High-purity aluminum oxide with small primary crystal and production method of high-purity aluminum oxide

A technology of high-purity alumina and production method, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of increasing pollution, large size of primary crystal, and increasing production cost.

Active Publication Date: 2014-06-11
晶鑫晶体(内蒙古)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the methods for producing high-purity alumina on the market include aluminum ammonium sulfate method, choline dissolution method, and high-purity aluminum hydrolysis method. ,like figure 2 As shown; or the size of the original crystal is relatively large, generally greater than 0.5 μm. If the market requires powders with small particle sizes, ball milling or jet milling is required to crush them to the corresponding particle size, thereby increasing the possibility of pollution and improving the quality of multiple processes. cost of production

Method used

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  • High-purity aluminum oxide with small primary crystal and production method of high-purity aluminum oxide
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Embodiment 1

[0014] The specific implementation method of producing small primary crystal high-purity alumina described in the present invention is as follows:

[0015] 1. Liquefy industrial aluminum hydroxide and liquid caustic soda at a high temperature of 110°C to produce sodium metaaluminate solution. Al 2 o 3 The concentration is controlled at 120g / L. At the same time of liquefaction, one or both of activated quicklime or slaked lime is added, and the amount added is 200 times the silicon content.

[0016] 2. After the liquefaction is complete, add industrial aluminum hydroxide again to fully absorb and precipitate impurities. After the addition of aluminum hydroxide was completed, it was stirred under compressed air for 10 min.

[0017] 3. After the stirring is completed, carry out 2 cycles of filtration through a plate and frame filter press.

[0018] 4. Obtain the sodium metaaluminate semen after filtration, and first remove the Al 2 o 3 Dilute the concentration to 50g / L, co...

Embodiment 2

[0022] A specific implementation method for producing small primary crystal high-purity alumina is as follows:

[0023] 1. Liquefy industrial aluminum hydroxide and liquid caustic soda at a high temperature of 150°C to produce sodium metaaluminate solution. Al 2 o 3 The concentration is controlled at 200g / L. At the same time of liquefaction, one or both of activated quicklime or slaked lime is added, and the amount added is 500 times the silicon content.

[0024] 2. After the liquefaction is complete, add industrial aluminum hydroxide again to fully absorb and precipitate impurities. After the addition of aluminum hydroxide was completed, it was stirred under compressed air for 50 min.

[0025] 3. After the stirring is completed, carry out 5 cycles of filtration through a plate and frame filter press.

[0026] 4. Obtain the sodium metaaluminate semen after filtration, and first remove the Al 2 o 3 Dilute the concentration to 120g / L, control the temperature at 90°C, add ...

Embodiment 3

[0030] A specific implementation method for producing small primary crystal high-purity alumina is as follows:

[0031] 1. Liquefy industrial aluminum hydroxide and liquid caustic soda at a high temperature of 130°C to produce sodium metaaluminate solution. Al 2 o 3 The concentration is controlled at 160g / L. One or both of active quicklime or slaked lime is added at the same time of liquefaction, and the amount added is 350 times the silicon content.

[0032] 2. After the liquefaction is complete, add quantitative industrial aluminum hydroxide again to fully absorb and precipitate impurities. After adding aluminum hydroxide, stir under compressed air for 30~40min.

[0033] 3. After the stirring is completed, carry out 5 cycles of filtration through a plate and frame filter press.

[0034] 4. Obtain the sodium metaaluminate semen after filtration, and first remove the Al 2 o 3 Dilute the concentration to 80~90g / L, control the temperature at 75°C, add one or both of salic...

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Abstract

The invention discloses a high-purity aluminum oxide with a small primary crystal and a production method of the high-purity aluminum oxide, belonging to the technical field of aluminum oxide preparation. The high-purity aluminum oxide with the small primary crystal is characterized in that a primary crystal of aluminum oxide has the average diameter of 0.1-0.3 mum and the grain size D50 of 0.5-3.0mum, and the aluminum oxide has the purity of 99.997-99.999%. A production method of the high-purity aluminum oxide comprises the following process steps of liquefying, removing impurities, filtering, crystallizing, cleaning, drying, changing phases and the like and is characterized in that a crystallizing process comprises the following steps of: diluting fine sodium meta-aluminate liquid obtained after filtering, adding salicylic acid and sodium dodecyl benzene sulfonate, carbonating in a multi-stage carbon dioxide introducing way, controlling the decomposition rate to be up to 90-99% to generate slurry. According to the invention, the direct production of the high-purity aluminum oxide with the small primary crystal is realized, the process of ball-milling or jet-milling pulverization is omitted, and the pollution and the cost are reduced. Physical indexes such as grain size distribution, apparent density, specific surface area and the like can meet most of special requirements in the current market.

Description

technical field [0001] The invention belongs to the technical field of alumina preparation, and relates to a small primary crystal high-purity alumina and a production method thereof. Background technique [0002] At present, the methods for producing high-purity alumina on the market include aluminum ammonium sulfate method, choline dissolution method, and high-purity aluminum hydrolysis method. ,Such as figure 2 As shown; or the size of the original crystal is relatively large, generally greater than 0.5 μm. If the market requires powders with small particle sizes, ball milling or jet milling is required to crush them to the corresponding particle size, thereby increasing the possibility of pollution and improving the quality of multiple processes. production cost. With the current high-purity alumina market expanding, many application fields have higher and higher requirements for high-purity alumina particle size and other physical indicators, and most of the physical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 宋军
Owner 晶鑫晶体(内蒙古)科技有限公司
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