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High-performance permanent-magnet ferrite pre-sintered material prepared based on NdFeB wastes and preparation method thereof

A permanent magnet ferrite, NdFeB technology is applied in the field of comprehensive utilization of waste resources, which can solve the problems of high resource and energy consumption and low economic value.

Inactive Publication Date: 2015-03-25
LIANYUNGANG ZHAOYU NEW MATERIAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Mn-Zn ferrite prepared by the above technical scheme is a spinel type soft ferrite structure, and MFe 2 o 4 From the basic formula, it needs to add a large amount of Mn and Zn elements (the molar distribution reaches 50% of the Fe element) and perform full leaching together with the Fe element. A large amount of sulfuric acid, ammonium sulfide, Ammonium fluoride, lime and precipitant ammonium bicarbonate consume a lot of resources and energy, and the overall economic value is not high

Method used

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  • High-performance permanent-magnet ferrite pre-sintered material prepared based on NdFeB wastes and preparation method thereof
  • High-performance permanent-magnet ferrite pre-sintered material prepared based on NdFeB wastes and preparation method thereof
  • High-performance permanent-magnet ferrite pre-sintered material prepared based on NdFeB wastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Take a batch of scraps from the machining process of NdFeB permanent magnet materials and a mixture of grinding powder generated during the grinding process, wherein the weight ratio of scraps and grinding powders is 82:18. After testing, the above-mentioned metal elements in each 100g of NdFeB scrap include: total rare earth elements 32.77g (including Nd 29.57g, Pr 2.13g, Dy 0.65g, Gd 0.42g), Fe element content 60.35g, Co element content 2.11g g. Al element content 0.42g, Zn element content 0.25g (Cu, Nb element content not detected).

[0073] Take 2000Kg of the above-mentioned batch of NdFeB waste materials, grind and pulverize them through a ball mill to an average particle size of less than 100 mesh, and oxidize and roast the pulverized materials in a rotary kiln (calcination temperature 900 ° C, roasting time 1 hour), and then The oxidized and roasted material is leached with 3N hydrochloric acid (leaching temperature is 85°C, and the pH value of the leaching end p...

Embodiment 2

[0094] In addition, 20% of the total amount of the material after elution and purification in Example 1 was used for batching before pre-calcination. Carry out batching according to the batching table of embodiment 1, differ from embodiment 1, do not add CaCO in batching 3 , boric acid.

[0095] According to the same method of embodiment 1, calcined coarse powder is obtained.

[0096] Crystallinity analysis of calcined material:

[0097] Samples were taken for SEM scanning electron microscope analysis, and the generated ferrite grains were analyzed at different resolutions. The analysis showed that the calcined material was fine and uniform in crystallization, and the grain size was between 1 and 2 μm.

[0098] Magnetic performance testing of pre-fired materials:

[0099] Take pre-fired coarse powder samples, add different contents of secondary additives, and carry out wet grinding; after wet grinding, the particle size of the powder is 0.8 μm, hang the filter cloth to dry, a...

Embodiment 3

[0106] In addition, 20% of the total amount of the material after elution and purification in Example 1 was used for batching before pre-calcination.

[0107] According to Sr 0.72 Re 0.28 Fe 11.75 co 0.25 al 0.015 Zn 0.015 o 19 Carry out batching, all the other are with embodiment 1.

[0108] On the basis of the ingredients list, add 0.4wt% CaCO relative to the total amount of material 3 (98% purity), 0.1wt% boric acid (98% purity) as an additive.

[0109] The calcined coarse powder was obtained in a similar manner to Example 1, except that the calcined temperature used was 1250°C.

[0110] Crystallinity analysis of calcined material:

[0111] Samples were taken for SEM scanning electron microscope analysis, and the generated ferrite grains were analyzed at different resolutions. The analysis showed that the dry calcined material crystallized finely and uniformly, and the grain size was between 1 and 2 μm.

[0112] Magnetic performance testing of pre-fired materials:...

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Abstract

The invention discloses a high-performance permanent-magnet ferrite pre-sintered material prepared based on NdFeB wastes and a preparation method thereof. The ferrite pre-sintered material has a hexagonal-crystal-system ferrite structure and is subjected to combined ion substitution through rare-earth elements and non-rare-earth elements, such as Co; in the pre-sintered material, a Fe element is totally originated from the NdFeB wastes; various metallic rare-earth elements for combined ion substitution are totally or partially originated from the NdFeB wastes. According to the high-performance permanent-magnet ferrite pre-sintered material prepared based on the NdFeB wastes and the preparation method thereof, in the production process, secondary process wastes, which are plentifully generated during the hydrometallurgical rare-earth element recovery of the NdFeB wastes and have no proper resource values, are fully utilized; in the implementation of the technical scheme, the technology adopted by the invention and the currently-industrialized NdFeB waste rare-earth resource recovery process flows are docked in a seamless manner, and organic and reasonable combination is realized in the aspects of the improvement of performance of magnets through carrying out resource utilization and ion substitution on the secondary wastes, the simplicity and convenience of process implementation and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, and specifically relates to a high-performance permanent magnet ferrite calcined material produced based on NdFeB waste and a preparation method thereof. Background technique [0002] NdFeB permanent magnet material is the most powerful permanent magnet material discovered in 1982 so far, and has been widely used in computers, medical equipment, communication devices, electronic devices, magnetic machinery and other fields. With the rapid development of information industry, consumer electronics industry and new energy electric vehicle industry, the application fields of NdFeB permanent magnet materials are also expanding. In recent years, the output of NdFeB magnets in China has shown a rapid growth trend. At present, it has reached a scale of 100,000 tons per year and is still growing. From the perspective of the production process of NdFeB permanent magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 梁浩梁健
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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