Preparation method of nanometer grade spherical aluminum oxide

A spherical alumina, nanoscale technology, applied in the preparation of aluminum hydroxide, chemical instruments and methods, nanotechnology, etc., to achieve good application prospects, small particle size, and regular morphology.

Active Publication Date: 2018-09-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The spherical alumina powder disclosed in this patent is carried out in an alkaline system, and the obtained spherical alumina powder is micron-sized, and further improvement is still needed

Method used

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  • Preparation method of nanometer grade spherical aluminum oxide
  • Preparation method of nanometer grade spherical aluminum oxide
  • Preparation method of nanometer grade spherical aluminum oxide

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Embodiment 1

[0044] The preparation method of the nanoscale spherical alumina of the present embodiment comprises the following steps:

[0045] 1) Analytical pure Al(NO 3 ) 3 9H 2 O was added to deionized water and stirred with a glass rod to dissolve it to obtain Al 3+ Concentration is the transparent solution A of 1.2mol / L, standby; The analytically pure C 6 h 5 (NH 4 )3 o 7 2H 2 Add O into deionized water, stir it with a glass rod to dissolve it, and prepare a transparent solution B with a concentration of 0.3mol / L for subsequent use;

[0046] 2) Add a certain amount of ammonium citrate solution B to solution A, so that Al 3+ The molar ratio to citrate ions is 4:1, stir well with a glass rod to obtain solution C; add a certain amount of absolute ethanol to solution C, so that the volume ratio of solution C to ethanol is 1:1, and use glass The stick is fully stirred evenly to obtain solution D;

[0047] 3) Pour the solution D into the liner of the hydrothermal reaction kettle m...

Embodiment 2

[0051] The preparation method of the nanoscale spherical alumina particles of the present embodiment comprises the following steps:

[0052] 1) Analytical pure Al(NO 3 ) 3 9H 2 O was added to deionized water and stirred with a glass rod to dissolve it to obtain Al 3+ Concentration is the transparent solution A of 1.2mol / L, standby; The analytically pure C 6 h 5 (NH 4 ) 3 o 7 2H 2 Add O into deionized water, stir it with a glass rod to dissolve it, and prepare a transparent solution B with a concentration of 0.4mol / L for subsequent use;

[0053] 2) Add a certain amount of ammonium citrate solution B to solution A, so that Al 3+ The molar ratio to citrate ions is 3:1, stir well with a glass rod to obtain solution C; add a certain amount of absolute ethanol to solution C, so that the volume ratio of solution C to ethanol is 1:1, and use glass The stick is fully stirred evenly to obtain solution D;

[0054] 3) Pour the solution D into the liner of the hydrothermal react...

Embodiment 3

[0057] The preparation method of the nanoscale spherical alumina particles of the present embodiment comprises the following steps:

[0058] 1) Analytical pure Al(NO 3 ) 3 9H 2 O was added to deionized water and stirred with a glass rod to dissolve it to obtain Al 3+ Concentration is the transparent solution A of 1.4mol / L, standby; The analytically pure C 6 h 5 (NH 4 ) 3 o 7 2H 2 Add O into deionized water, stir it with a glass rod to dissolve it, and prepare a transparent solution B with a concentration of 0.35mol / L for subsequent use;

[0059] 2) Add a certain amount of ammonium citrate solution B to solution A, so that Al 3+ The molar ratio to citrate ions is 4:1, stir well with a glass rod to obtain solution C; add a certain amount of absolute ethanol to solution C, so that the volume ratio of solution C to ethanol is 1:1, and use glass The stick is fully stirred evenly to obtain solution D;

[0060] 3) Pour the solution D into the liner of the hydrothermal reac...

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Abstract

The invention relates to a preparation method of nanometer grade spherical aluminum oxide, and belongs to the technical field of aluminum oxide processing. The preparation method of the nanometer grade spherical aluminum oxide comprises the following steps of (1) uniformly mixing soluble aluminum salt, ammonium citrate, water and ethanol; then, performing solvothermal reaction at 150 to 200 DEG Cfor 15 to 24h; next, performing cooling and filtering to obtain a product; drying the product to obtain a precursor; (2) performing heat insulation on the precursor obtained in the step (1) at 400 to600 DEG C for 2 to 7 hours to obtain a finished product. The preparation method of the nanometer grade spherical aluminum oxide breaks through the limitation of the spherical aluminum oxide preparation from basic substances such as urea, ammonium hydroxide and sodium hydroxide in the prior art. The aluminum oxide obtained by the method has a regular appearance, does not have the obvious agglomeration, has a fine and small particle dimension, reaches the nanometer grade and has good application prospects.

Description

technical field [0001] The invention relates to a method for preparing nanoscale spherical alumina, which belongs to the technical field of alumina processing. Background technique [0002] Alumina (Al 2 o 3 ) is an amphoteric oxide with excellent properties such as high strength, high hardness, high wear resistance, high stability, good corrosion resistance and ionic conductivity, so it is widely used in the fields of electronics, refractories, abrasives and aerospace Has been widely used. Among them, spherical alumina has regular morphology, small specific surface area, large bulk density and good fluidity, so it is widely used to make polishing materials and catalysts. [0003] Nano-scale spherical alumina is widely used in traditional industries (light industry, chemical industry, building materials, etc.) and high-tech fields such as new materials, microelectronics, and aerospace industries, and its application prospects are very broad. For example, the use of nano-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34C01F7/44B82Y30/00
CPCB82Y30/00C01F7/34C01F7/441C01P2002/72C01P2004/03C01P2004/32
Inventor 魏世忠杨颜萍潘昆明徐流杰张程陈冲王长记赵阳李继文周玉成王喜然李秀青
Owner HENAN UNIV OF SCI & TECH
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