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Reproduction and utilization method of powder generated in mechanically processing sintered Nd-Fe-B permanent magnet

A technology of mechanical processing and processing method, which is applied in the processing field of recycling and recycling of powder chips generated after sintered NdFeB permanent magnets are mechanically processed, and achieves the effects of less investment, simple equipment and facilities, and low value

Inactive Publication Date: 2007-08-15
SHANXI HUIQIANG MAGNETIC MATERIAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the above-mentioned problems existing in the processing method of powder chipping and recycling in the existing chemical method, the present invention provides a new processing method for the processing of powder chipping and recycling of sintered NdFeB permanent magnets after machining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The treatment method for the recycling of powder chips produced after machining of sintered NdFeB permanent magnets: the NdFeB powder chips formed after machining and other sundries attached to the processing process are mixed together and collected together; firstly, use The method of magnetic separation removes the impurities, and the NdFeB powder containing water and oil is separated from it; then the sorted NdFeB powder containing water and oil is baked in a vacuum oven: baking Baking should be carried out under a vacuum condition of not less than 1Pa. After the vacuum condition is reached, first keep warm at 30°C-35°C (30°C, 31°C, 32°C, 33°C, 34°C, 35°C) to make the NdFeB powder Shave and dry to a semi-dry state, and then bake at 60°C-65°C (60°C, 61°C, 62°C, 63°C, 64°C, 65°C) until completely dry, so that completely dry NdFeB powder can be obtained (purity above 99.9%);

[0021]When making NdFeB300 / 110 brand sintered NdFeB permanent magnets, firstly carry out batc...

Embodiment 2

[0026] The treatment method for obtaining the regenerated NdFeB powder is the same as that of Example 1.

[0027] When making NdFeB280 / 135 brand sintered NdFeB permanent magnets, firstly carry out batching, smelting, and make 215 kg of coarse powder according to the usual process, and then use 90 kg of coarse powder to prepare fine powder according to the usual process (at this time, the oxygen intake is 90ppm- 120ppm). Add 7.5 kg of the regenerated NdFeB powder to the remaining 125 kg of normal coarse powder to produce a fine powder, but when the fine powder is made, the oxygen intake is lowered to 20ppm-50ppm, and then the regenerated NdFeB powder is added and the two fine powders added with regenerated NdFeB powder were mixed and formed separately, and then the two materials were sintered and tempered together in the same sintering furnace to produce a blank. After testing the magnetic properties, the magnet with regenerated NdFeB powder was compared with that without Comp...

Embodiment 3

[0032] The treatment method for obtaining the regenerated NdFeB powder is the same as that of Example 1.

[0033] When making NdFeB280 / 96 brand sintered NdFeB permanent magnets, first carry out batching, smelting, and make 192 kg of coarse powder according to the usual process, and then use 100 kg of coarse powder to prepare fine powder according to the usual process, (the amount of oxygen input at this time is 90ppm -120ppm), mixing, and then the remaining 92 kilograms of coarse powder are produced into fine powder, but the amount of oxygen input is lowered to 20ppm-50ppm when fine powder is made, and the regenerated NdFeB powder is mixed before it is made into fine powder Add 7.4 kg to mix the materials together, and then shape the two fine powders without adding recycled NdFeB powder and adding recycled NdFeB powder separately, and then sinter and temper the two materials together in the same sintering furnace to produce a blank. After testing Magnetic properties, compared ...

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Abstract

The invention relates to a method for regenerating chip produced by sintering neodymium iron boron permanent magnet, comprising that first using magnetic selection to remove foreign material and select out NdFeB chip which contains water and oil, then bakes and dries the chip in vacuyum drying box, adds the regenerated NdFeB powder into general NeFeB powder to be mixed uniformly. And the invention uses physical method with simple process, simple device and low cost, while the regenerated NdFeB alloy powder is cheaper than non-regenerated material.

Description

technical field [0001] The invention relates to the treatment of powder chips generated after machining of sintered NdFeB permanent magnets, in particular to a processing method for recycling and utilizing the powder chips generated after mechanical processing of sintered NdFeB permanent magnets. Background technique [0002] Since the 1980s, functional materials, ecological environment materials, and intelligent materials have played an increasingly important role in the modern civilization and social progress of human society. Among functional materials, permanent magnet materials occupy an important position and have been recognized internationally. Take the average amount of permanent magnet materials used in a country's households as one of the criteria to measure a country's civilization and development. Among many permanent magnet materials, the third-generation rare earth permanent magnet material - sintered NdFeB (chemical name NdFeB) has become the preferred perman...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F8/00B22F3/16H01F1/08
CPCY02W30/50
Inventor 张敏张锋锐祁三文康振东
Owner SHANXI HUIQIANG MAGNETIC MATERIAL MFG
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