Technique and equipment for preparing Nano granules in high purity by using method of comminution by gas stream

A technology of nanoparticle and jet milling, which is applied in separation methods, dispersed particle filtration, chemical instruments and methods, etc. It can solve difficult problems such as reducing surface free energy, improving fluidity and preventing agglomeration

Inactive Publication Date: 2007-10-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of the classification principle and classification accuracy of the classifying wheel, it is still difficult to realize the separation of nanoparticles and air through the method of classifying wheel.

Method used

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  • Technique and equipment for preparing Nano granules in high purity by using method of comminution by gas stream
  • Technique and equipment for preparing Nano granules in high purity by using method of comminution by gas stream
  • Technique and equipment for preparing Nano granules in high purity by using method of comminution by gas stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of nano-sized alumina particles by airflow pulverization of alumina granulation balls

[0042] The scanning electron microscope photo of the alumina granulation balls before pulverization is shown in Figure 4. In the figure, the alumina granulation balls before pulverization appear as spherical particles of tens of microns, and there are almost no alumina particles with a particle size of less than 1 micron. The particle size of the alumina granulation balls before crushing was measured by a Malvern 2000 particle size analyzer as 1-50 μm.

[0043] The steps of pulverizing alumina granulation balls (material) by adopting the preparation process and the preparation device of the present invention include:

[0044] The first step: placing alumina granulation balls (materials) in the crushing chamber 106, the amount of alumina granulation balls placed is 500g;

[0045] Second step: after drying the high-pressure gas (pressure 0.6MPa) produced by the a...

Embodiment 2

[0050] Example 2 Preparation of modified nano-scale alumina particles by airflow milling method for alumina granulation balls

[0051] The first step: same as embodiment 1;

[0052] The second step: similar to Example 1, except that the temperature of the dry high-pressure gas is 60°C;

[0053] The third step: similar to Example 1, the difference is that the crushing system 1 is connected with the modifier injection system 4 (see Figure 1A), and the titanate coupling agent NDZ-401 is sprayed at the same time as the crushing The surface modification treatment is carried out on the alumina material to increase the fluidity of the particles and prevent the agglomeration of the particles after crushing. The amount by weight of the titanate coupling agent NDZ-401 is 1.5% of the material.

[0054] For the modified nano-scale alumina particles prepared above, the particle size of 45% of the particles in the pulverized alumina granulation balls was measured by Malvern 2000 particle ...

Embodiment 3

[0057] Example 3 Preparation of nano-scale silicon dioxide particles by jet milling method for silicon dioxide

[0058] The first step, second step are identical with embodiment 1;

[0059] The third step: similar to Example 1, except that the crushing time is 2 hours.

[0060] For the nano-scale silicon dioxide (SiO2) prepared above 2 ) particles were measured by Malvern 2000 particle size analyzer after pulverization of silica (SiO 2 ) in the particle size of 54% in 20 ~ 1000nm.

[0061] In the preparation process of the present invention, the longer the crushing time, the smaller the particle size of the material.

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Abstract

An apparatus for preparing high-purity nanoparticles by airflow pulverizing method is composed of an air source system, a pulverizing system consisting of left and right reflux pipes and flow-up pipe to form a circulating loop of material, and air-solid separating system. Its process features that the raw material is carried by two supersonic jets for mutual and cyclic collision to obtain nanoparticles.

Description

technical field [0001] The invention relates to a process and device for pulverizing and preparing particles, more particularly, a process and device for preparing high-purity nano particles by air circulation and continuous pulverizing. Background technique [0002] Due to its many special properties, nanoparticle materials have a very wide range of applications in many fields. At present, the preparation methods of nanoparticles are generally divided into two categories: synthesis methods and pulverization methods. Synthetic methods to prepare nanoparticles mainly include gas evaporation method, liquid phase precipitation method, sol-gel method and so on. The pulverization method to prepare nanoparticles is currently mainly using mechanochemical methods to prepare nanoparticles. When using synthetic methods to prepare nanoparticles, the prepared materials are very limited, and using mechanochemical methods such as media milling to prepare nanoparticles, due to the wear o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/06B02C23/08B02C23/06B01D53/26B01D46/00B01D29/11
Inventor 沈志刚蔡楚江麻树林邢玉山
Owner BEIHANG UNIV
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