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Rare-earth doped spinel type ferrite magnetic powder prepared based on NdFeB wastes and preparation method thereof

A spinel type, ferrite magnetic technology, applied in the field of comprehensive utilization of waste resources, 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

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Problems solved by technology

According to its technical plan, while utilizing Fe element resources, a large amount of Mn and Zn elements are added and fully leached together with Fe elements, and a large amount of sulfuric acid, ammonium sulfide, and ammonium fluoride are required in the leaching, purification, and co-precipitation links , 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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  • Rare-earth doped spinel type ferrite magnetic powder prepared based on NdFeB wastes and preparation method thereof
  • Rare-earth doped spinel type ferrite magnetic powder prepared based on NdFeB wastes and preparation method thereof
  • Rare-earth doped spinel type ferrite magnetic powder prepared based on NdFeB wastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 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, Zn element content 0.25g, Al element content 0.42g.

[0077] Take 200Kg 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 90°C, and the pH value at the end of the leaching is controlled to be 1.8).

[007...

Embodiment 2

[0095] In addition, respectively get 50% total amount of excellent melting waste slag coarse powder and iron miscellaneous components among the embodiment 1 for the test of next step.

[0096] 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, Ni element replacement agent selects nickel chloride hexahydrate (98% purity) for use in the divalent metal replacement agent, all the other are with embodiment 1.

[0097] The difference from Example 1 in the process of preparing the precursor and magnetic powder is that: the reduction annealing temperature of the pulverized magnetic powder is 950° C., and the annealing time is 1.5 hours.

[0098] After testing, its saturation magnetization temperature is 37.52emu / g, its coercive force is 1817.09Oe, and its remanence is 16.24emu / g.

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Abstract

The invention discloses rare-earth doped spinel type ferrite magnetic powder prepared based on NdFeB wastes and a preparation method thereof. The structural formula of the spinel type ferrite is AB2O4, non-ferrous replacing elements of sites A of the structural formula are totally or partially originated from the NdFeB wastes, and doped replacing elements of sites B of the structural formula are totally or partially originated from the NdFeB wastes. According to the rare-earth doped spinel type ferrite magnetic powder 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 spinel magnets through carrying out resource utilization, doping and replacing 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 in particular relates to a rare earth-doped spinel ferrite magnetic powder 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. At present, the domestic NdFeB industry has reached an annual scale of 100,000 tons and is still growing. In terms of chemical composition, about 30% of NdFeB magnets are rare earth elements (more than 90% of which are Nd), 65-69% are Fe elements, and 1.1-1.2% B elements; in order to obtain different properties, Some rare earth elements such as Pr, Dy, Tb, Gd are often added to the magnetic material to replace Nd, and transition metal elements such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/34C04B35/622C22B59/00C22B7/00
CPCY02P10/20
Inventor 梁浩梁健
Owner LIANYUNGANG ZHAOYU NEW MATERIAL IND
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