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Method for recycling waste and old nickel-plated rare-earth-iron-boron series permanent magnet material

A permanent magnet material and rare earth technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of high cost, environmental pollution, complex deplating process conditions, etc., and achieve the effect of low cost and simple process

Active Publication Date: 2012-05-16
NINGBO KONIT IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional recycling method of nickel-plated rare earth permanent magnet materials adopts the deplating process, but the deplating process has defects such as complex process conditions, high cost, and easy environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, the surface treatment of the waste nickel-plated rare earth-iron-boron permanent magnet material is carried out by manual sorting and erasing to remove impurities on the surface of the waste nickel-plated rare earth-iron-boron permanent magnet material. Then, using a hammer-type mechanical crushing device to mechanically crush the surface-treated waste nickel-plated rare earth-iron-boron permanent magnet material to obtain mixed particles with a particle size of 1-50 mm. Subsequently, the obtained particles were subjected to hydrogen absorption treatment in an oxygen-free environment with a vacuum pressure of 0.1Pa, filled with hydrogen gas, and kept at a pressure of 0.1MP. The mixed particles of rare earth-iron-boron permanent magnet materials absorbed hydrogen gas, and the lattice expanded. The grains are broken, the dehydrogenation temperature is 600°C, and the dehydrogenation time is 4 hours to obtain a mixed powder of nickel layer and rare earth-iron-boron pe...

Embodiment 2

[0032]First, the surface treatment of the waste nickel-plated rare earth-iron-boron permanent magnet material is carried out by manual sorting and erasing to remove impurities on the surface of the waste nickel-plated rare earth-iron-boron permanent magnet material. Then, using a hammer-type mechanical crushing device to mechanically crush the surface-treated waste nickel-plated rare earth-iron-boron permanent magnet material to obtain mixed particles with a particle size of 1-50 mm. Subsequently, the obtained particles were subjected to hydrogen absorption treatment in an oxygen-free environment with a vacuum pressure of 0.1Pa, filled with hydrogen gas, and kept at a pressure of 0.1MP. The mixed particles of rare earth-iron-boron permanent magnet materials absorbed hydrogen gas, and the lattice expanded. The grains are broken, the dehydrogenation temperature is 300°C, and the dehydrogenation time is 4 hours to obtain a mixed powder of nickel layer and rare earth-iron-boron per...

Embodiment 3

[0037] First, the surface treatment of the waste nickel-plated rare earth-iron-boron permanent magnet material is carried out by manual sorting and erasing to remove impurities on the surface of the waste nickel-plated rare earth-iron-boron permanent magnet material. Then, using a hammer-type mechanical crushing device to mechanically crush the surface-treated waste nickel-plated rare earth-iron-boron permanent magnet material to obtain mixed particles with a particle size of 1-50 mm. Subsequently, the obtained particles were subjected to hydrogen absorption treatment in an oxygen-free environment with a vacuum pressure of 0.1Pa, filled with hydrogen gas, and kept at a pressure of 0.1MP. The mixed particles of rare earth-iron-boron permanent magnet materials absorbed hydrogen gas, and the lattice expanded. The grains are broken, the dehydrogenation temperature is 500°C, and the dehydrogenation time is 4 hours to obtain a mixed powder of nickel layer and rare earth-iron-boron pe...

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PUM

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Abstract

The invention provides a method for recycling a waste and old nickel-plated rare-earth-iron-boron series permanent magnet material. The method comprises the following steps of: (1) treating the surface of the waste and old nickel-plated rare-earth-iron-boron series permanent magnet material; (2) mechanically crushing the surface-treated waste and old nickel-plated rare-earth-iron-boron series permanent magnet material to obtain mixed particles with 1-50 mm particle size; (3) performing hydrogen absorption treatment on the particles in anaerobic environment to obtain a nickel layer and rare-earth-iron-boron series permanent magnet material powder with 0.01-5 mm particle size, and recovering the nickel layer through screen separation; (4) adding an auxiliary material into the rare-earth-iron-boron series permanent magnet material powder, and performing ball milling or jet milling after uniform mixing to obtain mixed powder with 0.1-100 mum particle size; and (5) performing oriented formation, sintering and tempering heat treatment on the obtained mixed powder. The method provided by the invention has the advantages of simple process, low cost and no environmental pollution.

Description

technical field [0001] The invention relates to a method for recycling waste nickel-plated rare earth-iron-boron permanent magnet materials. In particular, the present invention relates to a method for preparing new rare earth permanent magnet materials by using waste nickel-plated rare earth-iron-boron permanent magnet materials. Background technique [0002] With the development of international industrialization, the use of functional materials is becoming more and more extensive, and the field of magnetic materials is developing rapidly. The proven reserves of rare earth mines in my country account for 80% of the world, which makes the field of rare earth permanent magnet materials in my country develop rapidly. However, due to the characteristics of the rare earth permanent magnet material products and processing factors, the rare earth permanent magnet material products are prone to defects such as missing corners, pores, cracks, and knife wires during the production ...

Claims

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Application Information

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IPC IPC(8): C22B7/00H01F1/057H01F1/08H01F41/00
CPCY02P10/20
Inventor 陈超辜程宏
Owner NINGBO KONIT IND
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