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Method for recycling nickel-plated sintered NdFeB waste

A technology of neodymium iron boron and nickel plating, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of power consumption, unqualified coating, time-consuming, etc., save energy consumption and working hours, and facilitate production arrangements , The effect of simple process

Active Publication Date: 2013-12-04
宁波科田磁业股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) Reuse of nickel-plated waste requires roasting NdFeB nickel-plated waste in a sintering furnace under nitrogen protection, which is time-consuming and power-consuming; (2) Nickel-plated NdFeB after roasting The waste needs to be put into the vacuum melting furnace to be smelted again, and then hydrogen shredded for use, which is time-consuming and power-consuming
However, this method has problems such as substrate corrosion and environmental pollution, and it is suitable for products with unqualified coatings, and is not suitable for the reuse of scrapped products caused by nickel-plated finished products due to missing corners and unqualified magnetic properties.

Method used

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  • Method for recycling nickel-plated sintered NdFeB waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Use a jaw crusher to roughly crush the collected nickel-plated sintered NdFeB waste into particles below 25mm, and then use a secondary crusher to crush the material into powder with a particle size below 3mm. peeling off;

[0017] The powder is then sieved through a 30-60 mesh sieve in a sealed nitrogen glove box to remove most of the nickel plating flakes;

[0018] Add 2wt% praseodymium neodymium hydride to the sieved powder, stir for 1-3 hours to make the ingredients uniform, then use a jet mill to prepare the powder into a fine powder of 3-5 μm, and stir again for 1-3 hours, every Add 1wt‰—5wt‰ milling additive before the first stirring;

[0019] After the powder is fully stirred and mixed, take an appropriate amount of powder for compression molding and sintering to make 5-20 NdFeB magnet samples for performance testing. The test data is: Br: 12.8—13.2KGS, Hcb: 11.8-12.5 KOe, Hcj: 14.2-15.3KOe, (BH) max: 40.5-43.0MGOe, according to GB / T 13560-2000, its performanc...

Embodiment 2

[0021] Use a jaw crusher to roughly crush the collected nickel-plated sintered NdFeB waste into particles below 25mm, and then use a secondary crusher to crush the material into powder with a particle size below 3mm. peeling off;

[0022] The powder is then sieved through a 30-60 mesh sieve in a sealed nitrogen glove box to remove most of the nickel plating flakes;

[0023] Add 2wt% iron gadolinium hydride to the sieved powder, stir for 1-3 hours to make the ingredients uniform, then use a jet mill to prepare the powder into a fine powder of 3-5 μm, and stir again for 1-3 hours, every Add 1wt‰—5wt‰ milling additive before the first stirring;

[0024] After the powder is fully stirred and mixed, take an appropriate amount of powder for compression molding and sintering to make 5-20 pieces of 52×52×27 NdFeB magnet samples for performance testing. The test data is: Br: 12.2—12.6KGS , Hcb: 11.5-12.2KOe, Hcj: 13.4-14.7KOe, (BH) max: 36.7—38.4MGOe, according to GB / T 13560-2000, it...

Embodiment 3

[0026] Use a jaw crusher to roughly crush the collected nickel-plated sintered NdFeB waste into particles below 25mm, and then use a secondary crusher to crush the material into powder with a particle size below 3mm. peeling off;

[0027] The powder is then sieved through a 30-60 mesh sieve in a sealed nitrogen glove box to remove most of the nickel plating flakes;

[0028] Add 3wt% praseodymium neodymium hydride to the sieved powder, stir for 1-3 hours to make the ingredients uniform, then use the jet mill to prepare the powder into a fine powder of 3-5 μm, and stir again for 1-3 hours, every Add 1wt‰—5wt‰ milling additive before the first stirring;

[0029] After the powder is fully stirred and mixed, take an appropriate amount of powder for compression molding and sintering to make 5-20 pieces of 52×52×27 NdFeB magnet samples for performance testing. The test data is: Br: 12.6—12.9KGS , Hcb: 11.5-12.2KOe, Hcj: 14.8-16.1KOe, (BH) max: 38.8—41.3MGOe, according to GB / T 13560...

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Abstract

The invention provides a method for recycling nickel-plated sintered NdFeB waste. The method includes the steps that a material is smashed into powder with the grain size below 3mm, the powder is sieved in a sealed nitrogen tank to remove most of flaky things of a nickel-plated layer, rare earth hydride is added in the sieved powder, the mixture is stirred evenly, the powder is made into 3-5-micrometer fine powder through a jet mill, the appropriate powder is taken to be formed in a compression mode, a sample is sintered to perform performance test, 0-60% by weight of powder of a related trade mark is added according to sample testing results and product performance requirements, the mixture is stirred evenly, and the qualified powder is formed in a compression mode and sintered into NdFeB magnets. For recycling of the nickel-plated sintered NdFeB waste, nickel-plated sintered NdFeB waste does not need to be roasted or remelted, sieving is performed after the smashing process, the rare earth hydride is added for powder manufacturing, the sample is trial-manufactured firstly to test the performance of the powder, a certain amount of powder of the related trade mark is added according to the performance requirements of products to be manufactured, and various sintered NdFeB products meeting the different performance requirements can be manufactured. The technological process is simple, the utilization rate of the NdFeB material and the utilization rate of the rear earth material are improved, and energy conservation and environment protection are also facilitated.

Description

technical field [0001] The invention relates to a method for reusing NdFeB waste materials, in particular to a method for reusing nickel-plated sintered NdFeB waste materials. Background technique [0002] The surface of sintered NdFeB products usually needs surface treatment methods such as electroplating and painting to improve its corrosion resistance. Nickel plating is a more commonly used surface treatment method. How to effectively utilize nickel-plated sintered NdFeB waste is a difficult problem. CN103117143A announced a NdFeB magnet sintered with NdFeB nickel-plated waste, which is prepared through a sintering process from a mixture of NdFeB nickel-plated waste and rare earth-rich preparations. The preparation method is: Roasting NdFeB nickel-plating waste; preparing NdFeB nickel-plating waste powder; preparing mixture; pressing and molding; sintering. This method has the following disadvantages: (1) Reuse of nickel-plated waste requires roasting NdFeB nickel-plat...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08
Inventor 邓晓飞王育平赵惠芬
Owner 宁波科田磁业股份有限公司
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