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Preparation method of high purity aluminium oxide powder

A high-purity alumina and aluminum hydroxide technology, which is applied in the preparation of alumina/hydroxide, can solve problems such as adverse effects on the ecological environment, and achieve the effects of high true density, fine particles, and low sodium content

Inactive Publication Date: 2007-01-31
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most mature preparation technology is to prepare high-purity alumina by calcining aluminum ammonium sulfate, but this method will produce a large amount of SO in the process of preparing alumina. 3 , causing adverse effects on the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] High-purity aluminum hydroxide is prepared by hydrating high-purity aluminum ingots with water. First, put high-purity aluminum flakes into a hot water bath, then add an appropriate amount of choline into the water bath, and boil the mixture to 80°C to make it Reaction, boiling time 50 minutes, soluble aluminate and hydrogen produced by the reaction. Then the temperature is cooled to room temperature, the solution is mixed with hydrochloric acid, the pH value is adjusted to about 7.5, and the precipitate of hydroxide is prepared, and aluminum hydroxide in the form of gibbsite is obtained after drying and dehydration. Alumina can be obtained by treating the aluminum hydroxide prepared above in a muffle furnace at 1100°C for 8 hours, and then putting the alumina in a jet mill for crushing and sieving. A high-purity alumina powder with a single size is obtained.

[0025] The performance of the obtained powder:

[0026] High chemical purity (≥99.999%),

[0027] Fine part...

Embodiment 2

[0031] High-purity aluminum hydroxide is prepared by hydrating high-purity aluminum ingots with water. First, put high-purity aluminum flakes into a hot water bath, then add an appropriate amount of hexamethylenetetramine into the water bath, and boil the mixture to 85 ℃, boiling time 40 minutes, make it react, the soluble aluminate and hydrogen produced by the reaction. Then the temperature is cooled to room temperature, the solution is mixed with hydrochloric acid, the pH value is adjusted to about 7, and the precipitate of hydroxide is prepared, and aluminum hydroxide in the form of gibbsite is obtained after drying and dehydration. Alumina can be obtained by treating the above-prepared aluminum hydroxide in a furnace with iron-chromium-aluminum wire as a heating element at 1150°C for 8 hours, and then pulverizing the alumina in a jet mill. High-purity, single-sized alumina powder.

[0032] The performance of the obtained powder:

[0033] High chemical purity (≥99.999%), ...

Embodiment 3

[0038] High-purity aluminum hydroxide is prepared by hydrating high-purity aluminum ingots with water. First, put high-purity aluminum flakes into a hot water bath, then add an appropriate amount of dopamine into the water bath, and boil the mixture to 80°C for 45 minutes. Make it react, the soluble aluminate and hydrogen produced by the reaction. Then the temperature is cooled to room temperature, the solution is mixed with hydrochloric acid, the pH value is adjusted to about 8, the precipitate of hydroxide is prepared, and aluminum hydroxide in the form of gibbsite is obtained after drying and dehydration. Aluminum hydroxide obtained above is treated in a muffle furnace at 1100°C for 10 hours to obtain alumina, and then the alumina is pulverized in a jet mill. High-purity, single-sized alumina powder.

[0039] The performance of the obtained powder:

[0040] High chemical purity (≥99.999%),

[0041] Fine particles (≈0.15μm),

[0042] α-Al 2 o 3 High content (α phase ≈ ...

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Abstract

The present invention relates to a preparation method of high-purity aluminium oxide powder body. It is characterized by that it adopts aluminium sheet whose purity is 99.9999% and organic alkal; and makes them be mutually reacted in hot water bath to obtain the precipitate of aluminium hydroxide, then the precipitate is calcined at 1100-1200deg.C and ground so as to obtain high-purity ultrafine aluminium oxide powder body. The described organic alkal; includes any one of choline, hexamethohydrotetramine and dopamine.

Description

technical field [0001] The invention relates to a preparation method of high-purity alumina powder. More specifically, the present invention relates to a kind of aluminum hydroxide [Al(OH) that adopts metal aluminum sheet and organic base to exist in the form of gibbsite. 3 ·3H 2 O], and then through special treatment to prepare high-purity alumina powder preparation method. The invention belongs to the field of alumina powder preparation. Background technique [0002] al 2 o 3 Ceramics play an extremely important role in multi-chip packaging ceramic multilayer electronic substrate materials, transparent window materials, phosphor carriers, ceramic sensors, bioceramics, immobilized enzyme carriers, and other functional ceramics and structural ceramics. Al 2 o 3 Fine ceramics are considered to be one of the basic materials leading to the high-tech field in the 21st century. With the continuous development of high-tech, the requirements for raw materials are getting high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42
Inventor 冯涛赵学国王士维施鹰蒋丹宇施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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