Method for removing organic matters in waste MQ bonded neodymium-iron-boron magnetic powder by using sodium hypochlorite chemical reaction method

A sodium hypochlorite, chemical reaction technology, applied in the direction of solid waste removal, etc., can solve the problems of unsatisfactory removal effect, complicated process and long processing time.

Active Publication Date: 2021-09-07
BEIJING UNIV OF TECH
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the process is complex and the processing time is long, and the purely physical process for similar and compatible removal is not ideal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for removing organic matters in waste MQ bonded neodymium-iron-boron magnetic powder by using sodium hypochlorite chemical reaction method
  • Method for removing organic matters in waste MQ bonded neodymium-iron-boron magnetic powder by using sodium hypochlorite chemical reaction method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] The mixed solvent formula of a kind of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment to remove carbon and oxygen is: by volume 40% sodium hypochlorite, 60% distilled water.

[0017] The method for removing carbon and oxygen of a kind of waste and old MQ bonded NdFeB magnetic powder involved in the present invention is carried out according to the following steps:

[0018] 1. Remove the solidified organic matter in the waste MQ bonded NdFeB magnetic powder: Put the waste MQ bonded NdFeB magnetic powder and the mixed solvent into the three-necked flask according to the mass ratio of 1:6, keep the pressure of the three-necked flask at normal pressure, and use poly Stir at a constant speed with a tetrafluoroethylene stirring paddle, and control the temperature at 30°C through a water bath, keep it warm for 1 hour, and take it out after the end to obtain the magnetic powder A;

[0019] 2. Remove the decomposition products of cured epoxy resin: ...

example 2

[0028] The mixed solvent formula of a kind of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment to remove carbon and oxygen is: sodium hypochlorite 60% by volume, distilled water 40%.

[0029] The method for removing carbon and oxygen of a kind of waste and old MQ bonded NdFeB magnetic powder involved in the present invention is carried out according to the following steps:

[0030] 1. Remove the solidified organic matter in the waste MQ bonded NdFeB magnetic powder: put the waste MQ bonded NdFeB magnetic powder and the mixed solvent into a three-necked flask at a mass ratio of 1:7, keep the pressure of the three-necked flask at normal pressure, and use poly Stir at a constant speed with a tetrafluoroethylene stirring paddle, and control the temperature at 15°C through a water bath, keep it warm for 2.5 hours, and take it out after the end to obtain the magnetic powder A;

[0031] 2. Remove the decomposition products of cured epoxy resin: Pour the ma...

example 3

[0039] A kind of mixed solvent formula for removing carbon and oxygen in a kind of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment is: sodium hypochlorite 50% by volume, distilled water 50%.

[0040] The method for removing carbon and oxygen of a kind of waste and old MQ bonded NdFeB magnetic powder involved in the present invention is carried out according to the following steps:

[0041] 1. Remove the solidified organic matter in the waste MQ bonded NdFeB magnetic powder: Put the waste MQ bonded NdFeB magnetic powder and the mixed solvent into a three-necked flask at a mass ratio of 1:8, keep the pressure of the three-necked flask at normal pressure, and use poly Stir at a constant speed with a tetrafluoroethylene stirring paddle, and control the temperature at 0°C through a water bath, keep it warm for 2 hours, and take it out after the end to obtain the magnetic powder A;

[0042] 2. Remove the decomposition products of cured epoxy resin: Pour ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for removing organic matters in waste MQ bonded neodymium-iron-boron magnetic powder by using a sodium hypochlorite chemical reaction method, and belongs to the field of material recovery. According to the method for removing the organic matters in the waste MQ bonded neodymium-iron-boron magnetic powder by using the sodium hypochlorite chemical reaction method, sodium hypochlorite can react with cyano functional groups in cured epoxy resin to enable the epoxy resin to fall off from the waste MQ bonded neodymium-iron-boron magnetic powder, and then distilled water is used for dissolving a product, so that thorough proceeding of the reaction can be accelerated or promoted; and the remaining unreacted cured epoxy resin can also be partially dissolved in absolute ethyl alcohol. And the decomposition of the sodium hypochlorite can be greatly reduced through water bath cooling, so that the reaction rate of cyano decomposition reaction is increased, and removal of the cured epoxy resin is facilitated. And moreover, the oxidative damage of hypochlorite to the MQ neodymium-iron-boron magnetic powder is relieved due to the relatively low reaction temperature, so that the neodymium-iron-boron magnetic powder is protected while the removal of the cured epoxy resin is facilitated. Meanwhile, oxides in the waste magnetic powder are removed through dilute acetic acid, so that the regenerated neodymium-iron-boron magnetic powder with the lower carbon and oxygen content can be obtained without damaging the neodymium-iron-boron magnetic powder.

Description

technical field [0001] This patent invents a method for removing organic matter in waste MQ bonded NdFeB magnetic powder by chemical reaction method, which belongs to the technical field of material recovery. Background technique [0002] NdFeB is the third-generation rare earth permanent magnet material, which is widely used in electric vehicles, smart devices, medical equipment, wind power generation, etc. due to its excellent magnetic properties. Among the NdFeB products, the output of sintered NdFeB accounts for more than 90%, but the output of bonded NdFeB is also increasing year by year at a relatively high rate. Sintered NdFeB magnets have better performance, but the production process is more complicated and the cost is higher. Although the magnetic properties of bonded NdFeB magnets are reduced due to the addition of binders, they have the advantages of easy mass production, precise manufacturing dimensions, complex shapes, low density, and stable magnetic properti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 岳明朱佩鸿刘敏高可刘卫强路清梅
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap