Effect of rotation rate on the recovery of Nd-Fe-B sludge via rotation-reduction diffusion method

Article Materials Science, Multidisciplinary

Recovery of rare earth elements from permanent magnet scraps by pyrometallurgical process

Yu-Yang Bian et al.

Summary: A high-temperature pyrometallurgical process was developed to recover valuable rare earth elements from Nd-Fe-B permanent magnet scraps. By pulverizing and oxidizing the magnet scraps, the rare earth elements were extracted as oxides while separating Fe and B as metal phase. Temperature and reaction time were found to be crucial for improving the purity of rare earth oxides.

RARE METALS (2022)

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Article Materials Science, Multidisciplinary

Nd-Fe-B: From sludge waste to powders via purification and modified Ca-reduction reaction process

Haibo Xu et al.

Summary: The oil-based Nd-Fe-B sludge waste was successfully recycled to high-performance Nd2Fe14B magnetic powders through purification and modified Ca-reduction reaction method, reducing cost and promoting resource reuse. By optimizing the Ca-reduction diffusion parameters, the recycled powders exhibited improved dispersion, uniform particle sizes, and excellent orientation.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS (2022)

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Article Chemistry, Physical

Reaction mechanism of Ca-reduction diffusion process used for sustainable recycling Nd-Fe-B sludge

Haibo Xu et al.

Summary: The reduction diffusion (RD) process for Nd-Fe-B sludge has been successfully applied to synthesize recycled Nd2Fe14B magnetic powders with low impurity content and uniform particle size distribution. The sintered magnets prepared using the recycled powders exhibited excellent magnetic properties. The reaction mechanism of RD method for sludge waste recovery and the kinetics of the reaction were clarified based on experimental studies and thermo-kinetic analysis.

JOURNAL OF ALLOYS AND COMPOUNDS (2022)

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Article Multidisciplinary Sciences

Four-step eco-friendly energy efficient recycling of contaminated Nd2Fe14B sludge and coercivity enhancement by reducing oxygen content

Syed Kamran Haider et al.

Summary: This study presents a simple four-step process to recycle Nd2Fe14B sludge with about 10% contaminants, and successfully obtain products with improved magnetic properties. Through chemical methods, contaminants were removed and the magnetic properties were significantly enhanced, demonstrating the feasibility of complete recycling of Nd2Fe14B sludge.

SCIENTIFIC REPORTS (2021)

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Article Engineering, Multidisciplinary