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

A rare earth waste and rare earth permanent magnet technology, which is used in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of increased production costs, single shape of the blank, waste of materials, etc., to reduce the cost of recycling, recycling The effect of process environmental protection and improving recycling efficiency

Pending Publication Date: 2021-11-30
赣州综保华瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This embodiment provides a method for preparing a NdFeB rare earth permanent magnet waste regenerated magnet. The preparation method specifically includes the following steps:

[0063] (1) Distinguish the mixed waste of grades N35-N40 containing Ce from the mixed waste of grades N48-N52 not containing Ce, and select 5 kg each. The two kinds of waste materials are then pickled to remove surface oil and scale, and then the waste after pickling is rinsed with a high-pressure water gun, and the waste after washing is dried and stored in a glove box. The pickling liquid is hydrochloric acid with a concentration of 1%, and the surface treatment time is 15s;

[0064] (2) Put the waste materials obtained in (1) into the hydrogen breaking furnace respectively, make the waste absorb hydrogen under the hydrogen pressure environment of 0.1-0.2 MPa, and heat it to Dehydrogenation at 550°C, cool down after the vacuum degree in the furnace is less than 10Pa, and then sieve the coarse...

Embodiment 2

[0070] This embodiment provides a method for preparing a NdFeB rare earth permanent magnet waste regenerated magnet. The preparation method specifically includes the following steps:

[0071] (1) Distinguish the mixed waste of grades N35-N40 containing Ce from the mixed waste of grades N48-N52 not containing Ce, and select 5 kg each. The two kinds of waste materials are then pickled to remove surface oil and scale, and then the waste after pickling is rinsed with a high-pressure water gun, and the waste after washing is dried and stored in a glove box. The pickling liquid is hydrochloric acid with a concentration of 1%, and the surface treatment time is 15s;

[0072] (2) Put the waste materials obtained in (1) into the hydrogen breaking furnace respectively, make the waste absorb hydrogen under the hydrogen pressure environment of 0.1-0.2 MPa, and heat it to Dehydrogenation at 550°C, cool down after the vacuum degree in the furnace is less than 10Pa, and then sieve the coarse...

Embodiment 3

[0078] This embodiment provides a method for preparing a NdFeB rare earth permanent magnet waste regenerated magnet. The preparation method specifically includes the following steps:

[0079] (1) Distinguish the mixed waste of grades N35-N40 containing Ce from the mixed waste of grades N48-N52 not containing Ce, and select 5 kg each. The two kinds of waste materials are then pickled to remove surface oil and scale, and then the waste after pickling is rinsed with a high-pressure water gun, and the waste after washing is dried and stored in a glove box. The pickling liquid is hydrochloric acid with a concentration of 1%, and the surface treatment time is 15s;

[0080] (2) Put the waste materials obtained in (1) into the hydrogen breaking furnace respectively, make the waste absorb hydrogen under the hydrogen pressure environment of 0.1-0.2 MPa, and heat it to Dehydrogenation at 550°C, cool down after the vacuum degree in the furnace is less than 10Pa, and then sieve the coarse...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0266H01F1/0577
Inventor 马强沈保根赵同云王鑫
Owner 赣州综保华瑞新材料有限公司
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