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Preparation method of composite silicon carbide ceramic filter membrane material

A technology of ceramic filter membrane and composite silicon carbide, which is applied in the field of high-temperature dust removal gas, can solve the problems of long time consumption, complicated preparation process, and high energy consumption, and achieve the effects of high efficiency, simple process, and low energy consumption

Inactive Publication Date: 2012-10-10
HAINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Porous ceramic filter membranes are generally prepared by slurry coating methods, such as pulling method, spray coating method and tape casting method, etc. When coating on the surface of ceramic substrate, there are three main defects: 1. Due to the large pore size of the substrate, the filter membrane slurry will enter the air of the substrate and affect its filtering effect; 2. Due to the large number of substrates and The surface is uneven and cannot provide all the smooth and flat surfaces that are conducive to coating, resulting in an uneven and flat structure of the coated film
3. Porous ceramic filter membranes are generally sintered after the porous ceramic substrate is pressed and formed, then coated on the substrate, and finally sintered; the preparation process is complex, time-consuming and energy-consuming

Method used

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  • Preparation method of composite silicon carbide ceramic filter membrane material
  • Preparation method of composite silicon carbide ceramic filter membrane material

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Experimental program
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Effect test

Embodiment 1

[0026] 1. According to the mass fraction of 65wt% potassium feldspar, 12wt% kaolin, and 23wt% quartz, the potassium feldspar, kaolin and quartz are mixed and ball-milled until the particle size is 0.1-3 μm to obtain a ceramic binder.

[0027] 2. Weigh 10g of silicon carbide particles, 1.11g of ceramic binder, 1.33g of activated carbon (particle size 3μm) and 1.5g of carboxymethyl cellulose (CMC) solution with a mass fraction of 2wt%; first add silicon carbide particles CMC solution, and stir evenly; Then ceramic binder and activated carbon are added respectively, and after stirring until uniform, weigh its 4g mixture and dry-press molding, the pressure is about 26MPa, obtains the SiC porous ceramic support green body, The diameter is 20mm and the thickness is about 5mm. The average particle size of the silicon carbide particles is 300 μm.

[0028] 3. Scatter and spread a layer of activated carbon powder (particle size: 3μm.) on the surface of the support body, and dry press i...

Embodiment 2

[0034] 1. Same as step (1) in Embodiment 1.

[0035] 2. Weigh 10g of silicon carbide particles, 1.85g of ceramic binder, 2.13g of activated carbon (particle size 4μm) and 1.9g of carboxymethyl cellulose (CMC) solution with a mass fraction of 3wt%; first add silicon carbide particles CMC solution, and stir evenly; Then ceramic binder and activated carbon are added respectively, and after stirring until uniform, weigh its 4g mixture and dry-press molding, the pressure is about 26MPa, obtains the SiC porous ceramic support green body, The diameter is 20mm and the thickness is about 5mm. The average particle size of the silicon carbide particles is 250 μm.

[0036] 3. Scatter and spread a layer of graphite powder (particle size: 0.7μm.) on the surface of the support body, and dry press it with a pressure of about 4MPa.

[0037] 4. Mix 1g of mullite fiber and 0.5g of ceramic binder, and stir evenly to obtain a ceramic fiber mixture. On the upper surface of the active carbon laye...

Embodiment 3

[0041] 1. Same as step (1) in Embodiment 1.

[0042] 2. Weigh 10g of silicon carbide particles, 2.68g of ceramic binder, 3.45g of activated carbon (particle size 3μm) and 2.5g of carboxymethyl cellulose (CMC) solution with a mass fraction of 2wt%; first add silicon carbide particles CMC solution, and stir evenly; Then ceramic binder and activated carbon are added respectively, and after stirring until uniform, weigh its 4g mixture and dry-press molding, the pressure is about 26MPa, obtains the SiC porous ceramic support green body, The diameter is 20mm and the thickness is about 5mm. The average particle size of the silicon carbide particles is 220 μm.

[0043] 3. Scatter and spread a layer of activated carbon powder (particle size: 3μm.) on the surface of the support body, and dry press it with a pressure of about 3MPa.

[0044] 4. Mix 1g of mullite fiber and 1.2g of ceramic binder, and stir evenly to obtain a ceramic fiber mixture. On the upper surface of the activated ca...

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Abstract

The invention belongs to the technical field of porous ceramic filter membrane, and relates to a preparation method of composite silicon carbide ceramic filter membrane material. The preparation method includes: well mixing silicon carbide, ceramic binder, pore-forming agent, and cellulose sodium carboxymethyl solution, forming by dry pressing to obtain a green body of a silicon carbide porous ceramic support, spreading and coating a layer of filler powder on surface of the green body, forming by dry pressing, coating ceramic fiber mixture on the surface, forming by dry pressing, coating filter membrane mixture, forming by dry pressing, and sintering to obtain the composite silicon carbide ceramic filter membrane material. The preparation method has the advantages that process is simple, volatile filler is sintered to seal pores on the surface of the support, a ceramic fiber transition layer is introduced, entering of the filter membrane material into base material can be effectively avoided, evener and smoother composite silicon carbide ceramic filter membrane material can be prepared by single sintering, and the preparation method is high in efficiency, low in energy consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic filter membrane materials, in particular to a method for preparing a composite silicon carbide ceramic filter membrane material by dry pressing and synchronous sintering technology, which is mainly used for high-temperature dust removal gas. Background technique [0002] Energy utilization is mainly obtained through direct combustion. Due to the limitation of the existing technology, the combustion is insufficient, not only the energy utilization efficiency is low, but also a large amount of dust is emitted, which seriously pollutes the environment. Improving energy efficiency and reducing dust emissions are important research directions in materials science. Ceramic filter tubes are widely used in high-temperature gas dust removal and purification technology, and have become key components for gas-solid separation, energy saving and environmental protection in materials, metallurgy, chemi...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B38/06C04B35/565B01D71/02B01D67/00
Inventor 邓湘云苏魁范李建保王春鹏张国庆
Owner HAINAN UNIVERSITY
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