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Recycling process of sintering neodymium iron boron discard black wafer

A neodymium iron boron and black flake technology, applied in recycling technology, magnetic materials, electrical components, etc., can solve the problems of limited practical value, increased remelting, complicated surface pretreatment of waste, etc., achieving high recycling rate and saving Manufacturing cost, environment-friendly effect

Inactive Publication Date: 2015-07-29
安徽万磁电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface pretreatment of waste materials involved in this method is relatively complicated, and the process of remelting and homogenization needs to be added after pretreatment, so the practical value is limited

Method used

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Embodiment Construction

[0016] Below in conjunction with embodiment the present invention is further described.

[0017] A process for reusing sintered NdFeB scrap black chips, comprising the following steps:

[0018] (i) Put the black chip waste produced in the machining process in an ultrasonic cleaning tank, and use a degreaser to clean and remove dust, oil, etc. in the waste. During the cleaning process, perform drainage and water washing for many times until the surface of the waste is free of stickiness. After attaching, put it into an oven with a temperature of 200°C and bake for 2 hours until it is completely dried;

[0019] (ii) Use a jaw crusher to roughly crush the sintered NdFeB black flake waste into particles with a particle size of 30mm, and then pass the coarsely crushed particles through a secondary crusher to further crush them into particles below 3mm;

[0020] (iii) Pass the sintered NdFeB waste particles obtained in (ii) through the hydrogen crushing process, and perform hydroge...

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Abstract

The invention discloses a recycling process of a sintering neodymium iron boron discard black wafer. The recycling process comprises the following steps of pretreatment of waste material, multi-stage crushing, hydrogen decrepition, powder preparation by jet milling, blending of main alloy and auxiliary alloy, forming of a magnetic field, and sintering, so as to prepare a neodymium iron boron magnet which has satisfactory requirement; the auxiliary alloy is an alloy fine powder containing one or multiple of praseodymium neodymium, holmium iron, gadolinium iron and dysprosium iron, and the percentage of auxiliary alloy is 1% to 50%. The recycling process has the advantages that the utilizing rate of waste material of the black wafer is high, the flow process is simple and controllable, the operability is strong, and the manufacturing cost is saved; strong acid and strong alkaline with higher pollution property are not contained, the environment-friendly effect is realized, and the economic and social benefits are higher.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a recycling process of sintered NdFeB scrap black chips. Background technique [0002] NdFeB rare earth iron-based permanent magnet materials are widely used in various fields of modern science and technology because of their good comprehensive magnetic properties. The continuous expansion of the application field has put forward higher requirements for the shape and specification of the magnet. These high requirements on shapes and specifications increase the difficulty of the machining process, increase the processing loss rate, and produce a large number of scraps and substandard products. [0003] The sintered blank generally has to go through multiple machining processes such as centerless grinding, hole processing, slicing, and chamfering to obtain a blank to be plated with a shape and specification that meets the requirements. The waste produced in the machining process...

Claims

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Application Information

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IPC IPC(8): B22F8/00H01F1/057H01F1/08
CPCY02W30/50
Inventor 张亚波何进张书来史世文
Owner 安徽万磁电子有限公司
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