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Silicon carbide ceramic support body and preparation method thereof

A technology of silicon carbide ceramics and supports, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of limiting the application of ceramic membranes, reducing the permeable flux of supports, and insufficient strength

Inactive Publication Date: 2012-03-28
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing technology, commercialized ceramic membrane supports are mainly sintered with high-purity special alumina, and submicron or nano-scale alumina particles or sol are generally added to the alumina aggregate to improve the strength of the support. The effect of strength, but reduces the permeable flux of the support body, and its flux is only 4600-11000L.M -2 .H -1 .bar -1
At the same time, due to insufficient strength, the support needs to be thicker, so the membrane area in the channel is small, resulting in low integration of ceramic membrane filtration equipment, high equipment cost, and high operating costs, which limit the use of ceramic membranes in water treatment, oil and water. applications in separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 5 kg of silicon carbide powder with a median particle diameter D50 of 45 μm, 0.5 kg of silicon carbide powder with a median particle diameter D50 of 3 μm, and 0.1 kg of methyl cellulose, after stirring and mixing evenly, add 0.25 kg of 30% polyvinyl alcohol aqueous solution, 0.65kg of water. Stir for one hour to form a mud, extrude the mud with a briquette-type outer circle and inner square geometry mold to form a green body, and dry it at 50°C for 4 hours; then calcinate it in the air at 800°C for 1 hour; the calcined green body Sintering was carried out at a temperature of 2500° C. for 3 hours in a hydrogen atmosphere at atmospheric pressure. The flux of the obtained silicon carbide ceramic membrane support body is 51000L.M -2 .H -1 .bar -1 , Bursting strength is 11Mpa.

Embodiment 2

[0016] 5 kg of silicon carbide powder with a median particle diameter D50 of 25 μm, 0.3 kg of silicon carbide powder with a median particle diameter of 1 μm, and 0.08 kg of polymer polysaccharide. After stirring and mixing evenly, add 0.3 kg of 2% methylcellulose aqueous solution, 0.5kg of water. Stir for one hour to form a mud, extrude the mud with a briquette-type outer circle and inner square geometry mold to form a green body, and dry it at 50°C for 4 hours; then calcinate it in the air at 800°C for 1 hour; the calcined green body Sintering was performed at 2300° C. for 3 hours in an argon atmosphere at atmospheric pressure. The obtained silicon carbide ceramic membrane support has a flux of 39000L.M -2 .H -1 .bar -1 , Bursting strength is 9Mpa.

Embodiment 3

[0018] 5kg of silicon carbide powder with a median particle size D50 of 36.5μm, 0.4kg of silicon carbide powder with a median particle size of D50 of 1.5μm, 0.08kg of polymer polysaccharide, and 0.15kg of cornstarch. After mixing evenly, add 30% polyethylene Alcohol aqueous solution 0.3kg, water 0.7kg. Stir for 1 hour to form a mud, seal the mud and stale for 48 hours, then extrude the mud with a briquette-style outer circle and inner square geometry mold to form a green body, dry at 60°C for 4 hours; then dry it in the air at 600°C Calcining for 1 hour; sintering the calcined green body at a temperature of 2400° C. for 2 hours in an argon atmosphere at atmospheric pressure. The obtained silicon carbide ceramic membrane support has a flux of 44000L.M -2 .H -1 .bar -1 , Bursting strength is 10.5Mpa.

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Abstract

The invention relates to a silicon carbide ceramic support body and a preparation method thereof. The raw material powder of the support body is mixed powder consisting of silicon carbide powder 1 and silicon carbide powder 2, wherein the silicon carbide powder 1 has a median particle diameter D50 of 25-45mu m, the silicon carbide powder 2 has a median particle diameter D50 of less than 5mu m, the ratio of the D50 of the silicon carbide powder 1 to the D50 of the silicon carbide powder 2 is not less than 6, and the consumption of the silicon carbide powder 2 is 0.5-13 percent of the weight of the used silicon carbide powder 1. The raw material powder is mixed with a solvent, an adhering agent, a plasticizer and a pore-forming agent to form pug, the pug is subjected to stamping to form a raw blank, the raw blank is dewatered and degreased to form a calcined product, and the calcined product is sintered in argon or hydrogen atmosphere or vacuum to form the support body of a recrystallized silicon carbide ceramic membrane. The support body of the recrystallized silicon carbide ceramic membrane has filtering flux and strength which are higher than those of the traditional commercial support body of an aluminum oxide ceramic membrane.

Description

technical field [0001] The invention relates to a ceramic membrane support body and a preparation method thereof, in particular to a silicon carbide ceramic membrane support body and a preparation method thereof. Background technique [0002] Membrane separation technology has become internationally recognized as one of the most promising production, environmental protection and energy-saving technologies in the 21st century. Among them, the ceramic membrane separation technology not only solves the difficult filtration problems such as high temperature, high pressure, strong acid and alkali, and chemical solvent media, but also has the characteristics of high filtration precision, good clean state, easy cleaning, and long service life. It is widely used in petroleum, chemical, and pharmaceutical industries. It has broad application prospects in the fields of food, environmental protection and water treatment. It plays a very important role in solving the problems of resourc...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D71/02
Inventor 洪昱斌翁志龙蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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