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Preparation method of alumina particles

A technology of high-purity alumina and particles, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of low density of high-purity alumina particles, difficulty in reaching downstream customers, and high purity of alumina, so as to improve the bulk density and Intensity, reduce labor intensity, avoid pollution effect

Inactive Publication Date: 2015-04-01
连云港乐园新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-density and high-purity alumina particles are mainly used as raw materials for sapphire crystal growth. Due to the high purity and high density of alumina required by the process, high-purity alumina particles for sapphire can only be produced on a small scale by sugar coating machines in the past, and the original process produced The density of high-purity alumina particles is low, and it is difficult to meet the needs of downstream customers in terms of quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1, a method for preparing high-purity alumina particles. In this method, high-purity alumina powder is used as a raw material, and the high-purity alumina powder is firstly pulverized by a jet mill. After the powder is crushed by the jet mill, the particle size Form a normal distribution, D50 is controlled at 5 microns; then use a disc granulator to granulate, and after granulation, carry out high-temperature roasting at 1700°C, and the bulk density obtained by roasting is 3.2~3.6g / cm 3 High-purity alumina pellets.

Embodiment 2

[0013] Example 2, a method for preparing high-purity alumina particles. In this method, high-purity alumina powder is used as a raw material, and the high-purity alumina powder is firstly pulverized by a jet mill. After the powder is crushed by the jet mill, the particle size Form a normal distribution, D50 is controlled at 25 microns; then use a disc granulator to granulate, and after granulation, carry out high-temperature roasting at 1800°C, and the bulk density obtained by roasting is 3.2~3.6g / cm 3 High-purity alumina pellets.

Embodiment 3

[0014] Example 3, a method for preparing high-purity alumina particles. In this method, high-purity alumina powder is used as a raw material, and the high-purity alumina powder is firstly pulverized by a jet mill. After the powder is crushed by the jet mill, the particle size is Form a normal distribution, D50 is controlled at 15 microns; then use a disc granulator to granulate, and after granulation, carry out high-temperature roasting at 1750°C, and the bulk density obtained by roasting is 3.2~3.6g / cm 3 High-purity alumina pellets.

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Abstract

The invention relates to a preparation method of alumina particles. The method comprises the following steps: by taking high-purity alumina powder as a raw material, firstly, performing air-flow grinding to the high-purity alumina powder through an air-flow mill, wherein the size fraction of the powder is in normal distribution after air-flow grinding, and D50 is controlled at 5-25mm; then pelletizing through a disk pelletizer, then performing high-temperature roasting at 1700-1800DEG C, to obtain high-purity alumina particles with the volume density of 3.2-3.6g / cm<3>. According to the method, the pollution of equipment on the high-purity alumina powder during the grinding of powder can be avoided by adopting the air-flow mill; the full-automatic disk pelletizer is adopted during pelletizing, so that not only can the bulk density and strength of products be enhanced, and the powder falling of particles can be reduced, but also the labor intensity of workers can be greatly lightened. The product meets the demand of downstream sapphire production factories.

Description

technical field [0001] The invention relates to the technical field of a chemical powder forming method, in particular to a method for preparing high-purity alumina particles. Background technique [0002] High-density and high-purity alumina particles are mainly used as raw materials for sapphire crystal growth. Due to the high purity and high density of alumina required by the process, high-purity alumina particles for sapphire can only be produced on a small scale by sugar coating machines in the past, and the original process produced The density of high-purity alumina particles is low, and it is difficult to meet the needs of downstream customers in terms of quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing high-purity alumina particles with more reasonable process design and high product density for the deficiencies of the prior art. [0004] The technical problem to be solved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 朱立起李文成李方庆
Owner 连云港乐园新材料科技有限公司
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