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A kind of preparation method of lightweight porous aluminum phosphate-mullite ceramic ball

A kind of technology of mullite and aluminum phosphate

Inactive Publication Date: 2018-06-01
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: molding is more difficult, and in the process of organic matter burning off, it is easy to cause ceramic cracking or damage, reducing the yield of products; polluted environment

Method used

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  • A kind of preparation method of lightweight porous aluminum phosphate-mullite ceramic ball

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Experimental program
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Embodiment 1

[0011] Dry-mix mullite powder, alumina powder, aluminum dihydrogen phosphate powder, and frit powder at a mass ratio of 2:1:3.11:0.03; wherein, the frit contains 50 wt% lithium oxide, 30 wt % of sodium oxide and 20 wt% of silicon dioxide; the average particle size of control mullite powder and oxide powder is 0.6 micron, the average particle size of aluminum dihydrogen phosphate powder is 0.5 micron, and the average particle size of frit powder is 0.7 Micron; adding a polyvinyl alcohol solution with a concentration of 8 wt% as a binding agent, the addition of the binding agent is 5% of the total mass of the billet; then granulating and dry pressing with a pressure of 10MPa to obtain a cylindrical green body; After drying the green body at 70°C for 5 hours, put the green body into an alumina crucible with a hemispherical inner bottom, heat it up to 150°C at a rate of 5°C / min in the atmosphere and keep it warm for 2 hours, then heat it at 10°C Heat up to 380°C at a speed of ℃ / mi...

Embodiment 2

[0013] Mullite powder, alumina powder, aluminum dihydrogen phosphate powder, and frit powder are dry-blended according to a mass ratio of 2:1:3.11:0.03; wherein, the frit contains 50 wt% lithium oxide, 30 wt% Sodium oxide and 20 wt% silicon dioxide; the average particle size of the control mullite powder and oxide powder is 0.6 microns, the average particle size of the aluminum dihydrogen phosphate powder is 0.5 microns, and the average particle size of the frit powder is 0.7 microns Adding a polyvinyl alcohol solution with a concentration of 8 wt% as a binding agent, the addition of the binding agent is 5% of the total mass of the billet; then granulation, dry pressing with 20MPa pressure, to obtain a cylindrical green body; After drying the green body at 70°C for 5 hours, put the green body into an alumina crucible with a hemispherical inner bottom, heat it up to 150°C at a rate of 5°C / min in the atmosphere and keep it warm for 2 hours, then heat it at 15°C Heating up to 380...

Embodiment 3

[0015] Mullite powder, alumina powder, aluminum dihydrogen phosphate powder, and frit powder are dry-blended according to a mass ratio of 2:1:3.11:0.03; wherein, the frit contains 50 wt% lithium oxide, 30 wt% Sodium oxide and 20 wt% silicon dioxide; the average particle size of control mullite powder and oxide powder is 0.6 micron, the average particle size of aluminum dihydrogen phosphate powder is 0.5 micron, and the average particle size of frit powder is 0.7 Micron; add a polyvinyl alcohol solution with a concentration of 8 wt% as a binder, and the amount of binder added is 5% of the total mass of the billet; then granulate and dry press with a pressure of 25 MPa to obtain a cylindrical billet ; After drying the green body at 70°C for 5 hours, put the green body into an alumina crucible with a hemispherical inner bottom, heat it up to 150°C at a speed of 5°C / min and keep it warm for 2 hours in the atmosphere, and then Heating at a speed of 20 ℃ / min to 380 ℃ and holding for...

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Abstract

A method for preparing lightweight porous aluminum phosphate-mullite ceramic balls, characterized by adopting the following steps: (1) drying mullite powder, alumina powder, aluminum dihydrogen phosphate powder, and frit powder in proportion (2) Granulation and molding to obtain cylindrical blanks; (3) After drying the blanks at 70°C for 5 hours, the blanks were placed in an alumina crucible with a hemispherical inner bottom, and the blanks were placed in an atmospheric atmosphere. Heat up to 150°C at a rate of 5°C / min and hold for 2 hours, then heat up to 380°C at a rate of 10-20°C / min and hold for 1 hour, then heat up to 680°C at a rate of 1°C / min ℃ and kept for 2 hours, finally heated to 1150 ℃ at a speed of 5 ℃ / min and kept for 2 hours, and then cooled to room temperature naturally to obtain light porous aluminum phosphate-mullite ceramic balls.

Description

technical field [0001] The invention provides a method for preparing lightweight porous aluminum phosphate-mullite ceramic balls, belonging to the technical field of preparation of special ceramic materials. Background technique [0002] Porous aluminum phosphate (AlPO 4 )—mullite (3Al 2 o 3 . 2SiO2 2 ) Ceramic balls are widely used in industrial production, and can be used as catalyst carriers, chemical fillers, heat preservation and refractory materials, etc. When used as a photocatalyst carrier and other liquid-phase reaction catalyst carrier, as well as an adsorbent for toxic substances in water, in order to ensure high catalytic effect and (or) adsorption efficiency, porous ceramic balls are often required to be in a suspended state in water, which is There is a need to prepare a lightweight porous ceramic ball. At present, at home and abroad, spheres made of easily burnable organic matter are mainly used as the "core" of the spherical green body, and then the sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/185C04B35/63C04B35/634
CPCC04B35/185C04B35/6303C04B35/63416C04B38/02C04B2235/3201C04B2235/3203C04B2235/3217C04B2235/3418C04B2235/5445C04B38/0067C04B38/0074
Inventor 白佳海高杰刘俊成
Owner SHANDONG UNIV OF TECH