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Open AccessReview

Research Progress in Preparation and Purification of Rare Earth Metals

1
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2
Baotou Rare Earth R&D Center, Chinese Academy of Sciences, Baotou 014000, China
3
School of Metallurgy, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(10), 1376; https://doi.org/10.3390/met10101376
Received: 28 August 2020 / Revised: 30 September 2020 / Accepted: 9 October 2020 / Published: 15 October 2020
The purity of rare earth metals is one of the most important factors to research and develop high technique materials. However, high purity rare earth metals are not easily achieved. This review summarizes the preparation and purification methods of rare earth metals. First, the preparation principle and process of molten salt electrolysis and metal thermal reduction are introduced. The main sources of metallic impurities and interstitial impurities in rare earth metals as well as the action mechanism of reducing the concentration of different impurities are analyzed and summarized. Then, the purification principle and process of vacuum distillation, arc melting, zone melting, and solid state electromigration are also discussed. Furthermore, the removal effect and function rule of metallic impurities and interstitial impurities in rare earth metals are outlined. Finally, the crucial issues in the development of high purity rare earth metals are put forward, and the development direction of high purity rare earth metals in future are pointed out on this basis. View Full-Text
Keywords: rare earth metals; purity; impurity concentration; preparation; purification rare earth metals; purity; impurity concentration; preparation; purification
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Liu, H.; Zhang, Y.; Luan, Y.; Yu, H.; Li, D. Research Progress in Preparation and Purification of Rare Earth Metals. Metals 2020, 10, 1376.

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