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A phase-rich alloy for recycling magnet waste and a method for recycling waste magnets

A magnet and alloy technology, applied in the field of magnet preparation, can solve the problems of affecting the yield rate, limited amount of addition, waste of elements, etc., and achieve the effect of improving the utilization rate

Active Publication Date: 2020-08-25
JIANGXI JLMAG RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, researchers and manufacturers have gradually tried to recycle waste magnets, usually in the following ways: After cleaning and other pre-treatments, a small amount of waste magnets can be added to sintered magnets as raw materials During the preparation process, new magnets with performances that meet the design requirements are manufactured based on the original process, but there are still many problems, such as a part of the smelting process will be burned and more slag will be formed to affect the yield, and the amount added is Very limited; there are also methods of electrolytic refining of spent magnets, but this method usually only extracts rare earths, other elements will be wasted

Method used

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  • A phase-rich alloy for recycling magnet waste and a method for recycling waste magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] 1. A alloy preparation

[0113] 1.1 Carry out pretreatment such as degreasing and cleaning of NdFeB waste.

[0114] 1.2 Carry out initial crushing on bulk raw materials, and the particle size after crushing is <30mm. The present invention has no special restrictions on the crushing equipment and conditions.

[0115] 1.3 Hydrogen crushing (HD) processing alloy flake production process, hydrogen absorption time is 75min, dehydrogenation at 580 ℃ for 5h, and finally water cooling for 2h to obtain coarse powder (A alloy).

[0116]The composition analysis of the alloy A prepared by the present invention is carried out. For details, see Table 1. Table 1 shows the composition of the scrap alloy A provided in Example 1 of the present invention.

[0117] Table 1

[0118] effective element Nd Pr Dy Ho B Zr Cu co Al Ga Fe Element content 23.1 6.3 0.6 0.9 0.92 0.10 0.10 0.9 0.40 0.07 margin

[0119] 2. Preparation of Alloy B

[01...

Embodiment 2

[0133] 1. A alloy preparation

[0134] 1.1 Carry out pretreatment such as degreasing and cleaning of NdFeB waste.

[0135] 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 the actual production situation.

[0136] 1.3 Hydrogen crushing (HD) processing alloy flake production process, hydrogen absorption time is 75min, dehydrogenation at 580 ℃ for 5h, and finally water cooling for 2h to obtain coarse powder (A alloy).

[0137] Composition analysis was carried out on the A alloy prepared in Example 2 of the present invention, and the specific composition was the same as that of the scrap A alloy in Example 1.

[0138] 2. Preparation of Alloy B

[0139] 2.1. According to the composition of the alloy, the rich phase alloy composition is designed ①Pr16 Nd55 Dy20 Cu2 A...

Embodiment 3

[0150] 1. A alloy preparation

[0151] 1.1 Carry out pretreatment such as degreasing and cleaning of NdFeB waste.

[0152] 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 the actual production situation.

[0153] 1.3 Hydrogen crushing (HD) processing alloy flake production process, hydrogen absorption time is 75min, dehydrogenation at 580 ℃ for 5h, and finally water cooling for 2h to obtain coarse powder (A alloy).

[0154] Composition analysis was carried out on the A alloy prepared in Example 3 of the present invention, and the specific composition was the same as that of the scrap A alloy in Example 1.

[0155] 2. Preparation of Alloy B

[0156] 2.1. According to the composition of the alloy, the rich phase alloy composition is designed ①Pr16 Nd55 Dy10 Tb10 ...

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Abstract

The invention provides a rich-phase alloy for magnet waste cyclic utilization. The general formula of the rich-phase alloy is REx-My-Hz I, wherein 0.8<=x<=0.97, 0.02<=y<=0.2, 0.005<=z<=0.02, and x+y+z=1. RE is selected from one or more of La, Ce, Ho, Gd, Pr, Nd, Ho, Dy and Tb. M is selected from one or more of Al, Cu, Zn, Sn, Ga, Ge, Nb, V, W, Ti, Ni, Zr, Ta, Mn, Cd and Mo. H is hydrogen. The scheme that the rich-phase alloy is applied to waste rare earth treatment is provided, through combination of rare earth, metal elements and the hydrogen element at a specific ratio, the alloy is obtained, magnet wastes of different designations can be comprehensively utilized, and a magnet finished product of a specific designation or a new designation can be produced by adjusting the ratio.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and relates to a phase-rich alloy used for recycling magnet waste and a method for preparing magnets, in particular to a phase-rich alloy used for recycling NdFeB magnet waste and waste sintered NdFeB magnets A method of recycling magnets. Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. So far, it has developed to the third generation of NdFeB permanent magnet materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00H01F1/057H01F41/02
CPCC22C28/00H01F1/0577H01F41/0266
Inventor 陈运鹏毛华云赖欣
Owner JIANGXI JLMAG RARE EARTH