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Preparation method of aluminum oxide powder

An alumina powder and alumina technology, applied in the field of alumina powder preparation, can solve the problems of high material viscosity and poor powder fluidity, and achieve the effects of reducing material pollution, improving fluidity and reducing production costs

Inactive Publication Date: 2016-12-07
刘冠华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for preparing alumina powder in China, among wh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The aluminum hydroxide produced by the direct hydrolysis method has a moisture content of 30% and a particle size of D50: 15 μm as the preparation of alumina, which is calcined through a tunnel kiln to obtain alumina powder with an angle of repose of 34°, and the initial temperature of calcination is 30 ℃, the heating rate is 4°C / min, the temperature is raised to 250°C for 3 hours; the heating rate is 7°C / min, the temperature is raised to 750°C for 3 hours, and then the temperature is lowered to below 200°C in 2 hours. The sintering atmosphere in the tunnel kiln is flowing air, and the pressure in the tunnel kiln is 75kpa.

Embodiment 2

[0017] The aluminum hydroxide produced by the direct hydrolysis method has a moisture content of 34% and a particle size of D50: 13 μm as the preparation of alumina. Calcining through a tunnel kiln can obtain alumina powder with an angle of repose of 32°. The initial temperature of calcination is 30 ℃, the heating rate is 3°C / min, the temperature is raised to 240°C for 3 hours; the heating rate is 6°C / min, the temperature is raised to 750°C for 3 hours, and then the temperature is lowered to below 200°C in 2 hours. The sintering atmosphere in the tunnel kiln is flowing air, and the pressure in the tunnel kiln is 74kpa.

Embodiment 3

[0019] The aluminum hydroxide produced by the direct hydrolysis method has a moisture content of 35% and a particle size of D50: 20 μm as a material for preparing alumina. Calcining through a tunnel kiln can obtain alumina powder with an angle of repose of 30°. The initial temperature of calcination is 30° ℃, the heating rate is 2.5°C / min, the temperature is raised to 150°C for 3 hours; the heating rate is 7.5°C / min, the temperature is raised to 800°C for 3 hours, and then the temperature is lowered to below 200°C in 2 hours. The sintering atmosphere in the tunnel kiln is flowing air, and the pressure in the tunnel kiln is 77kpa.

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Abstract

The invention discloses a preparation method of aluminum oxide powder. The preparation method comprises the following steps: taking aluminum hydroxide produced by virtue of a direct hydrolytic method as a precursor for preparing aluminum oxide, and calcining by virtue of a tunnel kiln so as to obtain aluminum oxide powder with an angle of repose of 30-35 degrees, wherein a heating curve during the calcining of the tunnel kiln is as follows: heating to 150-300 DEG C in a heating rate of 2.5-5 DEG C/min, maintaining the temperature for 3 hours, heating to 700-800 DEG C in a heating rate of 5-7.5 DEG C/min, maintaining the temperature for 3 hours, and cooling to be below 200 DEG C within 2 hours. Aluminum oxide prepared by virtue of the preparation method has fluidity, so that a large number of inferior-quality products are reduced.

Description

technical field [0001] The invention belongs to the field of alumina powder processing, in particular, the invention relates to a preparation method of alumina powder. Background technique [0002] With the development of industrial production towards automation and intelligence, it is inevitable to replace labor-intensive ones with intelligent machinery, and the implementation of intelligence and automation will have strict requirements on the characteristics of alumina powder, especially the fluidity of alumina powder Especially critical. [0003] At present, there are many methods for preparing alumina powder in China, among which the alumina produced by the direct hydrolysis method has poor powder fluidity and high viscosity. Moreover, the defective alumina materials produced account for a large proportion, which increases production costs and reduces market competitiveness. Materials with high viscosity and poor fluidity are difficult to automate, or require a lot of ...

Claims

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Application Information

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IPC IPC(8): C01F7/30
CPCC01F7/30C01P2006/80
Inventor 李源任红波刘冠华刘江华
Owner 刘冠华