scholarly journals Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 841 ◽  
Author(s):  
Yuanbo Zhang ◽  
Foquan Gu ◽  
Zijian Su ◽  
Shuo Liu ◽  
Corby Anderson ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnet ◽  
Economic Potential ◽  
Selective Leaching ◽  
Processing Efficiency ◽  
Technical Challenge ◽  
Extraction Processes ◽  
Ndfeb Permanent Magnet

NdFeB permanent magnet scrap is regarded as an important secondary resource which contains rare earth elements (REEs) such as Nd, Pr and Dy. Recovering these valuable REEs from the NdFeB permanent magnet scrap not only increases economic potential, but it also helps to reduce problems relating to disposal and the environment. Hydrometallurgical routes are considered to be the primary choice for recovering the REEs because of higher REEs recovery and its application to all types of magnet compositions. In this paper, the authors firstly reviewed the chemical and physical properties of NdFeB permanent magnet scrap, and then carried out an in-depth discussion on a variety of hydrometallurgical processes for recovering REEs from the NdFeB permanent magnet scrap. The methods mainly included selective leaching or complete leaching processes followed by precipitation, solvent extraction or ionic liquids extraction processes. Particular attention is devoted to the specific technical challenge that emerges in the hydrometallurgical recovery of REEs from NdFeB permanent magnet scrap and to the corresponding potential measures for improving REEs recovery by promoting the processing efficiency. This summarized review will be useful for researchers who are developing processes for recovering REEs from NdFeB permanent magnet scrap.

scholarly journals Recovery of Rare Earth Elements (REEs) Using Ionic Solvents

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1202
Author(s):  
Guilhem Arrachart ◽  
Julien Couturier ◽  
Sandrine Dourdain ◽  
Clément Levard ◽  
Stéphane Pellet-Rostaing
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
End Of Life ◽  
Mine Tailings ◽  
Industrial Waste ◽  
Deep Eutectic Solvents ◽  
Secondary Sources ◽  
Advanced Technologies ◽  
Extraction Processes

Rare earth elements (REEs) are becoming more and more significant as they play crucial roles in many advanced technologies. Therefore, the development of optimized processes for their recovery, whether from primary resources or from secondary sources, has become necessary, including recovery from mine tailings, recycling of end-of-life products and urban and industrial waste. Ionic solvents, including ionic liquids (ILs) and deep-eutectic solvents (DESs), have attracted much attention since they represent an alternative to conventional processes for metal recovery. These systems are used as reactive agents in leaching and extraction processes. The most significant studies reported in the last decade regarding the recovery of REEs are presented in this review.

scholarly journals Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

2021 ◽  
Vol 12 (2) ◽  
pp. 52
Author(s):  
Ali Al-Qarni ◽  
Ayman EL-Refaie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnet ◽  
Electric Vehicles ◽  
Scaling Up ◽  
Electrical Machines ◽  
Mechanical Structure ◽  
Physical Isolation ◽  
Rotational Components ◽  
Rare Earth Content

This paper covers a new emerging class of electrical machines, namely, Magnetic Gears (MGs) and Magnetically Geared Machines (MGMs). This particular kind of gears/machines is capable of either scaling up or down the revolutions-per-minute to meet various load profiles as in the case of mechanical gearboxes, but with physical isolation between the rotating components. This physical isolation between the rotational components leads to several advantages in favor of MGs and MGMs over mechanical gearboxes. Although MGs and MGMs can potentially provide a solution for some of the practical issues of mechanical gears, MGs and MGMs have two major challenges that researchers have been trying to address. Those challenges are the high usage of rare-earth Permanent Magnet (PM) materials and the relatively complex mechanical structure of MGs and MGMs, both of which are a consequence of the multi-airgap design. This paper presents designs that reduce the PM rare-earth content for Electric Vehicles (EVs). Additionally, the paper will ensure having practical designs that do not run the risk of permanent demagnetization. The paper will also discuss some new designs to simplify the mechanical structure.

Recovery of rare earth elements with ionic liquids

2017 ◽  
Vol 19 (19) ◽  
pp. 4469-4493 ◽  
Author(s):  
Kaiying Wang ◽  
Hertanto Adidharma ◽  
Maciej Radosz ◽  
Pingyu Wan ◽  
Xin Xu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements

This review focuses on the recovery of REEs from waste with ionic liquids (ILs) as dilutants and extractants to tackle the REE supply challenge.

Selectivity potential of ionic liquids for metal extraction from slags containing rare earth elements

2017 ◽  
Vol 169 ◽  
pp. 59-67 ◽  
Author(s):  
Ayfer Kilicarslan Sahin ◽  
Daniel Voßenkaul ◽  
Nicolas Stoltz ◽  
Srecko Stopic ◽  
Muhlis Nezihi Saridede ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Extraction
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