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Method for preparing high-purity aluminium oxide

An alumina, high-purity technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of complex operation, numerous sintering steps, and the purity of alumina powder cannot reach the level of 5N, achieving high purity and few steps. , the effect of improving the purity

Active Publication Date: 2014-10-08
浙江格洋新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main methods for preparing high-purity alumina in my country. One is the thermal decomposition method of aluminum carbonate amine. The purity of the alumina powder prepared by this method cannot reach the level of 5N. The other method is the sintering method. There are many steps in the method and the operation is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of high-purity alumina, comprising the following steps:

[0025] (1) Add isobutanol and metal aluminum to the synthesis tower, add catalyst aluminum sulfate, and react for 1 hour at a temperature of 110°C to obtain aluminum isobutoxide; pass aluminum isobutoxide through ion exchange resin; wherein, isobutoxide is The mol ratio of butanol and metallic aluminum is 4: 1, and the weight of aluminum sulfate is 0.5% of the total weight of butanol and metallic aluminum; The consumption of ion exchange resin is 40% of weight of aluminum isobutoxide; Aluminum isobutoxide passes through ion exchange resin The time is 3h.

[0026] (2) Move the aluminum isobutoxide obtained in step (1) into a vacuum distillation tower, heat to 150° C., and obtain high-purity aluminum isobutoxide after vacuum distillation;

[0027] (3) Heat pure water to 80°C, add aluminum isobutoxide and catalyst stearic acid obtained in step (2), carry out hydrolysis reaction under stirring c...

Embodiment 2

[0036] A preparation method of high-purity alumina, comprising the following steps:

[0037] (1) Add butanol and metal aluminum to the synthesis tower, add catalyst aluminum sulfate, and react for 2 hours at a temperature of 90°C to obtain aluminum butoxide, which is passed through the ion exchange resin; wherein butanol and metal aluminum The molar ratio is 4:1, the weight of aluminum sulfate is 1.5% of the total weight of butanol and aluminum metal; the consumption of ion exchange resin is 20% of the weight of aluminum butoxide, and the time for aluminum butoxide to pass through the ion exchange resin is 2h;

[0038] (2) move the aluminum butoxide obtained in the step (1) into a vacuum distillation tower, heat to 180° C., and obtain high-purity aluminum butoxide after vacuum distillation;

[0039] (3) Heat pure water to 60°C, add the aluminum butoxide obtained in step (2) and catalyst stearic acid, carry out hydrolysis reaction under stirring conditions, and obtain hydrated ...

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Abstract

The invention discloses a method for preparing high-purity aluminium oxide. The method comprises the following several steps of: (1) reacting butyl alcohol and metal aluminium; (2) carrying out reduced-pressure distillation; (3) hydrolyzing; (4) calcining for the first time; (5) ball milling; and (6) calcining for the second time. According to the method, the aluminium butoxide is prepared, and then the hydrolysis and the calcining are carried out, so that a few steps are needed; butanol can be recycled for multiple times, and the prepared aluminium oxide is high in purity and reaches 5N after being detected by adopting ICP-MS; the average particle diameter is small and 0.01-0.03 micrometers; the specific area is 3-6 m<2> / g. The method disclosed by the invention can enhance the purity of the aluminium butoxide through the reduced-pressure distillation, thereby enhancing the purity of aluminium oxide; the method disclosed by the invention ensures the formation of aluminium oxide crystal grains and enhances the purity of the aluminium oxide by adopting ion exchange resin for further removing impurities; and the preparation process is pollution-free, low in energy consumption, environmental-friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing high-purity alumina. Background technique [0002] With the rapid development of high-tech industry, the demand for high-purity alumina powder is increasing day by day, and the market prospect is very broad. At present, the output of high-pressure sodium lamps in my country has reached 100 million, and the annual demand for alumina IC substrates exceeds 1 million square meters. Products such as sapphire IC substrates, metal halide lamps, automotive lamps, and digital windows have also been put into the market one after another. According to preliminary estimates, the annual demand for high-purity alumina powder in the Chinese market alone can reach more than 10,000 tons, and the amount is as high as 8 billion RMB, while the scale of the international market is even more impressive. [0003] At present, there are two main methods for preparing high-purity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 李春松
Owner 浙江格洋新材料股份有限公司
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