HDDR as advanced processing method and recycling technology to address the rare-earth resource criticality in high performance Nd2Fe14B magnets production

Poenaru, Iuliana; Patroi, Eros Alexandru; Pătroi, Delia; Iorga, Alexandru; Manta, E.

doi:10.1016/j.jmmm.2023.170777

Cited by 8 publications

(1 citation statement)

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“…The hydrogen decrepitation process takes place at temperatures between room temperature and 400 • C, after which, through the reversible adsorption of hydrogen gas by the NdFeB alloys, friable, demagnetized powders with particle sizes between 6 and 600 µm are obtained after hydrogenation [47,48]. Unlike HD, the HDDR process operates at higher temperatures (750-950 • C), resulting in finer anisotropic powders (the easy magnetic axes of the powder particles are aligned in one direction) with a grain size of up to about 300 nm [30,49]. In Table 1, the most recent representative studies for each recycling laboratory-scale technology are selectively presented.…”

Section: Resources Needed For Recycling and Environmental Impact Dama...mentioning

confidence: 99%

Green and Sustainable Rare Earth Element Recycling and Reuse from End-of-Life Permanent Magnets

Cherkezova-Zheleva,

Burada,

Sobetkii (Slobozeanu)

et al. 2024

Metals

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Rare earth elements (REEs) are key materials for the development of renewable energy devices such as high-power magnets for wind turbines, electric vehicles, or fuel cells for hydrogen generation, aiming to fulfill the objectives of the European Green Deal for a carbon-neutral economy. The increased demand for REEs and their criticality strongly require the improvement of their extraction technologies from primary resources and the enhancement of their circularity reuse rate from secondary resources. The aim of this paper is to focus attention on the possibilities offered by emerging methods such as microwave (MW) treatment and mechanochemistry in waste electric and electronic equipment (WEEE) processing and the reuse of end-of-life (EoL) magnets, directed toward the tailoring of rational REE material flows. The discussed investigation examples explore some key features of conventional and new methods for efficient, environmentally friendly, and scalable REE extraction and reuse, with the final goal of producing recycled NdFeB powders, with potential use in the redesign and fabrication of new REE-based magnets.

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Section: Resources Needed For Recycling and Environmental Impact Dama...mentioning

confidence: 99%