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Method for producing alumina

A technology of alumina and aluminum hydroxide, which is applied in the fields of aluminum hydroxide preparation, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of low volumetric efficiency and low bulk density of dry powder aluminum hydroxide, etc. achieve high volumetric efficiency

Inactive Publication Date: 2010-06-30
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the bulk density of dry powdered aluminum hydroxide prepared by the aluminum alkoxide method is low, which in turn makes the volumetric efficiency low
Therefore, the aluminum alkoxide method may not necessarily be regarded as an industrially advantageous method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, aluminum isopropoxide as an aluminum alkoxide is hydrolyzed with water to form an aluminum hydroxide slurry, and the slurry is dried to obtain a first dry powdered aluminum hydroxide. The bulk density of the first dry powder aluminum hydroxide is 0.12g / cm 3 , BET specific surface area is 294m 2 / g, and the average secondary particle size is 11.0 μm.

[0047] Then, using a continuous jet mixer ("Mw-F300S" manufactured by Funken Powtechs Inc.), 100 parts by weight of the first dry powdery aluminum hydroxide was mixed with 58 parts by weight of water as an aqueous medium to obtain a wet powdery aluminum hydroxide aluminum.

[0048] Wet powdery aluminum hydroxide was charged into a 13-liter container made of SUS equipped with stirring blades, and dried while stirring the powder to evaporate water. Thus, the second dry powdery aluminum hydroxide was obtained. The bulk density of the second dry powdered aluminum hydroxide is 0.45g / cm 3 , BET specific surface area ...

Embodiment 2

[0052] First, the same aluminum alkoxide as used in Example 1 was hydrolyzed to obtain the first dry powdered aluminum hydroxide having the same physical properties as those obtained in Example 1. Then, the second dry powdery aluminum hydroxide was prepared in the same manner as in Example 1, except that a continuous jet mixer was used to mix 100 parts by weight of the first dry powdery aluminum hydroxide with 82 parts by weight as an aqueous medium of water. The bulk density of the second dry powdered aluminum hydroxide obtained is 0.74g / cm 3 , BET specific surface area is 145m 2 / g, the average secondary particle size is 80.9 μm.

[0053] Thereafter, the second dry powdery aluminum hydroxide was calcined in the same manner as in Example 1, thereby obtaining α-alumina. The resulting α-alumina is agglomerated such that it has a BET specific surface area of ​​3.2m 2 / g, the average secondary particle size is 132μm. Therefore, the α-alumina aggregates were pulverized in the...

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Abstract

A method for producing alumina comprising the steps of mixing an aqueous medium in an amount of 20 parts by weight or more and 300 parts by weight or less with 100 parts by weight of a first dry powdery aluminum hydroxide prepared by an aluminum alkoxide method to give a wet powdery aluminum hydroxide; drying the wet powdery aluminum hydroxide by an agitation drying system to give a second dry powdery aluminum hydroxide; and calcining the second dry powdery aluminum hydroxide to give alumina having a high bulk density.

Description

technical field [0001] The present invention relates to a method of producing alumina. Background technique [0002] Alumina is widely used in industry as a raw material for ceramic materials, etc. In particular, powdered alumina is used as a raw material for high-density sintered bodies, single crystal sapphire, abrasives, and various fillers. As an example of a production method of such alumina, known methods include calcining dry powdery aluminum hydroxide prepared by an aluminum alkoxide method without treating the dry powdery aluminum hydroxide before calcining. In a typical manufacturing method, in order to prevent powder scattering, powdery aluminum hydroxide is filled in a calcining container such as a sheath (sheath), and then calcined (see JP-A-8-301616, especially No. [0002] and paragraph [0003]). [0003] However, dry powdered aluminum hydroxide prepared by the aluminum alkoxide method has a low bulk density, which in turn leads to low volumetric efficiency. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44C01F7/441
CPCC01P2006/12C01F7/441C01P2004/62C01F7/44C01P2006/11C01F7/36C01P2004/61C01F7/02B22F3/10
Inventor 藤田纪辉藤原进治
Owner SUMITOMO CHEM CO LTD
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