Using Chlorine Gas to Recover Rare Earth Metals from End-of-Life Permanent Magnets

JOM ◽  
2021 ◽  
Author(s):  
Valery Kaplan ◽  
Ellen Wachtel ◽  
Konstantin Gartsman ◽  
Yishay Feldman ◽  
Kyoung-Tae Park ◽  
...  
Keyword(s):  
Rare Earth ◽  
End Of Life ◽  
Permanent Magnets ◽  
Rare Earth Metals ◽  
Chlorine Gas

scholarly journals Extraction of Rare Earth Metal Ions with an Undiluted Hydrophobic Pseudoprotic Ionic Liquid

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 502
Author(s):  
Michiaki Matsumoto ◽  
Takuya Yamaguchi ◽  
Yoshiro Tahara
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Permanent Magnets ◽  
Rare Earth Metals ◽  
Aqueous Media ◽  
Earth Metal ◽  
Decanoic Acid ◽  
Experimental Conditions ◽  
Low Viscosity ◽  
Metal Recycling

Recovering and concentrating rare earth metals (Nd and Dy) from waste permanent magnets rather than discarding them into the environment without pretreatment is critical for metal recycling and environmental responsibility. In this work, we used an undiluted hydrophobic pseudoprotic ionic liquid composed of trioctylamine and decanoic acid as an extractant to separate rare earth metals from aqueous media with a solvent extraction technique. This ionic liquid proved to be excellent with low viscosity and extractability reaching 100% for Nd and Dy in the presence of salts like sodium chloride and sodium nitrate. In acidic media, extractability decreased with increasing acid concentrations. Under all our experimental conditions, the rare earth metals (Nd and Dy) were found to be preferentially extracted compared to nickel with the distribution ratios of Dy higher than those of Nd.

scholarly journals Exploiting end-of-life lamps fluorescent powder e-waste as a secondary resource for critical rare earth metals

2021 ◽  
Vol 164 ◽  
pp. 105153 ◽  
Author(s):  
Ajay B. Patil ◽  
Mohamed Tarik ◽  
Rudolf P.W.J. Struis ◽  
Christian Ludwig
Keyword(s):  
Rare Earth ◽  
End Of Life ◽  
Rare Earth Metals ◽  
Fluorescent Powder ◽  
Secondary Resource

scholarly journals Modeling the Value Recovery of Rare Earth Permanent Magnets at End-of-Life

Procedia CIRP ◽  
2015 ◽  
Vol 29 ◽  
pp. 680-685 ◽  
Author(s):  
Liang Cong ◽  
Hongyue Jin ◽  
Pete Fitsos ◽  
Timothy McIntyre ◽  
Yuehwern Yih ◽  
...  
Keyword(s):  
Rare Earth ◽  
End Of Life ◽  
Permanent Magnets ◽  
Value Recovery

Structure of alloys for permanent magnets based on compounds of rare-earth metals

2000 ◽  
Vol 42 (8) ◽  
pp. 314-318 ◽  
Author(s):  
Yu. D. Yagodkin ◽  
A. S. Lileev ◽  
V. P. Menushenkov ◽  
Yu. A. Skakov
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Rare Earth Metals

Hydrogen as a working atmosphere for manufacturing permanent magnets based on rare-earth metals

2009 ◽  
Vol 45 (2) ◽  
pp. 268-278 ◽  
Author(s):  
V. V. Fedorov ◽  
I. I. Bulyk ◽  
V. V. Panasyuk
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Rare Earth Metals

Production of Permanent Magnets for Magnetically Hard Alloys Using Rare-Earth Metals

Metallurgist ◽  
2019 ◽  
Vol 63 (5-6) ◽  
pp. 462-468 ◽  
Author(s):  
S. S. Shumkin ◽  
P. A. Prokof’ev ◽  
M. Yu. Semenov
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Rare Earth Metals ◽  
Hard Alloys ◽  
Magnetically Hard

Hydrometallurgical Process for Selective Extraction of Nd and Rare-Earth Metals from End-of-Life Hard Disk Drives NdFeB Magnet Scrap

2020 ◽  
Vol 845 ◽  
pp. 81-86
Author(s):  
Panya Buahombura ◽  
Anuthai Kareram ◽  
Waraporn Piyawit ◽  
Sarum Boonmee
Keyword(s):  
Rare Earth ◽  
Acid Solution ◽  
End Of Life ◽  
Rare Earth Metals ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Hydrometallurgical Process ◽  
Disk Drives ◽  
Ndfeb Magnet ◽  
Xrd Pattern

This paper proposed a recycling process for neodymium-iron-boron (NdFeB) magnet scrap from the end-of-life (EOL) of hard disk drives by using hydrometallurgical process. Initial chemical composition of NdFeB magnet scrap was consisted of 25.37%Nd, 6.53%Pr, 0.90%Co, 3.63%B and 63.57%Fe. After de-magnetization and crushing into proper size, magnet scraps were directly leached by H2SO4 solution. More than 90% dissolved into acid solution with remaining small amount of residuals and Ni-coated metal. Neodymium precipitated from leached solution by pH-control to the optimum condition at pH 0.6 using NaOH solution. Solid Nd-precipitates XRD pattern was observed in form of NaNd (SO4)2.(H2O) and FeSO4.(H2O). Elemental analysis of Nd-precipitates by WD-XRF. The precipitates contained 26.50%Nd, 8.46%Pr and 1.19%Fe. In order to elimination of Fe, Nd-precipitates was leached by using H2SO4 solution to dissolve FeSO4.(H2O) into acid solution to obtain high concentration of Nd and rare-earth metals (REMs) compound. As a result, XRD pattern of Nd-compound after Fe-removal confirmed that the high purity NaNd (SO4)2.(H2O) compound was obtained. The final composition of precipitates analyzed by WD-XRF was 26.36%Nd, 8.13%Pr with Fe as low as 0.14%Fe.

Mechanism and microstructure evolution of high temperature oxidation of end-of-life NdFeB rare earth permanent magnets

2021 ◽  
Vol 182 ◽  
pp. 109290
Author(s):  
Deddy C. Nababan ◽  
Reiza Mukhlis ◽  
Yvonne Durandet ◽  
Mark I. Pownceby ◽  
Leon Prentice ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
End Of Life ◽  
Microstructure Evolution ◽  
High Temperature Oxidation ◽  
Permanent Magnets ◽  
Temperature Oxidation

Environment-Friendly Recycling Process for Rare Earth Metals in End-of-Life Electric Products

2014 ◽  
pp. 103-106 ◽  
Author(s):  
Tomonori Saeki ◽  
Tomohiko Akahori ◽  
Yu Miyamoto ◽  
Masayuki Kyoi ◽  
Masahide Okamoto ◽  
...  
Keyword(s):  
Rare Earth ◽  
End Of Life ◽  
Rare Earth Metals ◽  
Recycling Process ◽  
Environment Friendly
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