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Multistage quenching process and equipment for NdFeB (neodymium iron boron) magnetic powder production

A quenching equipment and NdFeB technology are applied in the field of quenching devices, which can solve the problems of wasting water resources and energy, easy to freeze transportation pipelines, and high production costs, and achieve the effects of thorough quenching, improving quenching efficiency and saving rare earth metals.

Inactive Publication Date: 2014-05-28
湖南京湘磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The return water generated in the production process of NdFeB magnetic powder contains a lot of heat energy. Using a common heat exchanger to continuously input cooling water and discharge high-temperature return water will waste a lot of water resources and energy, making the production cost too high
Inert gas is needed in the production process of NdFeB magnetic powder, and the inert gas is most convenient to transport when it is in liquid state, but it is required to exist in gaseous state in the production process, and a large amount of heat energy is required to vaporize liquid inert gas. It is easy to freeze the pipeline, so it needs to provide heat

Method used

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  • Multistage quenching process and equipment for NdFeB (neodymium iron boron) magnetic powder production
  • Multistage quenching process and equipment for NdFeB (neodymium iron boron) magnetic powder production
  • Multistage quenching process and equipment for NdFeB (neodymium iron boron) magnetic powder production

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Experimental program
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Embodiment 1

[0023] Embodiment 1, the nozzle 1 of the present invention sprays the incoming material to the molybdenum wheel 2. The incoming material is generally molten steel at 1300 ° C. The rotating molybdenum wheel 2 continuously throws off the incoming material sprayed from above. A small amount of molybdenum Mo will be infiltrated during the process. Adding molybdenum to the material can improve the elastic limit, corrosion resistance and maintain permanent magnetism. The temperature of the tape is about 800°C, and the high-temperature strip is thrown into the barrel 3. The side of the molybdenum wheel 2 in the direction of throwing and throwing is provided with a barrel 3 corresponding to the inlet, and the upper part of the barrel 3 corresponds to the inlet. The other side of the feed port is provided with a downward-sloping primary cooling plate 4. After being thrown into the barrel 3, the high-temperature strip is blocked by the primary cooling plate 4 and folded obliquely downwar...

Embodiment 2

[0024]Embodiment 2, the present invention comprises nozzle 1, molybdenum wheel 2, feed barrel 3, primary cooling plate 4, secondary cooling plate 5, tertiary cooling plate 6, after the incoming material enters material barrel 3, the first cooling plate 4, The flow between the secondary cooling plate 5, the tertiary cooling plate 6 and the barrel wall of the barrel 3, the molybdenum wheel 2 is installed under the nozzle 1, and the incoming material is sprayed downward from the nozzle 1 to the molybdenum wheel 2, and the incoming material is generally 1300°C The rotating molybdenum wheel 2 continuously throws the incoming material sprayed from above, and the incoming material will infiltrate a small amount of molybdenum Mo when it comes into contact with the molybdenum wheel 2. Adding molybdenum to the material can improve the elastic limit, corrosion resistance and maintain Permanent magnetism, the incoming material is initially cooled down during this process to form a high-tem...

Embodiment 3

[0025] Embodiment 3, the inside of the first-stage cooling plate 4 is provided with a cavity for heat exchange and a cooling plate water outlet 41 and a cooling plate water inlet 42 communicating with the cavity, and continuously circulates and injects cooling water for heat exchange. The cooling plate 4 is maintained at a lower temperature. refer to Figure 1 to Figure 7 , and the rest are the same as the above-mentioned embodiment.

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Abstract

The invention discloses a multistage quenching process and multistage quenching equipment for NdFeB (neodymium iron boron) magnetic powder production, which mainly solve the technical problems that the quenching of the existing quenching device is not thorough, the quenching speed is slow, and the like. The key point of the technical scheme is that a nozzle (1) is used for ejecting supplied materials to a molybdenum wheel (2), the rotary molybdenum wheel (2) continually throws the supplied materials which are ejected from the upward side to form a high-temperature melt-spinning sheet, the high-temperature melt-spinning sheet is thrown into a charging basket (3), after the high-temperature melt-spinning sheet is thrown into the charging basket (3), the high-temperature melt-spinning sheet is stopped by a first-grade cooling plate (4) to be folded to the slanting downward side, first-grade quenching is completed, the high-temperature melt-spinning sheet is reflected from the first-grade cooling plate (4) to a second-grade cooling plate (5) to complete second-grade quenching, the high-temperature melt-spinning sheet is reflected from the inner wall of the charging basket (3) to a third-grade cooling plate (6) to complete three-grade quenching, and then flows to a nether vibrating screen (7) from a discharge hole, the high-temperature melt-spinning sheet is vibrated into a finished product gathering tank by the vibrating screen (7), the overall process of the quenching is carried out in a sealed environment which is full of inert gas, and the air pressure is kept at 2200 Pa. The multistage quenching process and the multistage quenching equipment for NdFeB magnetic powder production are mainly used for multistage rapid quenching.

Description

technical field [0001] The invention relates to a quenching device, in particular to a multi-stage quenching process and equipment for producing NdFeB magnetic powder. Background technique [0002] At present, the continuous rapid quenching process is a relatively advanced production method of NdFeB magnetic powder, and only a few enterprises have mastered the core technology of this process. The preparation of bonded NdFeB magnetic powder by the traditional arc smelting single-roll stripping method does not have very high requirements for alloy melting, but for continuous rapid quenching and stripping, the smelting requirements are higher, and high cleanliness is required, otherwise remelting The oxides and impurities in the final solution will block the nozzle and make the production impossible. Therefore, high-cleanliness smelting is the key technology of this process. This invention uses high-purity argon to protect the smelting process by heating up in a high-vacuum env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22D11/06H01F1/057F28D1/047
Inventor 鲍宇飞李运湘
Owner 湖南京湘磁业有限公司
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