Method for preparing high-porosity porous ceramic membrane support

A technology of porous ceramic membrane and high porosity, which is applied in the field of preparation of high-porosity porous ceramic membrane support body, which can solve the problems of poor acid and alkali corrosion resistance, large pores of the support body, and low mechanical strength, so as to improve the sintering degree , Increased porosity, and the effect of increasing the degree of neck connection

Inactive Publication Date: 2012-09-05
NANJING UNIV OF TECH
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies such as easy formation of large pores, low mechanical strength, and poor acid and alkali corrosion resistance of the support prepared by using a pore-forming agent in the traditional process, and to provide a pore-forming agent using a commonly used pore-forming agent. The preparation method of the high porosity ceramic membrane support body of agent

Method used

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  • Method for preparing high-porosity porous ceramic membrane support

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] After accurately weighing SiC (average particle size of 3 microns, purity 95.2%) and starch powder (average particle size of 35 microns) according to the mass ratio of 17:1, and high alumina ceramic balls according to the mass ratio of 1:1.2 Add it into a 1.5L rigid polyethylene bottle, place the polyethylene bottle on a ball mill and mix for 12 hours, add respectively 9% binder methyl cellulose and 9% plasticizer polyethylene glycol, fully grind for 2 hours, sieve with a 40-mesh sieve to obtain a powder with uniform particle size distribution, inject the powder into a metal abrasive tool, and use a powder tablet press to maintain it at 10MPa for 2 minutes Dry press molding to obtain a sheet-like support wet body with a diameter of Φ40mm. The wet billets were placed in an oven at a rate of 0.8°C / min to 140°C and dried for 12 hours. Place the dried support body in an electric furnace to raise the temperature to 550°C at a rate of 1°C / min and keep it for 2.5 hours; then ...

Embodiment 2

[0021] After accurately weighing SiC (average particle size of 8 microns, purity of 99.7%) and activated carbon powder (average particle size of 30 microns) according to the mass ratio of 10:1, and high alumina ceramic balls according to the mass ratio of 1: 1.5 Add to a 1.5L rigid polyethylene bottle, place the polyethylene bottle on a ball mill and mix for 24 hours, add 8% binder dextrin and 8% of the powder mass after ball milling to the raw materials after ball milling % plasticizer polyvinyl alcohol, fully grind for 1h, sieve with a 30-mesh sieve to obtain a powder with uniform particle size distribution, inject the powder into a metal abrasive tool, and keep it dry for 1.5min at 7MPa using a powder tablet press Press molding to obtain a sheet-shaped support body wet body with a diameter of Φ30mm. The wet billets were placed in an oven at a rate of 0.6°C / min to 130°C and dried for 20 hours. Place the dried support body in an electric furnace to raise the temperature to 6...

Embodiment 3

[0023] Aluminum oxide (average particle size is 6 microns, purity is 99.7%) and starch powder (average particle size is 30 microns) are accurately weighed according to the mass ratio of 8:1, and high alumina ceramic balls are used according to the mass ratio of 1 : 2 joins in the 1.2L hard polyethylene bottle, puts the polyethylene bottle on the ball mill and mixes 30h, in the raw material after the ball mill, add respectively the binder paraffin that quality is 7% of the powder quality after the ball mill and 7% % Plasticizer polyvinyl alcohol, fully grind for 1.5h, sieve with a 40-mesh sieve to obtain a powder with uniform particle size distribution, inject the powder into a metal abrasive tool, and use a powder tablet press to maintain dry pressing at 8MPa for 1min Forming to obtain a sheet-shaped support wet body with a diameter of Φ30mm. The wet billet was placed in an oven and heated to 120°C at a rate of 0.5°C / min and dried for 24 hours. Place the dried support body in...

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Abstract

The invention relates to a method for preparing a high-porosity porous ceramic membrane support, comprising the following specific steps of: performing mixed ball milling and dispersion on a ceramic powder aggregate and a pore-forming agent, adding in a binder and a plasticizer, and then performing grinding, sieving, tabletting, drying and sinter molding. The method provided by the invention overcome the problem of easy formation of large pores in the presence of the pore-forming agent and further improves the porosity of the support without reducing the overall performance of the support by improving the purity of the ceramic powder aggregate and adjusting the content of the pore-forming agent, the size distribution and the sintering schedule; and as a result, the penetrating quality of the support is improved.

Description

technical field [0001] The invention relates to a preparation method of a high-porosity porous ceramic membrane support body, belonging to the field of preparation of porous ceramic materials. Background technique [0002] Porous ceramic membranes have been widely used in the fields of medicine, food, chemical industry, biology, dyes and water treatment. Compared with organic membranes, ceramic membranes have attracted widespread attention due to their high temperature resistance, polar solvent resistance, acid and alkali corrosion resistance, and environmental friendliness, and have gradually realized their applications in petrochemical, pharmaceutical engineering, and environmental engineering. The large-scale application in this aspect has achieved good social and economic benefits. [0003] However, the preparation of ceramic membranes is very difficult, one of the important reasons is that high-quality supports are not easy to obtain. How to prepare high-performance s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/622
Inventor 漆虹董国祥徐南平
Owner NANJING UNIV OF TECH
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