在AlCl_3的辅助下从LiCl-KCl-AlCl_3-Nd_2O_3熔盐中电解提取Nd

ELECTROLYSIS EXTRACTION OF NEODYMIUM FROM Li Cl-KCl-AlCl_3-Nd_2O_3 MELTS WITH THE ASSISTANCE OF AlCl_3

研究了753 K时Nd在W和Al电极上Li Cl-KCl-AlCl_3-Nd_2O_3体系中的电化学行为,同时研究了AlCl_3对Nd_2O_3的氯化作用,并直接以Nd_2O_3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,Li Cl-KCl-Nd_2O_3体系中的循环伏安曲线中并未观察到Nd还原的信号.加入AlCl_3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Li Cl-KCl-AlCl_3-Nd_2O_3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,AlCl_3能有效地氯化Nd_2O_3.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.

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 introduction 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-Nd2O3 melt on W and Al electrodes at 753 K. Simultaneously, the chlorination effects of Nd2O3 by AlCl3 was also studied. Using Nd2O3 as 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 electrochemi- cal 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.