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
8 Cites 15 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The surface pretreatment of waste materials involved in this method is relatively complicated, and the proc...
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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.

Application Domain

Inorganic material magnetismRecycling and recovery technologies

Technology Topic

Strong acidsWaste material +15

Examples

  • Experimental program(1)

Example Embodiment

[0016] The present invention will be further described below in conjunction with the examples.
[0017] A recycling process for sintered NdFeB scrap black sheets, comprising the following steps:
[0018] (i) Place the black flake waste produced in the machining process in an ultrasonic cleaning tank, and use a degreaser to remove dust, oil, etc. in the waste. During the cleaning process, perform multiple drainage and water washing treatments until the surface of the waste is free of stickiness. After attaching, put it into an oven with a temperature of 200 ° C for 2 hours until it is completely dried;
[0019] (ii) Roughly crush the sintered NdFeB black flake waste into particles with a particle size of 30mm by using a jaw crusher, and further crush the roughly crushed particles into particles below 3mm by a medium crusher;
[0020] (iii) The sintered NdFeB waste particles obtained in (ii) are subjected to hydrogen absorption/dehydrogenation treatment through the hydrogen crushing process to obtain particles with a particle size of less than 1 mm. The saturated hydrogen absorption process is adopted, and the heating and dehydrogenation temperature is 545 ° C. ;
[0021] (iv) The small particles obtained after the hydrogen crushing are passed through the jet milling process to make fine powder with a particle size of 4 μm;
[0022] (v) Mixing the pre-prepared auxiliary alloy (including one or more alloy fine powders of praseodymium neodymium, holmium iron, gadolinium iron, and dysprosium iron) with the fine powder prepared in (iv) in a certain proportion, The proportion of the auxiliary alloy is 10-50%, and the stirring and mixing time is 1-3 hours to make the required performance grade.
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PUM

PropertyMeasurementUnit
Particle size20.0 ~ 30.0mm
Granularity3.0 ~ 5.0µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Improve recycling rates
  • The process is simple and controllable
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