Neodymium-iron-boron rare earth permanent magnet waste regenerated magnet and preparation method thereof

Abstract

The invention provides a neodymium-iron-boron rare earth permanent magnet waste regenerated magnet and a preparation method thereof. The neodymium-iron-boron rare earth permanent magnet waste regenerated magnet comprises main phase crystal grains formed by rare earth waste powder and an R-M alloy layer coating the surfaces of the main phase crystal grains. The preparation method comprises the steps that rare earth waste powder and R-M alloy powder are mixed to obtain mixed fine powder, the mixed fine powder is sequentially subjected to forming, sintering and heat treatment, and the neodymium iron boron rare earth permanent magnet waste regenerated magnet is obtained. According to the invention, the regenerated magnet is prepared by directly utilizing the waste through a short-process controllable preparation process, new materials do not need to be added, the recovery efficiency is greatly improved, the recovery cost is reduced, introduction of chemical reagents in the production process is omitted, the recovery process is more environmentally friendly, a large amount of Ce-containing waste is utilized, and the problem that a large amount of Ce-containing waste is overstocked at present is solved.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and relates to a magnet prepared from NdFeB rare earth permanent magnet waste, in particular to a regenerated magnet from NdFeB rare earth permanent magnet waste and a preparation method thereof. Background technique [0002] Since the advent of sintered NdFeB, due to its excellent magnetic properties, it has developed rapidly and has now become an indispensable functional material in modern industry. China is the largest producer of rare earth permanent magnet materials, with a production capacity of more than 300,000 tons, accounting for more than 80% of the world's total output. In the past 30 years, the application of rare earths in permanent magnet materials in China has increased by more than 70 times, consuming a large amount of scarce rare earth elements such as Pr, Nd, Dy, Tb, etc. There is a large backlog of rare earth elements, resulting in extremely unbalanced u...

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Problems solved by technology

[0006] However, for sintered NdFeB series rare earth permanent magnet materials, due to the limitation of the molding method, the shape of the compact is relatively simple, and a large amount of processing residues will inevitably be generated in the subsequent processing process, resulting in material waste and increased production costs.

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