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Neodymium-iron-boron magnet prepared from waste sintered magnet and method for preparing neodymium-iron-boron magnet from waste

A sintered magnet and NdFeB technology are applied in the fields of NdFeB magnets prepared from waste sintered magnets and NdFeB magnets prepared from scraps, so as to achieve the effects of improving recycling, reducing costs, and reducing waste of resources

Pending Publication Date: 2022-02-18
JIANGXI JLMAG RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste magnetic steel of the present invention does not need to go through the smelting process, and the waste magnetic steel is directly broken into powder and then used. Since the waste magnetic steel directly reused has defects in the grain boundary phase and there are some organic matter and other impurity phases in the recovery process, the present invention introduces The combined use of the first alloy and the second alloy solves the phase-rich defects of waste magnetic steel, greatly improves the magnetic properties, and realizes 100% utilization of waste magnetic steel raw materials. By blending alloys, the grain boundary structure is further improved and the efficiency of grain boundary penetration is improved. , reduce the waste of heavy rare earth resources, and at the same time the process is simple, suitable for large-scale industrial production

Method used

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  • Neodymium-iron-boron magnet prepared from waste sintered magnet and method for preparing neodymium-iron-boron magnet from waste
  • Neodymium-iron-boron magnet prepared from waste sintered magnet and method for preparing neodymium-iron-boron magnet from waste
  • Neodymium-iron-boron magnet prepared from waste sintered magnet and method for preparing neodymium-iron-boron magnet from waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] 1. A alloy preparation

[0199] 1.1 The NdFeB waste is pretreated to remove the coating, degrease, and clean.

[0200] 1.2 Carry out initial crushing of bulk raw materials, and the particle size after crushing is <30mm. The present invention has no special restrictions on the crushing equipment and conditions, and those skilled in the art can choose different equipment according to actual production conditions.

[0201] 1.3 Hydrogen crushing (HD) processing alloy flake production process, hydrogen absorption time is 75min, dehydrogenation at 580°C for 5h, and finally water cooling for 2h to obtain coarse powder A alloy. The composition of Meal A was measured, see Table 1. Table 1 is the composition content of alloy A in Example 1.

[0202] Table 1

[0203] element Pr Nd Dy Ho B Al Cu co Zr Ti Ga Fe Contentwt% 5.7 22.8 0.85 0.53 0.95 0.16 0.1 0.54 0.08 0.05 0.13 margin

[0204] 2. Preparation of Alloy B

[0205] 2....

Embodiment 2

[0243] 1. A alloy preparation

[0244] 1.1 The NdFeB waste is pretreated to remove the coating, degrease, and clean.

[0245] 1.2 Carry out initial crushing of bulk raw materials, and the particle size after crushing is <30mm. The present invention has no special restrictions on the crushing equipment and conditions, and those skilled in the art can choose different equipment according to actual production conditions.

[0246] 1.3 Hydrogen crushing (HD) processing alloy flake production process, hydrogen absorption time is 75min, dehydrogenation at 580°C for 5h, and finally water cooling for 2h to obtain coarse powder A alloy. The composition of Meal A was measured, see Table 4. Table 4 is the composition content of alloy A in Example 2.

[0247] Table 4

[0248]

[0249] 2. Preparation of Alloy B

[0250] 2.1. According to the composition of the alloy, the rich phase B alloy composition is designed ①Pr20 Nd61Dy10 Cu2 Al4Ga3

[0251] 2.2. For smelting, the method of ma...

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Abstract

The invention provides an application of a blended alloy in preparing a neodymium-iron-boron magnet by using a waste sintered magnet, and further provides a method for preparing the neodymium-iron-boron magnet by using the waste sintered magnet. The invention provides a blended alloy with specific composition, and the blended alloy is used in a process for preparing a neodymium-iron-boron magnet from a waste sintered magnet. According to the blended alloy with the specific composition, the components and performance of products can be flexibly blended to meet the design requirements, the consistency of batch products is ensured, the utilization rate of waste sintered magnets is increased, and the diffusion performance can be improved. According to the invention, the waste magnet can be directly crushed into the alloy without smelting, the alloy is mixed with the rare earth-rich alloy, the phase-rich defect of the waste magnetic steel is overcome, and the magnetic performance is greatly improved; smelting is not needed, the machining cost is reduced, meanwhile, limitation of the smelting addition amount can be avoided, and 100% utilization of waste magnetic steel raw materials is achieved.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and relates to the application of blended alloys in the preparation of NdFeB magnets by using waste sintered magnets, a NdFeB magnet prepared by using waste sintered magnets and its method, and especially relates to the use of blended alloys in the use of waste sintered magnets. Application in the preparation of NdFeB magnets, a NdFeB magnet prepared by using waste sintered magnets and a method for preparing NdFeB magnets by recycling the waste sintered magnets. Background technique [0002] As we all know, with Nd 2 Fe 14 The R-Fe-B rare earth sintered magnet with B-type compound as the main phase is a permanent magnet with the highest performance among all magnetic materials. It is widely used in hard disk drive voice coil motors (VCM), servo motors, and inverter air conditioner motors. , Electric motors for hybrid vehicles, etc. The traditional method of R-Fe-B rare earth sintere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266H01F41/0273
Inventor 陈运鹏毛琮尧毛华云易鹏鹏赖欣徐志欣
Owner JIANGXI JLMAG RARE EARTH