Process for preparing alpha-alumina powder for ceramic film support

A ceramic membrane support and preparation technology, which is applied in the field of α-alumina powder preparation technology for ceramic membrane supports, can solve the problems of small alumina content in large grains, no sintering activity, and failure to reach the original crystal, etc., to achieve Stable product quality, high α phase conversion rate, and large α primary crystal effect

Active Publication Date: 2009-01-07
HENAN CHANGXING IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the domestic α-alumina powder production process is not mature enough, and the raw material processing is not sufficient enough, the ingredients are unreasonable, so the domestically produced α-alumina powder cannot reach the original crystal (that is, the primary grain d50≥15μm), and the grain uniformity, The fineness does not meet the requirements, and the crystal shape of α-alumina powder cannot be approximately spherical, and it has no sintering activity. The content of large-grain alumina (greater than 15 μm) in the finished product of one-time firing is also small. α-alumina powder for ceramic membrane support mainly relies on imports and abrasive products as substitutes

Method used

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  • Process for preparing alpha-alumina powder for ceramic film support
  • Process for preparing alpha-alumina powder for ceramic film support
  • Process for preparing alpha-alumina powder for ceramic film support

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Experimental program
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Embodiment 1

[0027] The preparation process of the α-alumina powder used for the ceramic membrane support body provided in this embodiment includes the following steps (such as figure 1 shown):

[0028] 1) Sieving and removing impurities: the alumina raw material (wherein Al 2 o 3 ≥98.60%, SiO 2 ≤0.02%, Fe 2 o 3 ≤0.02%, Na 2 O≤0.50%) sieve and remove impurities;

[0029] 2) Mixing: add a composite mineralizer to the sieved and removed alumina and mix evenly to form an alumina mixture. The composite mineralizer includes boric acid, ammonium chloride, calcium fluoride, and aluminum fluoride. The weight ratios in the alumina mixture are 5%, 3%, 3%, and 3%, respectively. ;

[0030] 3) High-temperature phase inversion: put the alumina mixture in a high-temperature furnace for high-temperature calcination phase inversion, the phase inversion temperature is 1550°C, and the holding time is 12h;

[0031] 4) Grinding: After cooling the product obtained in 3), add corundum balls to a ball m...

Embodiment 2

[0035] The preparation process of the α-alumina powder for the ceramic membrane support body provided in this embodiment includes the following steps:

[0036] 1) Sieving and removing impurities: the alumina raw material (wherein Al 2 o 3 ≥98.60%, SiO 2 ≤0.02%, Fe 2 o 3 ≤0.02%, Na 2 O≤0.50%) sieve and remove impurities;

[0037] 2) Mixing: add a composite mineralizer to the screened and removed alumina and mix evenly to form an alumina mixture. The composite mineralizer includes boric acid, ammonium chloride, fluorite, and aluminum fluoride. Each component is oxidized The weight ratios in the aluminum mixture are 1%, 0.5%, 0.5%, and 7% respectively;

[0038] 3) High-temperature phase inversion: put the alumina mixture in a high-temperature furnace for high-temperature calcination phase inversion, the phase inversion temperature is 1500°C, and the holding time is 15h;

[0039] 4) Grinding: After cooling the product obtained in 3), add corundum balls to a ball mill for gr...

Embodiment 3

[0043] The preparation process of the α-alumina powder for the ceramic membrane support body provided in this embodiment includes the following steps:

[0044] 1) Sieving and removing impurities: the alumina raw material (wherein Al 2 o 3 ≥98.60%, SiO 2 ≤0.02%, Fe 2 o 3 ≤0.02%, Na 2 O≤0.50%) sieve and remove impurities;

[0045] 2) Mixing: add a composite mineralizer to the sieved and removed alumina and mix evenly to form an alumina mixture. The composite mineralizer includes boric acid, ammonium chloride, calcium fluoride, and aluminum fluoride. The proportion by weight in the alumina mixture is 7%, 7%, 7%, 0.5% respectively;

[0046] 3) High-temperature phase inversion: put the alumina mixture in a high-temperature furnace for high-temperature calcination phase inversion, the phase inversion temperature is 1700°C, and the holding time is 2h;

[0047] 4) Grinding: After cooling the product obtained in 3), add corundum balls to a ball mill for grinding according to raw...

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Abstract

The invention discloses a process for preparing ceramic membrane support used Alpha-powdered alumina. The manufacturing process is that: after alumina is screened and decontaminated, a compound mineralizer is added to and mixed with alumina, thus preparing alumina mixture; the alumina mixture is put in a high temperature furnace for calcining and phase inversion at 1500 to 1700 DEG C; the mixtureis kept at the temperature for two to fifteen hours; after the mixture is cooled, corundum balls of one to three times of the mixture is added to a ball mill for milling; a finishing agent is added for surface treatment; the obtained product is washed with water and graded before the product is dried at 100 DEG C. The crystal of Alpha alumina is large; the true density of crystal is large; inversion percent of Alpha phase is high; the purity is high; the Alpha-powdered alumina has sintering activity; and the crystal is nearly spherical.

Description

technical field [0001] The invention relates to a preparation process of alumina powder, in particular to a preparation process of α-alumina powder for a ceramic membrane support body. Background technique [0002] α-alumina powder for ceramic membrane support is the main basic raw material for solid-liquid separation and gas separation in food, beverage, medicine, petroleum, chemical, environmental protection and other industries. Alumina ceramic membrane is based on α-alumina powder The support body is made by impregnating nanometer or submicron α-alumina powder into a film and calcining at high temperature. It is an alumina ceramic microfiltration membrane and ultramicrofiltration membrane product with a certain pore size and porosity. The ceramic membrane is suitable for alumina powder. Its physical and chemical properties are extremely demanding, such as grain size, crystal shape, crystal surface properties, particle size distribution and chemical purity. Because the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/626
Inventor 孙志昂张子亮
Owner HENAN CHANGXING IND CO LTD
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