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A kind of using NdFeB solid waste to prepare nd 2 fe 14 The method of b/α-fe nanocomposite magnetic powder

A technology of nd2fe14b and solid waste, which is applied in the fields of magnetism of inorganic materials, manufacture of inductors/transformers/magnets, electrical components, etc., can solve the problems of reducing the significance of recycling NdFeB waste, consuming acid and organic solvents, complicated and lengthy processes, etc. Achieve high regeneration value, good thermal stability and simple process

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the recovery process of NdFeB waste is mainly hydrometallurgy, such as sulfuric acid double salt precipitation, hydrochloric acid optimal solution method, sulfide impurity removal method, total extraction process, etc. The above-mentioned processes to obtain high-purity single rare earth oxides require complex and lengthy The process consumes a lot of acid and organic solvents, and causes a great waste of iron elements, which reduces the significance of recycling NdFeB waste

Method used

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  • A kind of using NdFeB solid waste to prepare nd <sub>2</sub> fe <sub>14</sub> The method of b/α-fe nanocomposite magnetic powder
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  • A kind of using NdFeB solid waste to prepare nd <sub>2</sub> fe <sub>14</sub> The method of b/α-fe nanocomposite magnetic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this example, NdFeB solid waste was used as raw material to prepare regenerated NdFeB by microwave-assisted chemical synthesis. 2 Fe 14 B / α-Fe nanocomposite magnetic powder, the specific preparation steps are as follows:

[0032] (1) Take 3g of NdFeB solid waste, place them in 30ml ethanol solution and deionized water in turn, ultrasonically clean them for 10min, repeat 3 times; put the cleaned samples in a drying oven at 80°C, and dry for 1h; after drying The samples were pulverized into a powder with a particle size of <400 μm using a jet mill.

[0033] (2) Place the powder in step (1) in a beaker and add 4mol / L of HNO 3 50ml of the solution was fully dissolved, and the insoluble matter was filtered off; 3g of reducing agent glycine was added to the obtained solution, and stirred to fully dissolve; then the obtained solution was put into a microwave reactor with a power of 800W and reacted for 10min to obtain nanocrystalline mixed oxidation things.

[0034] (3)...

Embodiment 2

[0037] In this example, a certain amount of rare earth elements and boron elements are added according to the type and content of NdFeB solid waste elements, and the regenerated Nd is prepared by microwave-assisted chemical synthesis. 2 Fe 14 B / α-Fe nanocomposite magnetic powder, the specific preparation steps are as follows:

[0038] (1) Take 3g of NdFeB solid waste, place them in 30ml ethanol solution and deionized water in turn, ultrasonically clean them for 10min, repeat 3 times; put the cleaned samples in a drying oven at 80°C, and dry for 1h; after drying The samples were pulverized into a powder with a particle size of <400 μm by jet mill, and the element types and contents of the powder waste were analyzed;

[0039] (2) with Nd 15 Fe 77 B 8 Add a certain amount of Nd(NO 3 ) 3 and H 3 BO 3 . Put the mixed powder in a beaker and add 4mol / L HNO 3 50ml of the solution was fully dissolved, and the insoluble matter was filtered off; 3g of reducing agent glycine was...

Embodiment 3

[0046] In this example, NdFeB solid waste is used as raw material, and the regenerated Nd with high coercive force is synthesized by microwave-assisted chemical synthesis. 2 Fe 14 B / α-Fe nanocomposite magnetic powder. Concrete preparation steps are as follows:

[0047] (1) Take 3g of NdFeB solid waste, place them in 30ml ethanol solution and deionized water in turn, ultrasonically clean them for 10min, repeat 3 times; put the cleaned samples in a drying oven at 80°C, and dry for 1h; after drying The samples were pulverized into a powder with a particle size of <400 μm by jet mill, and the element types and contents of the powder waste were analyzed;

[0048] (2) with Nd 15 Fe 77 B 8 Add a certain amount of Nd(NO 3 ) 3 and H 3 BO 3 . Put the mixed powder in a beaker and add 4mol / L HNO 3 50ml of the solution was fully dissolved, and the insolubles were filtered off; 3g of the reducing agent glycine was added to the obtained solution, and stirred to fully dissolve it; ...

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Abstract

The invention belongs to the field of recycling rare-earth permanent magnet waste, and discloses a method for preparing Nd2Fe14B / Alpha-Fe nanocomposite magnetic powder by using solid waste of NdFeB. The method comprises the following steps: cleaning, drying and crushing solid waste of NdFeB, and then dissolving the same by using a strong acid solution to filter out insoluble substance, preparing nano-crystal mixed oxide from the obtained solution through a microwave auxiliary chemical synthesis method, a sol-gel method or a spray pyrolysis method; reducing the obtained nano-crystal mixed oxidethrough a reducing agent to obtain the Nd2Fe14B / Alpha-Fe nanocomposite magnetic powder. The method disclosed by the invention is simple in process, economic and environment-friendly; the defect thatthe traditional wet metallurgy is long in process, large in energy consumption and serious in pollution is avoided, and the high-valuable utilization of the waste is realized at the same time, so thatthe obtained Nd2Fe14B / Alpha-Fe nanocomposite magnetic powder is fine in crystalline gain, uniform in components and strong in exchange coupling effect.

Description

technical field [0001] The invention belongs to the field of recycling rare earth permanent magnet waste, and in particular relates to a method for preparing NdFeB solid waste from NdFeB. 2 Fe 14 The method of B / α-Fe nanocomposite magnetic powder. Background technique [0002] NdFeB is a permanent magnet material with high coercive force, high remanence and high energy product, known as the "permanent magnet king". As the third generation of rare earth permanent magnets, NdFeB is widely used in motors. Compared with traditional motors, NdFeB motors have the advantages of light weight, high efficiency, strong controllability, high cost performance, energy saving and environmental protection, and have been widely used in electronic information, automobile industry, medical equipment, energy transportation and many other fields. At the same time, with the improvement of the comprehensive performance of NdFeB and the reduction of production costs, its application has graduall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/11H01F41/00
CPCH01F1/11H01F41/00
Inventor 刘仲武田忆兰钟喜春邱万奇焦东玲
Owner SOUTH CHINA UNIV OF TECH
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