Method for preparing NdFeB (neodymium-iron-boron) magnet by waste materials

A neodymium-iron-boron and magnet technology, applied in the field of magnetic materials, can solve the problems of complex processing process, insufficient magnetic properties of neodymium-iron-boron magnets, low recycling rate, etc., and achieves good comprehensive performance, simple and feasible method, and recycling rate. high effect

Inactive Publication Date: 2015-04-29
NINGBO GERONGLI MAGNETIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can play a certain role in recycling, the processing process is relatively complicated, and only a small amount of waste is added to the new ingredients, the recycling rate is not high, and the magnetic properties of NdFeB magnets are not good enough.

Method used

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  • Method for preparing NdFeB (neodymium-iron-boron) magnet by waste materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Waste pre-treatment: put the waste generated during the production of N38 NdFeB magnets in Na with a mass fraction of 35% and a temperature of 40 °C 2 CO 3 Soak in the solution for 5 minutes to clean and dry, and then crush it into 10mm particles with a crusher under the protection of inert gas.

[0023] Powder making: adding rare earth metals with a content of 3.0%-5.0% of the total mass of the NdFeB magnet to the above waste particles and hydrogen crushing treatment to obtain crushed powder with an average particle size of 10.0 μm, and then adding 0.01% triethanolamine boron Ester, after mixing evenly, perform jet milling to obtain a fine powder with an average particle size of 3.0 μm, and stir it with a mixer for 1.5 hours; the rare earth metals are specifically 0.5% Tb, 0.5% Dy, 1.0% Nd, 0.8% Ce;

[0024] Among them, the hydrogen crushing treatment includes two processes of hydrogen absorption and dehydrogenation, that is, after the particles crushed by the crushe...

Embodiment 2

[0028] Waste pre-treatment: put the leftovers produced during the post-processing of N38 NdFeB magnets in Na with a mass fraction of 45% and a temperature of 50 °C 2 CO 3 Soak in the solution for 6 minutes to clean and dry, and then crush it into 12mm particles with a crusher under the protection of inert gas.

[0029] Powder making: add rare earth metals with a content of 3.0%-5.0% of the total mass of the NdFeB magnet to the above waste particles and undergo hydrogen crushing to obtain crushed powder with an average particle size of 12.0 μm, and then add 0.02% N-deca Dialkyl bis-quaternary ammonium salt, after mixing evenly, carry out jet milling to obtain a fine powder with an average particle size of 4.0 μm, and stir with a mixer for 2.0 h; wherein the rare earth metal is specifically 0.8% Tb, 0.8% Dy, 1.5% Nd, 0.9% Ce;

[0030] Among them, the hydrogen crushing treatment includes two processes of hydrogen absorption and dehydrogenation, that is, after the particles crus...

Embodiment 3

[0034] Waste pretreatment: put N38 waste NdFeB magnets in Na with a mass fraction of 55% and a temperature of 60 °C 2 CO 3 Soak in the solution for 7 minutes to clean and dry, and then crush it into 14mm particles with a crusher under the protection of inert gas.

[0035] Powder making: add rare earth metals with a content of 3.0%-5.0% of the total mass of the NdFeB magnet to the above waste particles and undergo hydrogen crushing to obtain crushed powder with an average particle size of 13.0 μm, and then add 0.01% triethanolamine boron Ester and 0.01% glyceryl stearate, after mixing evenly, carry out jet milling to obtain a fine powder with an average particle size of 4.0 μm, and stir with a mixer for 2.5 hours; wherein the rare earth metals are specifically 1.0% Tb and 1.0% Dy , 1.5% Nd, 1.0% Ce;

[0036] Among them, the hydrogen crushing treatment includes two processes of hydrogen absorption and dehydrogenation, that is, after the particles crushed by the crusher are add...

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Abstract

The invention relates to an NdFeB (neodymium-iron-boron) magnet, in particular to a method for preparing the NdFeB magnet by waste materials, and belongs to the technical field of magnetic materials. The preparing method of the NdFeB magnet comprises the following steps that firstly, NdFeB magnet waste materials are cleaned and are dried through being blown, the NdFeB magnet waste materials are crushed into particles being 10 to 15mm by a crushing machine, rare earth metal is added into the particles, then, hydrogen crushing treatment is carried out to obtain crushed powder, and next, antioxidants are added for airflow grinding to obtain fine powder with the average particle diameter being 3.0 to 4.0 mu. m; next, lubricating agents are added, orientation is carried out under the protection atmosphere of nitrogen gas, in addition, pressing forming is carried out, and finally, NdFeB magnet finished products are obtained through discharging plasma sintering, secondary tempering heat treatment and surface treatment. The method has the advantages that waste materials are used as major raw materials, the simple and feasible preparing method is adopted, the recovery and utilization rate of the waste materials is effectively improved, in addition, Tb, Dy, Nd and Ce are added and compounded in the preparing process, and the obtained NdFeB magnet has better coercive force, residual magnetism and magnetic energy product.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet, in particular to a method for preparing a neodymium-iron-boron magnet from waste materials, and belongs to the technical field of magnetic materials. Background technique [0002] As a new generation of rare earth permanent magnet materials, NdFeB magnets have the characteristics of high remanence, high coercive force and high magnetic energy product, and are the permanent magnet materials with the strongest comprehensive magnetic properties in the world today. With the development of electronic information, automobile and machinery manufacturing industry, NdFeB magnets have also developed rapidly, especially now that people's awareness of environmental protection is getting stronger and stronger. The demand for NdFeB permanent magnets continues to grow. [0003] With the continuous replacement and scrapping of automobiles, electronic devices, and other equipment, a large amount of NdFeB magnet w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F8/00
CPCY02W30/50
Inventor 钱寅
Owner NINGBO GERONGLI MAGNETIC IND
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