An Innovative Process Using Only Water and Sodium Chloride for Recovering Rare Earth Elements from Nd–Fe–B Permanent Magnets Found in the Waste of Electrical and Electronic Equipment

2016 ◽  
Vol 4 (12) ◽  
pp. 6455-6462 ◽  
Author(s):  
Nicolas Maât ◽  
Virginie Nachbaur ◽  
Rodrigue Lardé ◽  
Jean Juraszek ◽  
Jean-Marie Le Breton
Keyword(s):  
Rare Earth ◽  
Sodium Chloride ◽  
Rare Earth Elements ◽  
Permanent Magnets ◽  
Electronic Equipment ◽  
Innovative Process

Process optimization for acidic leaching of rare earth elements (REE) from waste electrical and electronic equipment (WEEE)

2021 ◽  
Author(s):  
Ayse Yuksekdag ◽  
Borte Kose-Mutlu ◽  
Bihter Zeytuncu-Gokoglu ◽  
Mustafa Kumral ◽  
Mark R. Wiesner ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Process Optimization ◽  
Electronic Equipment

A DETERMINATION OF THE SHEAR FORCE OF THIN HIGH-COERCIVITY PERMANENT MAGNETS MADE FROM THE ALLOY WITH RARE-EARTH ELEMENTS

2021 ◽  
pp. 24-30
Author(s):  
A. Ya. Krasilʼnikov ◽  
A. A. Krasilʼnikov
Keyword(s):  
Rare Earth ◽  
Magnetic Flux ◽  
Rare Earth Elements ◽  
Standard Method ◽  
Shear Force ◽  
Permanent Magnets ◽  
High Coercivity ◽  
Research Results ◽  
Magnetic Couplings

The article considers the possibility of using a standard method for calculating the shear force of thin, high-coercivity neodymium–iron–boron type permanent magnets in magnetic clutches (couplings). The research results allowed to introduce a correction coefficients in the method of calculating the transmitting torque in magnetic clutches (couplings) with thin magnets. The possibility of 08H22N6T brand steel using for magnetic flux conductors manufacturing in a magnetic couplings.

Rare earth elements and permanent magnets (invited)

2012 ◽  
Vol 111 (7) ◽  
pp. 07A721 ◽  
Author(s):  
Peter C. Dent
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnets

scholarly journals Selective Roasting of Nd–Fe‒B Permanent Magnets as a Pretreatment Step for Intensified Leaching with an Ionic Liquid

2019 ◽  
Vol 6 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Martina Orefice ◽  
Amy Van den Bulck ◽  
Bart Blanpain ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnets ◽  
Metallic Phase ◽  
Process Step ◽  
Mechanical Removal ◽  
Oxidative Roasting ◽  
Roasting Temperature ◽  
The Rare Earth

AbstractOxidative roasting of Nd–Fe‒B permanent magnets prior to leaching improves the selectivity in the recovery of rare-earth elements over iron. However, the dissolution rate of oxidatively roasted Nd–Fe‒B permanent magnets in acidic solutions is very slow, often longer than 24 h. Upon roasting in air at temperatures above 500 °C, the neodymium metal is not converted to Nd2O3, but rather to the ternary NdFeO3 phase. NdFeO3 is much more difficult to dissolve than Nd2O3. In this work, the formation of NdFeO3 was avoided by roasting Nd–Fe‒B permanent magnet production scrap in argon atmosphere, having an oxygen content of $$ p_{{{\text{O}}_{2} }} \, \le \,10^{ - 20} \;{\text{atm}}, $$pO2≤10-20atm, with the addition of 5 wt% of carbon as an iron reducing agent. For all the non-oxidizing iron roasting conditions investigated, the iron in the Nd–Fe‒B scrap formed a cobalt-containing metallic phase, clearly distinct from the rare-earth phase at microscopic level. The thermal treatment was optimized to obtain a clear phase separation of metallic iron and rare-earth phase also at the macroscopic level, to enable easy mechanical removal of iron prior to the leaching step. The sample roasted at the optimum conditions (i.e., 5 wt% carbon, no flux, no quenching step, roasting temperature of 1400 °C and roasting time of 2 h) was leached in the water-containing ionic liquid betainium bis(trifluoromethylsulfonyl)imide, [Hbet][Tf2N]. A leaching time of only 20 min was sufficient to completely dissolve the rare-earth elements. The rare-earth elements/iron ratio in the leachate was about 50 times higher than the initial rare-earth elements/iron ratio in the Nd–Fe‒B scrap. Therefore, roasting in argon with addition of a small amount of carbon is an efficient process step to avoid the formation of NdFeO3 and to separate the rare-earth elements from the iron, resulting in selective leaching for the recovery of rare-earth elements from Nd–Fe‒B permanent magnets.

Determination of the Shear Force of High-Coercivity Permanent Magnets Produced from A 5-MM Thick Alloy of Rare-Earth Elements

2020 ◽  
Vol 55 (11-12) ◽  
pp. 1007-1015
Author(s):  
A. Ya. Krasil’nikov ◽  
A. A. Krasil’nikov ◽  
D. V. Taranov
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Shear Force ◽  
Permanent Magnets ◽  
High Coercivity

Recovery of Rare Earth Elements from Waste Permanent Magnets Leach Liquors

2020 ◽  
pp. 335-345 ◽  
Author(s):  
Rajesh Kumar Jyothi ◽  
Kyeong Woo Chung ◽  
Chul-Joo Kim ◽  
Ho-Sung Yoon
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnets

ChemInform Abstract: Rare Earth Elements and Permanent Magnets (Invited)

ChemInform ◽  
2012 ◽  
Vol 43 (25) ◽  
pp. no-no
Author(s):  
Peter C. Dent
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnets

Identification and recovery of rare-earth permanent magnets from waste electrical and electronic equipment

2017 ◽  
Vol 68 ◽  
pp. 482-489 ◽  
Author(s):  
A. Lixandru ◽  
P. Venkatesan ◽  
C. Jönsson ◽  
I. Poenaru ◽  
B. Hall ◽  
...  
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Electronic Equipment
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