Process for preparing spherical high purity alumina

A high-purity alumina, spherical technology, applied in the direction of alumina/hydroxide preparation, sustainable building, climate sustainability, etc., can solve the problems of low strength, difficult to control the particle size distribution of spherical particles, etc., to achieve bulk density High, simple manufacturing process, good fluidity

Inactive Publication Date: 2005-06-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Spray granulation is also a very widely used pelletizing technology. The solid-containing suspension is sprayed into the high-temperature zone at high speed, and the particles are agglomerated into spherical particles due to the sudden change of interfacial tension or interfacial energy. Usually, the obtained spherical particles have a particle size of micron Within the range, the strength is low, especially it is difficult to control the size distribution of spherical particles

Method used

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  • Process for preparing spherical high purity alumina
  • Process for preparing spherical high purity alumina
  • Process for preparing spherical high purity alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The pre-prepared 0.1M high-purity aluminum ammonium sulfate solution and 1.0M high-purity ammonium bicarbonate solution flowed into the 10-liter reactor with stirring at a speed of 15ml / min through a peristaltic pump, the stirring speed was 1000rpm, and the temperature was controlled At 25±1°C, the pH of the reaction end point is controlled at 9.0, the slurry stays in the reactor for 7 hours, flows into the aging settling tank, and is left to age at room temperature for 2 hours. After pressure filtration and washing, aluminum ammonium carbonate (AACH ) filter cake (such as Figure 1 Shown), the attached water is 51%, and the filter cake is calcined at 900°C for 1 hour in a high-temperature muffle furnace to obtain γ-Al 2 o 3 powder (such as figure 2 shown). The average particle diameter of the powder is 5.3μm, and the BET specific surface area is 240.5m 2 / g.

Embodiment 2

[0032] The pre-prepared 0.2M high-purity aluminum ammonium sulfate solution and 2.0M high-purity ammonium bicarbonate solution flowed into the 10-liter reactor with stirring at a speed of 20ml / min through a peristaltic pump, the stirring speed was 1500rpm, and the temperature was controlled At 35±1°C, the pH of the reaction end point is controlled at 9.5, the slurry stays in the reactor for 8 hours, flows into the aging settling tank, and is left to age at room temperature for 2 hours, and is filtered and washed to obtain ammonium aluminum carbonate (AACH ) filter cake (such as Figure 3 Shown), the attached water is 48%, and the filter cake is calcined at 900 °C for 1 hour in a high-temperature muffle furnace to obtain γ-Al 2 o 3 powder (such as Figure 4 shown), the average particle diameter of the powder is 7.6μm, and the BET specific surface area is 230.84m 2 / g.

Embodiment 3

[0034] The γ-alumina in Example 1 was calcined at 1200°C for 1 hour to obtain α-Al 2 o 3 powder (such as Figure 5 shown), the average particle diameter of the powder is 4.7μm, and the BET specific surface area is 5.2m 2 / g, bulk density 0.35g / cm 3 .

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Abstract

A method for preparing a spherical alumina of high purity, relates to the preparation of alumina of high purity which is especially suitable to the used in the fields such as compact fluorescent lamp, illuminating material for PDP and LED and transparent ceramics, monocrystal of sapphire, monocrystal of ruby and polishing of paint of car. Its characteristics are that aluminum ammonium sulfate and ammonium hydrogen carbonate are used as the raw material to react into nanometer structure spherical aluminum ammonium carbonate AACH in the container with agitation, and the nanometer structure spherical ª†-Al2O3 and ª‡- Al2O3 are obtained by filtration, washing and roasting. The spherical alumina of high purity has remarkable liquidity, high mechanic strength, infragile and keeping its shape in the course. The invention has high purity, remarkable quality, few requirements for technical condition, without pollution and has low cost.

Description

technical field [0001] A method for preparing spherical high-purity alumina, which involves a process that uses aluminum ammonium sulfate and ammonium bicarbonate as raw materials, and realizes the synthesis of target product particles through chemical reactions and regulation of the radial and axial movement speeds of the fluid in the reactor. A method for preparing spherical high-purity alumina under the control of macroscopic morphology. Background technique [0002] Aluminum oxide is a matrix material for many luminescent materials. Since the luminescent material is very sensitive to trace impurities, the aluminum oxide used to prepare the luminescent material must have a high chemical purity and must also have a good crystal morphology. That is to say, the crystal morphology of alumina is crucial to the preparation of luminescent materials. [0003] At present, the methods used in large-scale production of high-purity alumina mainly include aluminum isopropoxide hydro...

Claims

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Application Information

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IPC IPC(8): C01F7/30
CPCY02B20/00
Inventor 李旺兴李东红沈湘黔王庆伟王舟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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