,韩伟. 在AlCl₃的辅助下从LiCl-KCl-AlCl₃-Nd₂O₃熔盐中电解提取Nd^*[J]. 金属学报, 2016, 52(7): 883-889.
Yun XUE, Xue YANG, Yongde YAN, Milin ZHANG, Debin JI, Enyu LI, Wei HAN. ELECTROLYSIS EXTRACTION OF NEODYMIUM FROM LiCl-KCl-AlCl₃-Nd₂O₃ MELTS WITHTHE ASSISTANCE OF AlCl₃[J]. Acta Metall Sin, 2016, 52(7): 883-889.

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摘要:

研究了753 K时Nd在W和Al电极上LiCl-KCl-AlCl₃-Nd₂O₃体系中的电化学行为, 同时研究了AlCl₃对Nd₂O₃的氯化作用, 并直接以Nd₂O₃为原料, 在W和Al电极上电解提取Nd, 获得Al-Nd合金. 在W电极上, LiCl-KCl-Nd₂O₃体系中的循环伏安曲线中并未观察到Nd还原的信号. 加入AlCl₃后, 观察到Nd在预先沉积Al基体上欠电位沉积形成3种Al-Nd金属间化合物的电化学信号. 在Al电极上LiCl-KCl-AlCl₃-Nd₂O₃体系中观察到2种Al-Nd金属间化合物的形成信号. 测量结果表明, AlCl₃能有效地氯化Nd₂O₃. 在-2 A下, W电极上恒电流电解提取Nd, 获得了Al-Nd合金, XRD分析结果表明, 形成的合金含Al₂Nd相. 而在活性Al阴极上电解提取Nd, 获得的Al-Nd合金含Al₃Nd相.

关键词 ： LiCl-KCl熔盐, 电解提取, 镧系元素, Al-Nd合金

Abstract：

Based on the understanding of oxide spent fuel reprocessing, the AlCl₃ was selected as chlorinating agent to directly chloridize spent fuel. At the same time, Nd could be extracted by co-deposition with the intro duction of Al³⁺. This process could be realized by the purpose of electrochemical extraction. The electrochemical behavior of Nd(III) ions was investigated in LiCl-KCl-AlCl₃-Nd₂O₃melt on W and Al electrodes at 753 K. Simultaneously, the chlorination effects of Nd₂O₃ by AlCl₃ was also studied. Using Nd₂O₃as raw material, Al-Nd alloy was obtained via electrolytic extraction Nd on W and Al electrodes. On the W electrode, no reduction signal of Nd(III) was detected in the cyclic voltammogram of LiCl-KCl-Nd₂O₃ melt. After the addition of AlCl₃, three electrochemical signals for three Al-Nd intermetallic compounds from the underpotential deposition of Nd on pre-deposited Al substrate were observed. On the Al electrode, two formation signals of Al-Nd intermetallic compounds were observed in the LiCl-KCl-AlCl₃-Nd₂O₃ melt. The results show that AlCl₃ can effectively chloridize Nd₂O₃. Nd was extracted by galvanostatia electrolysis on the W electrodes under -2 A, and Al-Nd alloy was obtained. The XRD results suggest that Al₂Nd phase is formed. However, when the electrolytic extraction of Nd was carried out on active Al electrode, Al₃Nd phase was formed in Al-Nd alloy.

Key words： LiCl-KCl melt electrolytic extraction lanthanide element Al-Nd alloy

收稿日期: 2015-11-11

基金资助:* 国家自然科学基金项目91226201, 91326113和51574097, 黑龙江省科学基金LC2016018, 黑龙江博士后科研启动及特别资助科学基金项目LBH-Q15019, LBH-Q15020和LBH-TZ0411, 以及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和HEUCFQ1415资助

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图1 W电极上LiCl-KCl-Nd2O3熔盐体系中添加AlCl3前后得到的循环伏安曲线

图2 LiCl-KCl-AlCl3-Nd2O3熔盐体系在不同的换向电势下得到的循环伏安曲线

图3 W电极上LiCl-KCl-Nd2O3-AlCl3熔盐体系中得到的方波伏安曲线

图4 W电极上LiCl-KCl-AlCl3-Nd2O3熔盐体系-2.4 V下恒电位电解20 s后得到的开路计时电位曲线

图5 在Al电极上LiCl-KCl-AlCl3熔盐体系中加入Nd2O3得到的循环伏安曲线

图6 Al电极上LiCl-KCl-Nd2O3-AlCl3熔盐体系中得到的方波伏安曲线

图7 在Al电极上, 753 K下LiCl-KCl-Nd2O3-AlCl3熔盐体系中-2.2 V恒电位电解10 s得到的开路计时电位曲线

图8 在Al电极上, LiCl-KCl-AlCl3 (6%)-Nd2O3 (3%)熔盐体系中恒电流电解得到的样品的XRD谱

图9 在W电极上, LiCl-KCl-AlCl3 (15%)-Nd2O3 (1.5%)熔盐体系中恒流电解得到的样品的XRD谱

图10 973 K时LiCl-KCl-AlCl3 (15%)-Nd2O3 (1.5%)熔盐体系中得到的Al-Li-Nd合金的SEM像及元素面扫描图

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