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Method for recycling neodymium iron boron magnetic material

A technology for recycling NdFeB and NdFeB, applied in the direction of magnetic materials, magnetic objects, and process efficiency improvement, can solve the problems of difficult powder, recycling, etc., and achieve the effect of improving the recycling rate of ingots

Active Publication Date: 2014-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for recycling NdFeB waste in order to overcome the defect that it is difficult to recycle the powder by using the existing method

Method used

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  • Method for recycling neodymium iron boron magnetic material
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  • Method for recycling neodymium iron boron magnetic material

Examples

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Embodiment 1

[0024] This embodiment is used to illustrate the method for recycling NdFeB waste provided by the present invention.

[0025] (1) Preprocessing:

[0026] Will the volume be 30-8000mm 3 The bulk waste is removed by a shot blasting machine to remove surface oxides, and the obtained product is called A 1 ; Set the volume to 0.05-3mm 3 The powder is treated at 300°C for 3 hours to remove oil at a vacuum degree of about 5 Pa, and the obtained product is called A 2 .

[0027] (2) Smelting slagging:

[0028] Will A 1 、A 2 Mix material A according to the weight ratio of 9:1, mix 10kg material A, 0.22kg Ca-Al alloy (Ca content in Ca-Al alloy is 80%), and 0.492kg CaCl 2 mixing, and placing the obtained mixture in a vacuum melting furnace, melting and slagging at 1300° C. for 20 minutes under the protection of argon, and casting to obtain a NdFeB alloy ingot.

[0029] The main element composition, content and ingot yield of NdFeB alloy ingot are shown in Table 1:

[0030] Table ...

Embodiment 2

[0034] This embodiment is used to illustrate the method for recycling NdFeB waste provided by the present invention.

[0035] (1) Preprocessing:

[0036] Will the volume be 50-8000mm 3 The bulk waste is removed by a shot blasting machine to remove surface oxides, and the obtained product is called A 1 ; set the volume to 0.5-3mm 3 The powder is treated at 300°C for 3 hours to remove oil at a vacuum degree of about 5 Pa, and the obtained product is called A 2 .

[0037] (2) Smelting slagging:

[0038] Will A 1 、A 2 Mix material A according to the weight ratio of 7:3, mix 10kg material A, 0.53kg Ca-Al alloy (Ca content in Ca-Al alloy is 80%), and 1.48kg CaCl 2 mixing, and placing the obtained mixture in a vacuum melting furnace, melting and slagging at 1400° C. for 40 minutes under the protection of argon, and casting to obtain a NdFeB alloy ingot.

[0039] The main element composition, content and ingot yield of NdFeB alloy ingots are shown in Table 2:

[0040] Table 2...

Embodiment 3

[0043] This embodiment is used to illustrate the method for recycling NdFeB waste provided by the present invention.

[0044] (1) Preprocessing:

[0045] Will the volume be 30-8000mm 3 The bulk waste is removed by a shot blasting machine to remove surface oxides, and the obtained product is called A 1 ; set the volume to 0.5-3mm 3 The powder is treated at 300°C for 3 hours to remove oil at a vacuum degree of about 5 Pa, and the obtained product is called A 2 .

[0046] (2) Smelting slagging:

[0047] Will A 1 、A 2 Mix material A according to the weight ratio of 8:2, mix 10kg material A, 0.44kg Ca-Al alloy (Ca content in Ca-Al alloy is 80%), and 0.98kg CaCl 2 mixing, and placing the obtained mixture in a vacuum melting furnace, melting and slagging at 1350° C. for 30 minutes under the protection of argon, and casting to obtain an NdFeB alloy ingot.

[0048] The main element composition, content and ingot yield of NdFeB alloy ingots are shown in Table 3:

[0049] table ...

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Abstract

The invention discloses a method for recycling a neodymium iron boron waste material. The method comprises the following steps: mixing the neodymium iron boron waste material with a reducing agent and a cosolvent and subsequently smelting to make slag, wherein the neodymium iron boron waste material contains a blocky waste material and a powder material, the volume of the blocky waste material is greater than or equal to 27mm<3>, the volume of the powder material is smaller than or equal to 3mm<3>, based on the total weight of the neodymium iron boron waste material, the content of the blocky waste material accounts for 50-95%, and the content of the powder material accounts for 5-50%. By adopting the method, not only is the content of oxygen in a recycled neodymium iron boron alloy ingot remarkably reduced, but also the ingot yield is increased, and thus the neodymium iron boron waste material can be effectively recycled.

Description

technical field [0001] The invention relates to a method for recycling NdFeB magnetic materials. Background technique [0002] NdFeB permanent magnet materials are widely used in many fields such as automobiles, computers, electronics, machinery, energy, and medical equipment due to their excellent magnetic properties. However, due to the complexity of the NdFeB production process and the yield rate, 20%-30% of unqualified lumpy waste and very severely oxidized powder will be generated during the production process. Wherein, the massive waste mainly includes NdFeB cutting waste, NdFeB sintered rough, NdFeB scraps and NdFeB substandard products. The powder mainly includes NdFeB jet mill powder and NdFeB cutting mud. The NdFeB waste contains a large amount of rare earth metals. Among them, the main component of bulk waste is Re 2 Fe 14 B, wherein Re is neodymium, or neodymium and at least one other rare earth metal. The main component of the powder is Re 2 Fe 14 B and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22B7/00C22B58/00H01F1/057
CPCY02P10/20
Inventor 陈波张法亮邓小霞
Owner BYD CO LTD