A green recycling method of special-shaped neodymium-iron-boron magnetic steel

By employing inert atmosphere pyrolysis, composite mechanical dissociation, and green selective leaching technologies, and utilizing the synergistic effect of modified Fe3O4 magnetic nanoparticles and modified zirconium phosphate nanosheets, the problem of insufficient selective leaching of irregularly shaped NdFeB magnets was solved, achieving efficient and green recycling, improving rare earth leaching rate and selectivity, and reducing iron dissolution rate, which meets the development requirements of green metallurgy.

CN122428124APending Publication Date: 2026-07-21四川源莱顺稀土新材料有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
四川源莱顺稀土新材料有限公司
Filing Date
2026-04-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently and environmentally recycle irregularly shaped NdFeB magnets, especially during the selective leaching stage. The low rare earth leaching rate and poor selectivity of leaching matrix elements such as iron and boron lead to complex subsequent rare earth separation and purification processes, resulting in a heavy environmental burden.

Method used

Inert atmosphere pyrolysis, composite mechanical dissociation, and green selective leaching technology were employed. Modified Fe3O4 magnetic nanoparticles and modified zirconium phosphate nanosheets were used to pyrolyze magnetic steel components under an inert atmosphere. Through the synergistic effect of the thiol groups of the modified Fe3O4 magnetic nanoparticles and the modified zirconium phosphate nanosheets, selective leaching of rare earth elements and effective inhibition of iron were achieved. Subsequently, extraction and separation were carried out using a P507-kerosene system.

Benefits of technology

This method improves the rare earth leaching rate, reduces the iron dissolution rate, and enhances the rare earth/iron selectivity coefficient, thus achieving efficient and green recycling of irregularly shaped NdFeB magnets, which meets the development requirements of green metallurgy.

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Abstract

The application relates to a rare earth permanent magnet material recycling technical field, in particular to a green recycling method of special-shaped neodymium iron boron magnetic steel, which is characterized by the following steps: through inert atmosphere pyrolysis, composite mechanical dissociation, green selective leaching, extraction separation and comprehensive recycling, finally realizing green recycling of the special-shaped neodymium iron boron magnetic steel. The modified Fe3O4 magnetic nanoparticles are modified by mercapto groups, and the Fe 2+ forms a stable complex with the pyrocatechol groups of the PDA layer 3+ has strong complexing ability, and reduces the free iron concentration in the leaching solution. The modified zirconium phosphate nanosheet is selectively adsorbed on the surface of the magnetic steel iron phase, the surface P-OH / P-O ‑ groups of the modified zirconium phosphate nanosheet are in situ reacted with Fe 2+ / Fe 3+ to generate a phosphorus iron precipitate passivation layer, the surface of the iron phase is covered, the contact between the iron phase and the leaching solution is physically blocked from the solid phase, and the further dissolution of iron is inhibited from the source. The modified zirconium phosphate nanosheet accelerates the dissolution of rare earths.
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