The extraction of NdFeB magnets from automotive scrap rotors using hydrogen

Abstract

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Processability and Separability of Commercial Anti-Corrosion Coatings Produced by In Situ Hydrogen-Processing of Magnetic Scrap (HPMS) Recycling of NdFeB

“…Good corrosion protection is also beneficial for HPMS recycling, as the high oxygen uptake in EOL magnets leads to Nd oxides that prevent proper wetting of the grain boundaries during re-sintering of the HPMS powders. This impairs the decoupling of the grains, reduces coercivity and affects the density and thus the remanence in recycled magnets [ 39 , 44 ]. Secondly, easy removal of the magnets from the array and good separability of the coating from the magnetic material are key to successful recycling.…”

Insight into the mechanism on co-leaching of REEs and Fe from NdFeB sludge: Elucidating phase transformation and co-leaching kinetics

“…The recycling of NdFeB waste has been extensively investigated in recent years, encompassing methods such as hydrochloric acid preferential dissolution, complete dissolution extraction, electrochemistry, and microwave-assisted techniques (Venkatesan and sun et al, 2018;Venkatesan and Hoogerstraete et al, 2018;Awais et al, 2020;Behera and Parhi, 2019;Kumari et al, 2021). Among them, the hydrochloric acid preferential dissolution method was the most widely employed technique for production and application (Du et al, 2023).…”

Determination of Boron in NdFeB Alloy by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

“…With the rapid development of new energy vehicles, wind power generation, robots and other industries, as well as the trend of miniaturization and light weight of instruments and equipment, the amount of NdFeB alloy as a key material is increasing year by year. The main components of NdFeB alloy are rare earth, iron and boron, among which the content of boron has a great influence on the performance of the alloy [3][4]. Therefore, the accurate determination of boron content in NdFeB alloy is an important part of the quality control of the alloy.…”