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A jet mill sorting device and method capable of improving powder particle size distribution

A sorting device and particle size distribution technology, applied in grain processing, recycling technology, etc., can solve the problem of uneven distribution of powder particles, achieve the effect of improving powder particle size distribution, simple structure, and reducing probability

Active Publication Date: 2022-06-07
山西金山磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of uneven distribution of powder particles in the powder making process of NdFeB production, the present invention provides a jet mill sorting device and method that can improve the powder particle size distribution

Method used

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  • A jet mill sorting device and method capable of improving powder particle size distribution
  • A jet mill sorting device and method capable of improving powder particle size distribution
  • A jet mill sorting device and method capable of improving powder particle size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using the sorting device and sorting method provided by the present invention, add 500kg of N48 grade coarse powder into the grinding chamber, set the speed of the sorting wheel (4200 rpm), the grinding pressure is 0.5Mpa, the deflection nozzle pressure is 0.2Mpa, and the grinding The valve opening is 90%, the grinding chamber pressure is 50kPa, and the qualified powder is prepared, mixed for 180 minutes, and the particle size distribution is detected by sampling.

[0023] Using the sorting parameters, select the appropriate sorting wheel speed according to different grades of powder, respectively prepare 500kg of N50, N52, 35H powder, mix for 180 minutes, and take samples to check the particle size distribution. The average value of the calculated particle size data is shown in the following table:

[0024] X10μm X90μm X99μm SMDμm X90 / X10 Example 1 1.58 6.96 8.03 2.96 4.40

Embodiment 2

[0026] Using the sorting device and sorting method provided by the present invention, add 500kg of N48 grade coarse powder into the grinding chamber, set the speed of the sorting wheel (4200 rpm), the grinding pressure is 0.6Mpa, the deflection nozzle pressure is 0.1Mpa, and the grinding The valve opening is 92%, the grinding chamber pressure is 55kPa, and the qualified powder is prepared, mixed for 180 minutes, and the particle size distribution is detected by sampling. Using the sorting parameters, select the appropriate sorting wheel speed according to different grades of powder, respectively prepare 500kg of N50, N52, 35H powder, mix for 180 minutes, and take samples to check the particle size distribution. The average value of the calculated particle size data is shown in the following table:

[0027] X10μm X90μm X99μm SMDμm X90 / X10 Example 2 1.76 7.56 8.92 3.15 4.30

Embodiment 3

[0029]Using the sorting device and sorting method provided by the present invention, add 500kg of N48 grade coarse powder into the grinding chamber, set the rotating speed of the sorting wheel (4200 rpm), the grinding pressure is 0.55Mpa, the deflection nozzle pressure is 0.2Mpa, and the grinding The valve opening is 95%, the grinding chamber pressure is 60kPa, and the qualified powder is prepared, mixed for 180 minutes, and the particle size distribution is detected by sampling. Using the sorting parameters, select the appropriate sorting wheel speed according to different grades of powder, respectively prepare 500kg of N50, N52, 35H powder, mix for 180 minutes, and take samples to check the particle size distribution. The average value of the calculated particle size data is shown in the following table:

[0030] X10μm X90μm X99μm SMDμm X90 / X10 Example 3 1.74 7.20 8.56 3.08 4.10

[0031] Reference example:

[0032] Using the conventional j...

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Abstract

The invention discloses a jet mill sorting device and method capable of improving powder particle size distribution, and relates to the field of neodymium-iron-boron powder production. The sorting device is set on the milling chamber of the jet mill, including deflecting nozzles and porous bottom nozzles. The deflecting nozzles are evenly distributed in the nozzle holes opened in the milling chamber along the circumferential direction, and are arranged along the horizontal direction. The deflecting nozzles extend into the milling chamber, and the axis line There is a deflection angle in the radial direction of the grinding chamber; the porous bottom nozzle is installed at the spraying place at the bottom of the cone of the grinding chamber. The lower opening has a rotational deflection angle. The invention makes the airflow in the grinding chamber rotate in the horizontal direction, and utilizes the centrifugal force, the crushed powder rises to enter the sorting wheel for sorting, the coarse particles are thrown out along the tangential direction, fall along the side wall of the grinding chamber, and re-enter the fluidization Bed impact grinding. The invention can greatly reduce the probability of coarse particles in the ground powder entering the sorting wheel, thereby improving the particle size distribution of the sorted powder.

Description

technical field [0001] The invention relates to the field of NdFeB powder production, in particular to a jet mill sorting device and method capable of improving the particle size distribution of powder. Background technique [0002] In the production process of NdFeB materials, powder preparation is mainly completed by crushing and sorting by jet mill after hydrogen crushing. However, the powder separation of the current jet mill mainly relies on the centrifugal separation of the separation wheel. Before the powder crushed by the fluidized bed enters the separation wheel, due to the large kinetic energy of the coarse powder, it will be driven into the separation wheel blade. Enclosed by the fine powder, a considerable part cannot be effectively separated by the sorting wheel, and enters the qualified powder, which seriously affects the particle size classification of the powder. The particle size of the NdFeB powder is inconsistent, which greatly affects the product performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C19/06B02C23/32
CPCY02W30/50
Inventor 韩志明张葆华郭敬东张敏刚赵亚利杨连圣赵菁董文
Owner 山西金山磁材有限公司