Ceramic membrane support and preparation method thereof

A ceramic membrane support body and the technology of the support body are applied in the field of porous ceramic preparation, which can solve the problems of reducing the permeable flux of the support body and the porosity of the support body, and achieve the effects of high strength, low sintering temperature, and increased porosity.

Inactive Publication Date: 2012-04-11
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, commercialized ceramic membrane supports are mainly sintered with high-purity special alumina. In order to obtain sufficient strength, submicron or nanoscale alumina or oxides are generally added to the alumina aggregate. Sol, which plays a role in improving the strength of the support, but reduces the water permeability of the support
CN 101139206A describes the use of ultrafine crystal nucleus particle suspension as a sintering aid added to ceramic powder aggregates to manufacture ceramic membrane supports, and the ultrafine crystal nucleus particles are filled in the gaps of the aggregate to provide high sintering activity , so that the support body can be sintered at a lower temperature of 1100-1500 ° C, which reduces the manufacturing cost, but this kind of filling reduces the porosity of the support body, and its flux is only 4600-11000L.M-2.H-1 .bar-1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 3 kg of α-alumina with an average particle size of 30 microns, 0.5 kg of silicon oxide with an average particle size of 5 microns, 0.05 kg of titanium oxide, 0.3 kg of graphite with an average particle size of 20 microns, and 0.06 kg of methyl cellulose. Mix and stir evenly, add The water with 16% of powder mass is kneaded into mud and extruded. The green body was heated to 1550° C. and kept for 2 hours to obtain a mullite ceramic membrane support body with an average pore diameter of 15 microns and a porosity of 52%. The support body was heated to 100° C. in 20% sulfuric acid and kept for 72 hours, and its strength loss rate was 4.8%.

Embodiment 2

[0028] 3 kg of α-alumina with an average particle size of 40 microns, 0.6 kg of silicon oxide with an average particle size of 5 microns, 0.2 kg of lanthanum nitrate, 0.25 kg of 200-mesh flour, and 0.045 kg of polymer polysaccharide. Mix and stir evenly, and add 18% of the powder mass The water is kneaded into a slurry and extruded. The green body was heated to 1500° C. and kept for 2 hours to obtain a mullite ceramic membrane support body with an average pore diameter of 12 microns and a porosity of 55%. The support body was heated to 100° C. in 20% sulfuric acid and kept for 72 hours, and its strength loss rate was 5.1%.

Embodiment 3

[0030] The average particle diameter is 3kg of α-alumina of 25 microns, 0.1kg of fumed silica of 30 nanometers, 0.2kg of organosilicon sol, 0.2kg of lanthanum nitrate, 0.2kg of 200 mesh dextrin, and 0.1kg of polyethylene glycol are mixed and stirred evenly, Add 8% water of powder mass to knead into mud and extrude. The green body was heated to 1450° C. and kept for 2 hours to obtain a mullite ceramic membrane support body with an average pore diameter of 10 microns and a porosity of 50%. The support body was heated to 100° C. in 20% sulfuric acid and kept for 72 hours, and its strength loss rate was 5.9%.

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PUM

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Abstract

The invention discloses a ceramic membrane support and a preparation method thereof. The support is prepared from the following materials by mass: 50 to 80% of alpha-alumina, 10 to 30% of a compound of silicon, 1 to 10% of a sintering aid and 3 to 15% of a binder and a pore forming agent. The preparation method provided in the invention mainly comprises the steps of formation of green bodies and sintering. According to the invention, alumina and a silicon-containing inorganic substance or organic matter are used as reaction components for manufacture of a mullite support, which enables a composition to have reduced volume and increased pore; the support prepared thereafter has high porosity and strength. According to the invention, cheaper alumina and lower sintering temperature can be employed for preparation of the support, which enables preparation cost for the support to be reduced.

Description

technical field [0001] The invention relates to a preparation method of a ceramic membrane support body, and belongs to the field of preparation of porous ceramics. Background technique [0002] In the field of membrane separation, inorganic membranes are widely used in microfiltration and ultrafiltration of liquid media and gas separation. [0003] The inorganic membrane made by depositing inorganic materials on the support body can be used for filtration and separation applications in the environmental industry, food and beverage industry, biological industry, chemical industry, and petrochemical industry. Specific particles include separation of oil-water mixtures, wastewater treatment, filtration of wine and fruit juices, filtration of bacteria and viruses from liquids. [0004] In the existing technology, commercialized ceramic membrane supports are mainly sintered with high-purity special alumina. In order to obtain sufficient strength, submicron or nanoscale alumina ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622
Inventor 洪昱斌翁志龙蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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