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Treatment method of rare earth permanent magnet waste

A rare earth permanent magnet and processing method technology, applied in the direction of improving process efficiency, can solve the problems of high cost and high energy consumption, and achieve the effects of reduced dosage, high yield and environmental friendliness

Inactive Publication Date: 2021-05-28
连云港高品再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent No. 201610523619x, titled a treatment method for rare earth permanent magnet waste, the patent discloses a treatment method for rare earth permanent magnet waste, in which demagnetization and degreasing use high-temperature heating, and hydrogen crushing uses 5-20 mesh Sieve, this treatment method consumes a lot of energy and costs high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, a kind of processing method of rare earth permanent magnet waste of the present invention comprises the following steps,

[0024] In the spray granulation tower, liquid nitrogen is used to freeze the rare earth permanent magnet waste at a temperature of -100°C, and then add the frozen block to the chamfering machine, the addition amount is 1 / 3 of the volume of the chamfering machine, and then Grinding, the grinding time is 60 minutes, until there is no rust on the surface of the waste; use a vibrating screen with a 200-mesh screen to screen the waste, collect the waste larger than the screen aperture, and directly recycle the waste smaller than the screen aperture for other processes Raw material processing; use a vibrating screen equipped with a 200-mesh screen to screen the wood chips, and collect wood chips smaller than the aperture of the screen; mix the collected waste with the wet wood chips in a ratio of 1:2, add to the pour Grind in an angle machin...

Embodiment 2

[0025] Embodiment 2, the processing method of a kind of rare earth permanent magnet waste of the present invention, comprises the following steps,

[0026] In the spray granulation tower, liquid nitrogen is used to freeze the rare earth permanent magnet waste at a temperature of -80°C, and then the frozen block is added to the chamfering machine in an amount of 1 / 2 of the volume of the chamfering machine, and then Grinding, the grinding time is 80 minutes, until there is no rust on the surface of the waste; use a vibrating screen with a 180-mesh screen to screen the waste, collect the waste larger than the screen aperture, and directly recycle the waste smaller than the screen aperture for other processes Raw material processing; use a vibrating screen equipped with a 180-mesh screen to screen the wood chips, and collect wood chips smaller than the aperture of the screen; mix the collected waste with the wet wood chips in a ratio of 1:2, add to the pouring Grind in an angle ma...

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PUM

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Abstract

The invention provides a treatment method of rare earth permanent magnet waste. The treatment method comprises the following steps; 1, carrying out liquid nitrogen freezing demagnetization and deoiling; 2, carrying out dry grinding and derusting; 3, screening the waste; 4, decontaminating; 5, performing sieving; 6, performing hydrogen decrepitation; and roasting, extracting and purifying to obtain a rare earth chloride solution. Therefore, the rare earth permanent magnet waste is treated, and the treatment method is simple, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the field of rare earth production, in particular to a treatment method for rare earth permanent magnet waste. Background technique [0002] Using rare earth permanent magnet waste to re-produce NdFeB permanent magnet materials is the best way to realize the recycling of rare earth resources. The production process of rare earth permanent magnet materials has high requirements on raw materials, and a large number of impurities contained in rare earth waste will seriously affect the quality and quality of products. At present, the existing waste treatment methods cannot effectively remove the impurities of the rare earth permanent magnet waste, resulting in a great impact on the reutilization rate and comprehensive magnetic properties of the rare earth permanent magnet waste, resulting in a waste of resources. Therefore, how to effectively treat the rare earth permanent magnet waste and remove the impurities is particularly cri...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B59/00
CPCC22B1/02C22B7/005C22B7/006C22B59/00Y02P10/20
Inventor 张宇
Owner 连云港高品再生资源有限公司