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Preparation method of aluminum oxide cake

A technology of alumina and alumina fine powder, applied in the field of alumina cake processing, can solve the problems of small loading, friction pollution, different shapes, etc., and achieve the effects of small density, enhanced compressive strength, and uniform shape

Inactive Publication Date: 2021-04-13
NANJING FU HAO CRYSTAL MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina used in industry is strip-shaped, column-shaped, honeycomb-shaped and spherical, etc. The existing technologies for making high-purity alumina cakes are mostly formed by dry pressing of steel molds or made of polyurethane or rubber-based alumina cakes. Preparation method The organic mold is formed by cold isostatic pressing. The above two methods may cause friction pollution to be brought into the alumina, or the preparation method of the cold isostatic alumina cake has different shapes and sizes after static pressing. As a result, downstream manufacturers such as sapphire manufacturers have insufficient loading capacity when loading materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention relates to a kind of preparation method of alumina cake, comprises following preparation steps:

[0020] S1: Refining processing, calcining alumina at 1800 degrees Celsius, wet grinding it with a ball mill for 38 hours, washing with acid, washing with water, and drying it to make a fine powder for later use;

[0021] S2: Mix the slurry, put the alumina fine powder into the mixing tank, add the binder and water in turn, stir for 30 minutes and mix well, the binder is alumina fine powder, the ratio of alumina fine powder, aluminum sulfate solution and water is 8.5:1:0.5;

[0022] S3: Preforming, inserting the vacuum packaging bag inside the upper mold and the lower mold, extending the opening end of the vacuum packaging bag from the injection port of the upper mold, closing the mold, injecting the slurry into the vacuum packaging bag, Put the mold on the vibrating machine and vibrate to make a rough billet;

[0023] S4: Billet making, the upper mol...

Embodiment 2

[0027] On the basis of embodiment one, a kind of preparation method of alumina cake comprises following preparation steps:

[0028] S1: Refining processing, calcining alumina at 1600 degrees Celsius, wet grinding it with a ball mill for 42 hours, washing with acid, washing with water, and drying it to make a fine powder for later use;

[0029] S2: Mix the slurry, put the alumina fine powder into the mixing tank, add the binder and water in turn, stir for 40 minutes and mix well, the binder is alumina fine powder, the ratio of alumina fine powder, aluminum sulfate solution and water is 8.7:0.8:0.5;

[0030] S3: Preforming, inserting the vacuum packaging bag inside the upper mold and the lower mold, extending the opening end of the vacuum packaging bag from the injection port of the upper mold, closing the mold, injecting the slurry into the vacuum packaging bag, Put the mold on the vibrating machine and vibrate to make a rough billet;

[0031] S4: Billet making, the upper mol...

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PUM

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Abstract

The invention discloses a preparation method of an aluminum oxide cake, which comprises the following steps of: S1, refining: calcining aluminum oxide at 1800 DEG C, carrying out wet milling for 38 hours by using a ball mill, and carrying out acid washing, water washing and drying to obtain fine powder for later use; S2, slurry mixing: putting the fine aluminum oxide powder into a stirring tank, sequentially adding a binding agent and water, stirring for 30 minutes, and uniformly mixing; and S3, pre-forming: connecting a vacuum packaging bag into an upper mold and a lower mold in a sleeved mode, enabling the open end of the vacuum packaging bag to extend out of a material injection opening of the upper mold, closing the molds, injecting slurry into the vacuum packaging bag, placing the mold on a vibration machine, and manufacturing a rough blank through vibration. According to the preparation method of the aluminum oxide cake, aluminum oxide is ground into fine powder, so that the prepared cake is small in density, tight in adhesion degree, high in cake body compressive strength and not prone to deformation during static pressure, slurry is separated from a mold through the arranged vacuum packaging bag, and the slurry is prevented from being polluted.

Description

technical field [0001] The invention relates to the field of alumina cake processing, in particular to a preparation method of alumina cake. Background technique [0002] When alumina is used as a catalyst or a catalyst carrier for a catalytic reaction, its shape has a great influence on the catalytic reaction. The alumina used in industry is strip-shaped, column-shaped, honeycomb-shaped and spherical, etc. The existing technologies for making high-purity alumina cakes are mostly formed by dry pressing of steel molds or made of polyurethane or rubber-based alumina cakes. Preparation method The organic mold is formed by cold isostatic pressing. The above two methods may cause friction pollution to be brought into the alumina, or the preparation method of the cold isostatic alumina cake has different shapes and sizes after static pressing. As a result, downstream manufacturers such as sapphires have insufficient charging capacity when charging. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/6022C04B2235/606C04B2235/656C04B2235/6567
Inventor 邹少华邹磊王宏辉
Owner NANJING FU HAO CRYSTAL MATERIALS TECH