Method for preparing hollow aluminum oxide microspheres

A technology of alumina hollow and hollow microspheres, applied in the field of materials, can solve problems such as complex processes, and achieve the effects of simple and reliable process, high yield and low cost

Inactive Publication Date: 2010-11-17
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0003] Chinese patent 200910059651.7 "Preparation method of corundum hollow microspheres" di

Method used

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  • Method for preparing hollow aluminum oxide microspheres
  • Method for preparing hollow aluminum oxide microspheres
  • Method for preparing hollow aluminum oxide microspheres

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Embodiment Construction

[0017] see figure 1 .

[0018] The present invention uses ammonium aluminum sulfate [(NH 4 ) 2 al 2 (SO 4 ) 4 24 hours 2 O] as raw material, the main preparation equipment is mill, sprayer, vacuum sintering furnace and so on. The specific process is to first heat the vacuum sintering furnace to 1000°C-1200°C and keep the pressure in the furnace at a negative pressure (1kPa-5kPa), then place the aluminum ammonium sulfate powder in the sprayer, atomize and spray it into the vacuum sintering furnace through the sprayer, The atomized aluminum ammonium sulfate is rapidly decomposed in the vacuum sintering furnace to discharge gas, and the volume expansion is calcined at high temperature to form alumina hollow microspheres.

[0019] The specific steps are:

[0020] a) Analytical pure aluminum ammonium sulfate [(NH 4 ) 2 al 2 (SO 4 ) 4 24 hours 2 O] be placed in the pulverizer and grind finely, and cross 800 mesh sieves for subsequent use;

[0021] b) will figure 1 Th...

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Abstract

The invention discloses a method for preparing hollow aluminum oxide microspheres, which relates to material technology. The method comprises the following steps of: a) placing analytically pure aluminum ammonium sulfate [(NH4)2Al2(SO4)4.24H2O] into a flour mill for milling, and sieving the milled aluminum ammonium sulfate with a sieve of 800 meshes for later use; b) preheating a vacuum sintering furnace; c) filling the aluminum ammonium sulfate powder obtained by the milling into an atomizer for atomization; d) blowing the atomized aluminum ammonium sulfate powder into the vacuum sintering furnace by using compressed air; e) maintaining the temperature in the vacuum sintering furnace to be over 1,000 DEG C, keeping the air pressure in the vacuum sintering furnace lower than the atmospheric pressure, vigorously decomposing the aluminum ammonium sulfate powder to form porous aluminum oxide powder which falls under the action of gravity, exhausting produced gases by an exhaust pump, and arranging a filter screen of 12,500 meshes at the front end of an inlet pipe of the exhaust pump to prevent the solid powder from being sucked in; and f) keeping the temperature for 1 hour when the temperature in the vacuum sintering furnace is 1,000 DEG C so as to sinter the porous powder into hollow ceramic microspheres, stopping heating, injecting air into the vacuum sintering furnace and obtaining the hollow aluminum oxide microspheres when the temperature is reduced to the room temperature. The method of the invention has the advantages of simple and reliable process, low cost and high yield.

Description

technical field [0001] The present invention relates to materials technology. Background technique [0002] Alumina hollow sphere is a new type of high-temperature heat insulation material, which is melted and blown from industrial alumina in an electric furnace, and its crystal form is a-Al2O3 microcrystal. With alumina hollow spheres as the main body, it can be made into products of various shapes. The maximum service temperature is 1800°C. The product has high mechanical strength, which is several times that of general light products, and its volume density is only half of that of corundum products. It has been widely used in high-temperature and ultra-high-temperature furnaces such as gasifiers in the petrochemical industry, reaction furnaces in the carbon black industry, and induction furnaces in the metallurgical industry, and has achieved very satisfactory energy-saving effects. Alumina hollow spheres and their products are lightweight refractory materials with high ...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 刘敬松李惠琴余洪滔
Owner SOUTHWEAT UNIV OF SCI & TECH
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