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

doi:10.11900/0412.1961.2015.00576

Acta Metall Sin

2016, Vol. 52

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

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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.

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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. Acta Metall Sin, 2016, 52(7): 883-889.

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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

Received: 11 November 2015

Fund: Supported by National Natural Science Foundation of China (Nos.91226201, 91326113 and 51574097), Science Foundation of Heilongjiang Province (No.LC2016018), Scientific Research and Special Foundation of Heilongjiang Postdoctoral Science Foundation (Nos.LBH-Q15019, LBH-Q15020 and LBH-TZ0411) and Foundation for University Key Teacher of Heilongjiang Province and Harbin Engineering University (Nos.1253G016 and HEUCFQ1415)

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	Yun XUE
	Xue YANG
	Yongde YAN
	Milin ZHANG
	Debin JI
	Enyu LI
	Wei HAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00576 OR https://www.ams.org.cn/EN/Y2016/V52/I7/883

Fig.1 Cyclic voltammogram obtained at a W electrode obtained before and after addition of AlCl₃ in LiCl-KCl-Nd₂O₃ melt system (753 K, scan rate is 100 mV/s, i— current density, E— potential)

Fig.2 Cyclic voltammogram obtained at different current limits in LiCl-KCl-AlCl₃-Nd₂O₃ system (753 K, scan rate is 100 mV /s)

Fig.3 Square wave voltammogram of LiCl-KCl-Nd₂O₃-AlCl₃ on a W electrode (753 K, pulse height is 25 mV, potential step is 1 mV, frequency is 10 Hz)

Fig.4 Open circuit transient curve at a W electrode (electrode area S=0.322 cm²) after electrolysis 20 s at a potential of -2.4 V in LiCl-KCl-AlCl₃-Nd₂O₃ melts at 753 K

Fig.5 Cyclic voltammogram obtained on an Al electrode (S=0.322 cm²) and the addition of Nd₂O₃ in LiCl-KCl-AlCl₃ system (753 K, scan rate is 100 mV /s)

Fig.6 Square wave voltammogram of LiCl-KCl-Nd₂O₃-AlCl₃ at 753 K on a Al electrode (S=0.322 cm², pulse height is 25 mV, potential step is 1 mV, frequency is 10 Hz)

Fig.7 Open circuit transient curve on an Al electrode after electrolysis 10 s at a potential of -2.2 V in LiCl-KCl-Nd₂O₃-AlCl₃ melts at 753 K

Fig.8 XRD pattern of the deposits obtained under galvanostatic electrolysis at a Al electrode (S=2.5 cm²) in LiCl-KCl-AlCl₃(6%)-Nd₂O₃(3%) melts at 753 K and 0.6 A for 2.5 h

Fig.9 XRD pattern of the deposits obtained under galvanostatic electrolysis at a W electrode (S=0.322 cm²) in LiCl-KCl-AlCl₃(15%)-Nd₂O₃(1.5%) melts at 973 K and 2 A for 2.5 h

Fig.10 SEM image (a) and elemental mappings of Al (b) and Nd (c) of Al-Li-Nd alloy obtained in LiCl-KCl-AlCl₃(15%)-Nd₂O₃(1.5%) melt system at 973 K

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