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Method of preparing alpha aluminium oxide fine powder by low temperature

A technology of alumina fine powder and alumina, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of not obtaining α-alumina and difficult application, and achieve short roasting time, less organic matter consumption, and low roasting temperature Effect

Inactive Publication Date: 2010-03-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

R.N.Das et al. {J.Am.Ceram.Soc.84[10]2421-2423(2001)} obtained α-alumina by roasting sucrose in a muffle furnace at 600°C for several hours, but L.D.Mitchell{J.Am .Ceram.Soc., 21[22]1773-1775(2002)} repeated the same experiment and did not get α-alumina, and in their experiments the amount of sucrose reached 6 according to the molar ratio of sucrose / aluminum nitrate : 1, even 250: 1, it is difficult to apply in industry

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  • Method of preparing alpha aluminium oxide fine powder by low temperature
  • Method of preparing alpha aluminium oxide fine powder by low temperature
  • Method of preparing alpha aluminium oxide fine powder by low temperature

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Effect test

Embodiment 1

[0017] Add 10 g of pseudo-boehmite to 100 ml of 0.05 g / ml sucrose solution, stir and evaporate to dryness by heating in a water bath at 95°C. The evaporated sample was treated in a muffle furnace at 250°C for 2 hours, and then dehydrated and carbonized at 600°C for 4 hours under a nitrogen atmosphere to obtain a carbon / γ-alumina composite, thermogravimetric-differential thermal (TG-DTA) The results of the analysis showed that the carbon content in the composite was 6.8%. Take 1g of carbon / γ-alumina, put it into a vertical quartz bed reactor, raise the temperature to 800°C under the protection of nitrogen, keep it warm for about 10 minutes, and then feed 300ml / min of oxygen while maintaining the furnace temperature at 800°C After 10 minutes, the reaction was over. from figure 1 It can be seen from the X-ray diffraction characterization results that γ-alumina is completely transformed into α-alumina. Its specific surface area is 15m 2 / g. figure 2 is the temperature change...

Embodiment 2

[0019] Dissolve 5 g of soluble starch in 200 ml of deionized water, add 10 g of pseudo-boehmite, stir and evaporate to dryness by heating in a water bath at 95°C. The evaporated sample was dehydrated and carbonized at 600°C for 4 hours under a nitrogen atmosphere to obtain a carbon / γ-alumina composite. Take 1g of carbon / γ-alumina and put it in a vertical quartz bed reactor. Under the protection of the furnace, the temperature was raised to 800°C, kept for about 10 minutes, and then 300ml / min of oxygen was fed for 10 minutes while maintaining the furnace temperature at 800°C, and the reaction ended. γ-alumina is fully converted to α-alumina with a specific surface area of ​​5m 2 / g.

Embodiment 3

[0021] Add 10 g of γ-alumina to 100 ml of 0.05 g / ml sucrose solution, stir and evaporate to dryness by heating in a water bath at 95°C. The evaporated sample was treated in a muffle furnace at 250°C for 2 hours, and then dehydrated and carbonized at 600°C for 4 hours in a nitrogen atmosphere to obtain a carbon / γ-alumina composite. Take 1g of carbon / γ-alumina, put it into a vertical quartz bed reactor, raise the temperature to 800°C under the protection of nitrogen, keep it warm for about 10 minutes, and then feed 300ml / min of oxygen while maintaining the furnace temperature at 800°C After 10 minutes, the reaction was over. γ-alumina is fully converted to α-alumina with a specific surface area of ​​5m 2 / g.

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Abstract

A low-temp process for preparing fine powder of alpha-aluminum oxide includes such steps as carrying the organic compound difficult to volatilize by the surface of the precursor of aluminum oxide withlarge specific surface area, low-temp dewatering and carbonizing in inertial gas to obtain C / aluminum oxide composition, filling O2, and fast burning C to generate high temp while quickly generatingthe fine powder of alpha-aluminum oxide.

Description

technical field [0001] The invention relates to a method for preparing α-alumina powder at low temperature and short time, and belongs to the field of chemical industry. Background technique [0002] Although the alumina industry has a history of more than 100 years, high-temperature and long-time roasting of aluminum hydroxide and electrofusion are two common methods for industrial production of α-alumina. The α-alumina particles obtained by these two methods are relatively large and need to be further crushed and sieved before they can be further used. It is particularly difficult and costly to prepare ultrafine α-alumina. How to prepare ultra-fine α-alumina powder easily and quickly is a problem that material workers are committed to research. Many methods for preparing ultrafine or nanomaterials have been applied to the preparation of ultrafine α-alumina. The Sol-Gel method can prepare nano-alumina precursors, but generally speaking, it needs to be roasted at 1100 °C f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 谢有畅王培朱月香
Owner PEKING UNIV
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