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Industrial production method for superfine high-purity alpha-alumina

An alumina, fine and high technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of unindustrial production, high cost, harsh preparation process, etc., and achieve the effect of solving the problem of particle size and purity.

Active Publication Date: 2012-07-18
GUANGZHOU HUMAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the above method uses metal aluminum or aluminum alcohol as raw material, the preparation process is harsh, and the cost is high, so it can only stay in the laboratory stage and cannot be industrialized.

Method used

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  • Industrial production method for superfine high-purity alpha-alumina
  • Industrial production method for superfine high-purity alpha-alumina
  • Industrial production method for superfine high-purity alpha-alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] according to figure 1The process route shown prepares ultra-fine high-purity α-alumina; the XRD pattern of the boehmite raw material used is shown in figure 2 shown. In this example, the industrial production process for preparing ultrafine high-purity α-alumina includes the following steps:

[0040] 1) Add 200 kg of active boehmite (SPL powder produced by Guangzhou Huigu Chemical Co., Ltd.), 780 kg of water, and 20 kg of lactic acid in a 5-ton cylinder. At this time, the concentration of the dispersion is 20%. ;

[0041] 2) After dispersing for 2 hours with a high-speed shear disperser, add 10 kg of polyvinylpyrrolidone, and then disperse for 30 minutes. Filter the dispersion through a polymer membrane;

[0042] 3) Use an industrial centrifuge to separate the filtered liquid from solid to liquid. After the separation, put the solid into a tank, add water to disperse it, and then centrifuge it. Do this 5 times to make the conductivity of the liquid less than 2μS / c...

Embodiment 2

[0047] The basic process steps are the same as in Example 1, but the difference from Example 1 is that the water consumption of the dispersion needs to be reduced when spray drying, so that the concentration of boehmite in the dispersion becomes 5%.

Embodiment 3

[0049] The basic process steps are the same as in Example 1, but the difference from Examples 1 and 2 is that the water consumption of the dispersion needs to be further reduced when spray drying, so that the concentration of boehmite in the dispersion becomes 15%.

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Abstract

The invention discloses an industrial production method for preparing superfine high-purity alpha-alumina. The industrial production method comprises the following steps that: (1) boehmite is dispersed in unitary organic acid; (2) an obtained dispersing agent of the boehmite is filtered; (3) the dispersing agent of the boehmite is subjected to solid-liquid separation, washing and redispersion; (4) the dispersing agent with impurities being removed is subjected to spray drying; and (5) the dried boehmite obtained in the step (4) is subjected to high-temperature calcination. According to the invention, the purity and the grain size of the produced alpha-alumina are well guaranteed, and the purity and the grain size of a final product can reach the using requirements in a high-end electronic industry.

Description

technical field [0001] The present invention relates to a method for preparing powder materials used in the high-end electronics industry; more specifically, the present invention relates to an industrial production method of ultrafine high-purity α-alumina, the obtained ultrafine high-purity α-alumina and its use. technical background [0002] At present, α-alumina ultrafine powder is the main raw material of ceramic electronic products in the electronics industry, and the market demand for α-alumina ultrafine powder is also increasing rapidly with the development of the electronics industry. [0003] Chinese patent application CN101362604 discloses a method for preparing high-purity alumina powder. The method heats and melts refined aluminum, atomizes and pulverizes it by high-pressure air, adds water to cool it, and heats and hydrolyzes it to form aluminum hydroxide liquid, and then undergoes precipitation, After drying and calcining, high-purity α-alumina powder is obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 潘晓兵李生祥王芳
Owner GUANGZHOU HUMAN CHEM
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