Method for removing organic matter in waste mq bonded NdFeB magnetic powder by using sodium hydroxide chemical reaction method

A technology of sodium hydroxide and chemical reaction, applied to the removal of solid waste, etc., can solve problems such as incomplete methods

Active Publication Date: 2022-04-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of using the ammonium root in ammonia water to decompose the organic matter in bonded NdFeB is not thorough.

Method used

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  • Method for removing organic matter in waste mq bonded NdFeB magnetic powder by using sodium hydroxide chemical reaction method
  • Method for removing organic matter in waste mq bonded NdFeB magnetic powder by using sodium hydroxide chemical reaction method
  • Method for removing organic matter in waste mq bonded NdFeB magnetic powder by using sodium hydroxide chemical reaction method

Examples

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Effect test

example 1

[0016] A kind of mixed solvent formula for removing carbon and oxygen of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment is: by solid mass and liquid volume ratio sodium hydroxide / dehydrated alcohol 3g / 100ml.

[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 20°C through a water bath, keep it warm for 6 hours, and take it out after the end to obtain the magnetic powder A;

[0019] 2. Remove the decomposition pro...

example 2

[0027] A kind of mixed solvent formula for removing carbon and oxygen of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment is: by solid mass and liquid volume ratio sodium hydroxide / dehydrated alcohol 1g / 100ml.

[0028] 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:

[0029] 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 70°C through a water bath, keep it warm for 24 hours, and take it out after the end to obtain the magnetic powder A;

[0030] 2. Remove the decomposition products of cure...

example 3

[0038] A kind of mixed solvent formula for removing carbon and oxygen of waste and old MQ bonded NdFeB magnetic powder used in the present embodiment is: by solid mass and liquid volume ratio sodium hydroxide / dehydrated alcohol 1g / 100ml.

[0039] 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:

[0040] 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 1:6.5, 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 50°C through a water bath, keep it warm for 20 hours, and take it out after the end to obtain the magnetic powder A;

[0041] 2. Remove the decomposition ...

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Abstract

A method for removing organic matter in waste MQ bonded NdFeB magnetic powder by using a sodium hydroxide chemical reaction method belongs to the field of material recovery. The present invention first uses sodium hydroxide solution to undergo a multi-step hydrolysis reaction with the epoxy group in the cured epoxy resin to make it fall off from the waste MQ bonded NdFeB magnetic powder, and then utilizes the solubility of polyols to Similar absolute ethanol dissolves the product, which can accelerate or promote the reaction to proceed completely, and the remaining unreacted cured epoxy resin can also be partially dissolved in absolute ethanol. Moreover, the high temperature of the oil bath satisfies the catalytic reaction conditions, thereby greatly increasing the hydrolysis reaction rate, which is more conducive to the removal of the cured epoxy resin in the waste MQ bonded NdFeB magnetic powder. At the same time, medium-strength dilute acetic acid is used to remove the oxides in the waste magnetic powder, which can not destroy the NdFeB magnetic powder itself, but also dissolve the oxides on the surface of the magnetic powder, reduce the oxygen content in the regenerated magnetic powder, and obtain regeneration with lower carbon and oxygen content. NdFeB 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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/70
CPCB09B3/00B09B5/00
Inventor 岳明朱佩鸿刘敏高可刘卫强路清梅
Owner BEIJING UNIV OF TECH
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