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Method for producing electron-grade thermal-resistant aluminum hydroxide

A technology of aluminum hydroxide and production method, which is applied in the production of electronic-grade high heat-resistant aluminum hydroxide and the production field of aluminum hydroxide, which can solve problems such as high cost and complicated process, and achieve clear grain boundaries and good crystal development , good dispersion effect

Active Publication Date: 2018-12-21
中铝山东有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complicated and the cost is extremely high

Method used

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  • Method for producing electron-grade thermal-resistant aluminum hydroxide
  • Method for producing electron-grade thermal-resistant aluminum hydroxide
  • Method for producing electron-grade thermal-resistant aluminum hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare aluminum hydroxide re-dissolved solution. After dissolution, the solution is diluted with water until the concentration of sodium oxide is 150g / l, the temperature is raised to 95°C, and activated carbon is added for impurity removal. The amount of impurity remover is 1g / l, and the impurity removal time is controlled at 40 minutes. After filtering, add water to dilute, the concentration of alumina reaches 70g / l, and obtain the decomposition stock solution, take 1000ml of decomposition stock solution and add 12ml of seeds, control the initial decomposition temperature of 75°C, the final decomposition temperature of 60°C, the decomposition time of 20 hours, after washing and drying Aluminum hydroxide fine powder is obtained. The preparation conditions and characteristics of the redissolved solution used in Example 1, the characteristics of the raw materials and the indicators of the obtained samples are shown in Table 1, Table 2 and Table 3 respectively.

[0035] ...

Embodiment 2

[0042] Prepare aluminum hydroxide re-dissolved solution. After dissolution, the solution is diluted with water until the concentration of sodium oxide is 180g / l, the temperature is raised to 90°C, and silica gel is added for impurity removal. The amount of impurity remover added is 5g / l, and the impurity removal time is controlled at 60 minutes. After filtering, add water to dilute, the concentration of alumina reaches 90g / l, and obtain the decomposition stock solution, take 1000ml of decomposition stock solution and add 12ml of seeds, control the initial decomposition temperature of 75°C, the final decomposition temperature of 60°C, the decomposition time of 20 hours, after washing and drying Aluminum hydroxide fine powder is obtained. The characteristics of the raw materials used in Example 2 and the obtained sample indexes are shown in Table 3 and Table 4 respectively.

[0043] Table 3. Raw material characteristics

[0044]

[0045] Table 4. Sample Specifications

[0...

Embodiment 3

[0048] Prepare aluminum hydroxide re-dissolved solution. After dissolution, add water to dilute the solution until the concentration of sodium oxide is 160g / l, raise the temperature to 95°C, add calcium oxide for impurity removal, the amount of impurity remover added is 4g / l, and the impurity removal time is controlled in 35 minutes. After filtering, add water to dilute, the concentration of alumina reaches 110g / l, and obtain the decomposition stock solution, take 1000ml of decomposition stock solution and add 18ml of seeds, control the initial decomposition temperature of 70°C, the final decomposition temperature of 60°C, the decomposition time of 25 hours, after washing and drying Aluminum hydroxide fine powder is obtained. The characteristics of the raw materials used in Example 3 and the obtained sample indexes are shown in Table 5 and Table 6 respectively.

[0049] Table 5. Raw Material Properties

[0050]

[0051] Table 6. Sample Specifications

[0052]

[0053] N...

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Abstract

The invention discloses a method for producing electron-grade thermal-resistant aluminum hydroxide. The method comprises the following steps: carrying out decontamination and purification on an aluminum hydroxide re-solution, adjusting solution molecules, and controlling decomposition speeds. Aluminum hydroxide micro powder produced by using the method is low in impurity content, the content of sodium oxide is up to 0.08%, the product granularity is 1-6mu m, reasonable granularity distribution is achieved, good crystal development is achieved, a clear crystal interface is achieved, and the crystal has a completely developed morphology, takes the shape of a similar sphere, has a high water loss temperature, and has a 1% water loss temperature up to 245 DEG C or greater.

Description

technical field [0001] The invention relates to a production method of aluminum hydroxide, in particular to a production method of electronic-grade high heat-resistant aluminum hydroxide, which belongs to the technical field of aluminum hydroxide preparation. Background technique [0002] In recent years, the technical level of domestic aluminum hydroxide has been greatly improved, and the particle size, oil absorption rate and whiteness of the product have reached a relatively high level. For example, the particle size of micronized aluminum hydroxide could reach 1 ~2 microns, but the particle size distribution is wide, often accompanied by large particles, and the amount of +325 exceeds 0.1%. The oil absorption rate of the product is also above 40ml / 100g. Through the efforts in recent years, the above problems have been solved. However, in the research of aluminum hydroxide technology in China, there are many studies on the dominant indicators such as particle size, oil ab...

Claims

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Application Information

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IPC IPC(8): C01F7/46
CPCC01F7/46C01P2004/61C01P2006/80
Inventor 王科张之强王强姚毅
Owner 中铝山东有限公司
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