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Orientated penetration porous ceramic for high temperature flue gas filtration and preparation method thereof

A high-temperature flue gas filtration, porous ceramic technology, applied in the field of ceramic materials, can solve the problems of only 8MPa compressive strength, unsatisfactory pore directional penetration effect, and narrow application range, achieving low ice crystal growth resistance and adapting to pulse backflushing. Good cleaning and fluidity

Inactive Publication Date: 2015-03-11
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese patent "A Pore Gradient Silicon Carbide Porous Ceramic and Its Preparation Method" (Application No.: 201110252396.5, Publication No.: 102417366A) discloses a pore gradient silicon carbide porous ceramic and its preparation technology. The invention uses polycarbosilane and carbonization Silicon powder is used as raw material, and carbon powder is used as pore-forming agent. Gradient porous ceramics are prepared by dry pressing and sintering. The gradient structure mainly depends on the diameter and amount of carbon powder, and the connectivity of pores mainly depends on the polycarbosilane Cracking, high back pressure, narrow application range
Chinese patent "A method for preparing zirconia gradient porous ceramics using ice as a template" (application number: 201110264529.0, publication number: 102424603A) discloses a method for preparing zirconia gradient porous Hole template, zirconia porous ceramics obtained by vacuum freeze-drying and sintering process, but its compressive strength is only 8MPa, and the directional penetration effect of pores is not ideal, which is far from the requirements of low back pressure and high strength in actual filtration

Method used

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  • Orientated penetration porous ceramic for high temperature flue gas filtration and preparation method thereof
  • Orientated penetration porous ceramic for high temperature flue gas filtration and preparation method thereof
  • Orientated penetration porous ceramic for high temperature flue gas filtration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take γ-Al with an average particle size of 0.1 μm 2 o 3 7.2 g of powder, 4.8 g of low-temperature glass sintering aid with an average particle size of 0.5 μm (the glass sintering aid is CaO-B 2 o 3 -SiO 2 , by CaO:38%, B 2 o 3 :20%, SiO2 2 :40%, Na 2 O: 2% (weight ratio) obtained by smelting), ceramic water system dispersant (sodium polyacrylate) 0.12 g, water reducer (polycarboxylate water reducer) 0.12 g mixed.

[0028] (2) Add 15 g of distilled water to the powder obtained in step (1), put it into a zirconia ball mill jar, use a ball-to-material ratio of 1:7, and perform ball milling on a ball mill to prepare a uniform slurry.

[0029] (3) Pour the slurry into a mold with a polished bottom, and place the mold on a cooling end with a freezing rate of 1°C / min to freeze the slurry completely.

[0030] (4) Dry the frozen slurry in a vacuum state freeze dryer at low temperature and low pressure for 40 hours, and demould to obtain a ceramic green body.

[0031...

Embodiment 2

[0033] (1) Take γ-Al with an average particle size of 0.5 μm 2 o 3 10 g of powder, 5 g of low-temperature glass sintering aid with an average particle size of 1 μm (the glass sintering aid is CaO-B 2 o 3 -SiO 2 with yttrium oxide (Y 2 o 3 ) mixture, CaO-B 2 o 3 -SiO 2 with Y 2 o 3 The mass ratio is 4:1), ceramic water system dispersant (sodium polyacrylate) 0.3 g, water reducer (polycarboxylate water reducer) 0.2 g mixed.

[0034] (2) Add 21 g of distilled water to the powder obtained in step (1), put it into a zirconia ball mill tank, and use a ball-to-material ratio of 1:7 to perform ball milling on a ball mill to prepare a uniform slurry.

[0035] (3) Pour the slurry into a mold with a polished bottom, and place the mold on a cooling end with a freezing rate of 1°C / min to freeze the slurry completely.

[0036] (4) Dry the frozen slurry in a vacuum state freeze dryer at low temperature and low pressure for 40 hours, and demould to obtain a ceramic green body.

[...

Embodiment 3

[0039] (1) Take γ-Al with an average particle size of 0.4 μm 2 o 3 16.8 g of powder, 21 g of low-temperature glass sintering aid with an average particle size of 1 μm (the glass sintering aid is CaO-B 2 o 3 -SiO 2 with cerium oxide (Y 2 o 3 ) mixture, CaO-B 2 o 3 -SiO 2 with Y 2 o 3 The mass ratio is 6:1), ceramic water system dispersant (sodium polyacrylate) 0.84g, water reducer (polycarboxylate water reducer) 0.28g mixed.

[0040] (2) Add 27.2 g of distilled water to the powder obtained in step (1), put it into a zirconia ball mill jar, use a ball-to-material ratio of 1:7, and perform ball milling on a ball mill to prepare a uniform slurry.

[0041] (3) Pour the slurry into a mold with a polished bottom, and place the mold on a cooling end with a freezing rate of 2°C / min to freeze the slurry completely.

[0042] (4) Dry the frozen slurry in a vacuum state freeze dryer at low temperature and low pressure for 40 hours, and demould to obtain a ceramic green body.

...

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Abstract

The invention relates to an orientated penetration porous ceramic for high temperature flue gas filtration and a preparation method thereof. The aperture of the porous ceramic is in gradient change from an open end to a closed end, and is in the range of 10-160 mum. The preparation method mainly comprises the following steps: (1) adding certain proportion of distilled water, a low temperature glass sintering agent, a water reducing agent and a ceramic water disperser in an alumina powder, and milling into an uniform sizing agent; (2) pouring the slurry into a mold with bottom polishing treatment,freezing in a refrigeration end with refrigeration speed of 1-2 DEG C / min to completely freeze the sizing agent; (3) drying the frozen sizing agent in a slurry vacuum freezing dryer at low temperature and low pressure, and demoulding to obtain a ceramic biscuit; and (4) sintering the ceramic biscuit. Compared with the traditional high temperature flue gas filtering ceramic, the porous ceramic prepared by the invention has the characteristics of high strength, high tier filtration precision, low back pressure and good ash storage capacity, is more suitable for pulse cleaning, can effectively reduce or eliminate the dust bridge phenomenon in the filtration process.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a directional through-hole porous ceramic for filtering high-temperature flue gas and a preparation method thereof. Background technique [0002] The exhaust gas emitted by various industrial furnaces in metallurgy, machinery, chemical industry, electric power and other industries is not only high in temperature, but also contains a large amount of dust and harmful gases, which is one of the main factors causing environmental pollution. Under high temperature conditions, due to the large change in the viscosity of the exhaust gas, the humidity will drop sharply, and the aggregation of fine particles will be reduced, making it difficult to separate the particles. Cyclone dust removal cannot meet high purification requirements; wet dust removal is difficult to make comprehensive use of heat energy; electrostatic dust removal has problems such as high one-tim...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B38/06C04B35/622
Inventor 程西云彭美华周彪张建峰严茂伟
Owner SHANTOU UNIV