Preparation method for nanoscale alumina powder

An alumina powder and nano-scale technology is applied in the field of preparation of nano-scale alumina powder, which can solve the problem of high cost and achieve the effects of less impurity content, large pore volume and reasonable pore size distribution.

Inactive Publication Date: 2013-01-02
YINGKOU HENGDA INDAL
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Problems solved by technology

The preparation methods of nano-alumina tend to be diversified. At present, the powder prepared by the gas-phase method commonly used in China has good characteristics, but the cost is too high; the alkoxide hydrolysis method is an ideal method. This method prepares nano-alumina under mild conditions. , the product has high purity and uniform particle size, which can easily produce alumina with high purity and small particle size

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  • Preparation method for nanoscale alumina powder
  • Preparation method for nanoscale alumina powder

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Embodiment 1

[0034] Experimental material

[0035] The selection of raw materials (such as type, purity, particle size, etc.) directly determines the gelling effect and the powder characteristics of nano-powders. Alcohol aluminum reaction preparation process conditions: 80-100 mesh aluminum powder 54g, catalyst / aluminum powder mass ratio=0.05, aluminum powder / n-hexanol molar ratio=1:4, reaction temperature: 160°C, operating pressure: ≤0.1 Mpa, reaction time: 2 hours, the reaction was carried out to obtain 616g of the intermediate product aluminum n-hexoxide.

[0036] Aluminum alkoxide compound hydrolysis reaction prepares nanoscale alumina powder process condition: the mol ratio of 616g n-hexyl aluminum and deionized water is 1:3, adds the surfactant polyethylene glycol 400 of 1% of n-hexyl aluminum weight, reaction temperature : 70°C, operating pressure: ≤0.1Mpa, pH value: 7.5, reaction time: 3 hours, after hydrolysis, distillation, and separation, 148g of hydrated alumina was obtained. ...

Embodiment 2

[0039] Alcohol aluminum reaction preparation process conditions: 100-200 mesh aluminum powder 54g, catalyst / aluminum powder mass ratio=0.03, aluminum powder / n-hexanol molar ratio=1:5, reaction temperature: 160°C, operating pressure: ≤0.15 Mpa, reaction time: 3 hours, carry out reaction and obtain intermediate product aluminum n-hexoxide 640g.

[0040] Aluminum alkoxide compound hydrolysis reaction prepares nanoscale alumina powder Process conditions: the mol ratio of 640g aluminum n-hexoxide and deionized water is 1:3, add 0.5% surfactant polyethylene glycol 600 of aluminum n-hexoxide weight, reaction temperature: 80°C, operating pressure: ≤0.1Mpa, pH value: 7, reaction time: 4 hours, after distillation, separation, and hydrolysis, 156g of hydrated alumina was obtained.

[0041] Roast 100g of hydrated alumina in a muffle furnace at a temperature of 800°C for 2-3 hours, and gradually cool down to room temperature in the furnace to obtain 65g of γ-alumina.

[0042] Roast 56g of...

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Abstract

The invention relates to a preparation method for nanoscale alumina powder. The method includes allowing the reaction between aluminum powder and solvent n-hexanol to prepare an aluminum alkoxide compound, hydrolyzing, distilling, separating, and roasting to prepare nanoscale alumina powder product. The invention has no need for catalyst removal, has no need for large amount of water to wash away the impurities in the material, reduces the discharge of wastewater, reduces pollution and saves the production cost; in the production process, the used alcohol can be recycled (with recovery rate at 90%), to greatly reduce the production cost; and the product has low impurity content, large pore volume, large specific surface, and reasonable pore size distribution, and can be used as an industrial catalyst carrier.

Description

technical field [0001] The invention belongs to a preparation method of oxides, in particular to a preparation method of nano-scale alumina powder. Background technique [0002] With the continuous development of nanotechnology, the requirements for the ultra-fineness and uniformity of new nanomaterials will increase day by day. Nano-alumina not only has the characteristics of high melting point, high refractoriness, good high-temperature mechanical properties, good electrical insulation, strong acid and alkali corrosion resistance and high hardness of ordinary alumina, but also has a larger specific surface than other substances and is cheaper and easier to obtain. It also has the unique properties of many nanomaterials such as quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect. Therefore, nano-alumina is widely used in many fields. [0003] With the development of science and technology, the requirements for the purity and part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y40/00
Inventor 高长龙潘学武
Owner YINGKOU HENGDA INDAL
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