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Superfine powder preparation method and device using jet static electricity

An ultra-fine powder and electrostatic composite technology, which is applied to the surface coating device, spray device, spray device, etc., can solve the problems of loss of charge of powder particles, weak dispersion effect, etc. Low cost and uniform particle size distribution

Inactive Publication Date: 2011-07-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of this method are high dispersion efficiency and no impurity pollution. The disadvantage is that after electrostatic dispersion, the charge of the powder particles will be lost in the form of conduction and discharge as the storage time prolongs, resulting in the weakening of the dispersion effect.

Method used

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  • Superfine powder preparation method and device using jet static electricity
  • Superfine powder preparation method and device using jet static electricity
  • Superfine powder preparation method and device using jet static electricity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, jet electrostatic dispersion of magnesium zinc ferrite powder

[0035] ① Place the magnesium zinc ferrite with an average particle size of 196.3um in a vacuum drying oven with a temperature of 70°C and a drying time of 2 hours.

[0036] ②The dried powder is placed in the high-speed air flow with high-voltage electric field for jet electrostatic composite dispersion. The high-speed air pressure is 1.0MPa, and the charging voltage is 50KV.

Embodiment 2

[0037] Embodiment 2, jet electrostatic dispersion of barium ferrite powder

[0038] ① Place barium ferrite with an average particle size of 12.9um in a vacuum drying oven with a temperature of 40°C and a drying time of 4 hours.

[0039] ②The dried powder is placed in the high-speed air flow with high-voltage electric field for jet electrostatic composite dispersion. The high-speed air flow pressure is 0.3MPa, and the charging voltage is 20KV.

Embodiment 3

[0040] Embodiment 3, jet electrostatic dispersion of barium ferrite powder

[0041] ① Place the magnesium zinc ferrite with an average particle size of 12.9um in a vacuum drying oven with a temperature of 60°C and a drying time of 6 hours.

[0042] ②The dried powder is placed in the high-speed air flow with high-voltage electric field for jet electrostatic composite dispersion. The high-speed air flow pressure is 0.7MPa, and the charging voltage is 30KV.

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Abstract

The invention relates to a method and a device for compositely preparing ultrafine powder by adopting jet current electrostatic recombination. The method is characterized by comprising the following: step 1, placing powder material inside a vacuum drying box for drying; and step 2, carrying out jet current crushing of the dried powder material in high-speed air current and electrostatic dispersion inside a high-voltage electric field charged area to obtain ultrafine powder. The device is characterized in that an air passage of an air compressor is connected with a jet current electrostatic disperser and a collector in turn; and the front end of the jet current electrostatic disperser is provided with a voltage regulator and a feeding bin. The method and the device have the advantages thatthe method has simple operation, low cost, high efficiency and even distribution of prepared powder granularity; and no chemical modifying agent, such as coupling agent and surfactant, is adopted during powder preparation, thereby preventing impurity pollution. The method and the device can be widely used in precision ceramics, magnetic material and rare earth material, and the like which has higher requirements on powder purity as well as in industries not suitable to adopt a wet method to prepare powder.

Description

technical field [0001] The invention relates to a method and device for preparing ultrafine powder by jet electrostatic compounding. The high-speed jet is used to pulverize the powder, and at the same time, the powder is charged by a high-voltage electric field, and the powder is kept highly dispersed by using the electrostatic Coulomb effect. Thereby preparing ultrafine powder with excellent performance. Background technique [0002] Due to the characteristics of large specific surface area, high surface energy and high surface activity, ultrafine powder has excellent physical and chemical properties and special mechanical, thermal, optical, magnetic and other characteristics that traditional conventional particles do not have. However, due to the high surface energy of the particles and the van der Waals force, electrostatic force, and liquid bridge force between the particles, the ultrafine powder particles are very easy to adsorb each other and agglomerate. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C19/06B01J2/30B02C23/00B05B1/00
Inventor 张蓉刘骞周婷李雪莹
Owner NORTHWESTERN POLYTECHNICAL UNIV