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Sintered neodymium iron boron waste remoulding method

A NdFeB and reshaping technology, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of high cost, many processes, time-consuming and labor-intensive, etc.

Active Publication Date: 2014-02-26
NINGBO KETIAN MAGNET CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can reuse the powder, there are still many processes, time-consuming and labor-intensive, and the cost is still high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention will be further described below in conjunction with embodiment.

[0017] The blocky waste scrapped in the NdFeB magnet molding process is manually crushed, and the waste is crushed into a coarse powder of less than 40 meshes with a rubber hammer. Put the coarse powder into the jet mill to make powder, the speed of the jet mill is set at 800-1000 rpm, the jet mill is protected by nitrogen, the oxygen content is controlled to be ≤2PPm, and the powder output speed is controlled at 2-4 kg / min. Put the jet-milled powder into a bucket protected by nitrogen, and add gasoline and anti-oxidation protection agent in the ratio of 1-2ml gasoline and 0.2-1ml protective agent per kilogram of powder, The oxidation protection agent includes polyethylene oxide allyl ether or polyethylene oxide allyl glycidyl ether, and then the bucket protected with nitrogen is placed on the mixer for stirring. Stir and mix the powder at a rate of 200-300kg / hour. After the mixed p...

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PUM

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Abstract

The invention discloses a sintered neodymium iron boron waste remoulding method. The sintered neodymium iron boron waste remoulding method comprises the steps of: a), crushing neodymium iron boron bulky waste into powder smaller than 40 meshes, putting the powder into a jet mill, and pulverizing, wherein the rotation speed of the jet mill speed is set at 800-1000rpm, the interior of the jet mill is protected by nitrogen gas, and the oxygen content is controlled at 2ppm; b), filling the powder finely ground by the jet mill into a material barrel protected by the nitrogen gas, adding 1-2ml of gasoline and 0.2-1ml of an oxidation preventer into each kilogram of the powder, and putting the material barrel into a mixer for stirring and mixing; and c) moulding the mixed powder, and sintering into a neodymium iron boron magnet. The neodymium iron boron magnet prepared by the method has normal cross-section crystallization; abnormal coarse-grained phenomenon does not appear; the performance of the neodymium iron boron magnet is consistent with that before the neodymium iron boron magnet is processed; and a normal material flow can be adopted. The sintered neodymium iron boron waste remoulding method is easy and convenient to operate and convenient and direct to process; and by the sintered neodymium iron boron waste remoulding method, waste of resources can be reduced and cost can be saved.

Description

technical field [0001] The invention relates to a method for reshaping NdFeB waste materials. Background technique [0002] In the sintered NdFeB molding process, scraps will appear due to cracking and other reasons during the first mold pressing test and large-scale product molding and pressing, and these wastes are generally collected regularly. Since these massive waste materials have not been processed by isostatic pressing and sintering, their density is low. These massive waste materials are crushed into 40-mesh coarse powder, and then molded, pressed, and sintered to make NdFeB magnets. Due to the long storage time of waste materials, there will be obvious agglomeration of powder particles. After sintering the products pressed and formed by using these waste powders, abnormal grains will appear on the cross-section of the magnet, which will affect the quality of the electroplated coating of the magnet. [0003] At present, there is a method for recycling the waste: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C33/02C22C38/00
Inventor 徐峰王育平周子翔徐科勇
Owner NINGBO KETIAN MAGNET CO LTD
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