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Composite modified A1203 ceramic microfiltering film

A ceramic microfiltration and modification technology, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems that it is difficult to take into account the permeability and acid and alkali corrosion resistance at the same time, and it is difficult to meet the actual requirements of the industry. Achieve excellent acid and alkali corrosion resistance

Inactive Publication Date: 2006-12-20
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ceramic membranes with a membrane pore size ranging from 0.1 to 10 microns are called ceramic microfiltration membranes. Ceramic microfiltration membranes with an average pore size of about 200 to 500 nm can be used to separate tiny particles, large colloidal particles, bacteria, etc. However, such If the material is not modified, it is often difficult to meet the practical requirements of most industries
Chinese patent (CN03155226.9) discloses a modified microfiltration membrane invented by the applicant. Although the water permeation flux of the microfiltration membrane can be improved, it is difficult to take into account both permeability and acid and alkali corrosion resistance.

Method used

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  • Composite modified A1203 ceramic microfiltering film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Preparation solution: ZnO modified layer coating solution preparation, zinc nitrate solution concentration is 0.3mol / L, Zn 2+ Add urea in / urea molar ratio 1:2, and fully stir, obtain zinc nitrate and urea mixed solution; ZrO 2 Modified layer coating liquid preparation, zirconium oxychloride is made into the solution of 0.3mol / L concentration, according to Zr 4+ The urea / urea molar ratio is 1:3, add urea, and fully stir to obtain a mixed solution of zirconium oxychloride and urea.

[0014] (2) First immerse the microfiltration membrane in the mixed solution of zinc nitrate and urea, then vacuumize it, react at 85°C for 4h, dry it and burn it at 950°C and keep it warm for 1h.

[0015] (3) Immerse the above-mentioned microfiltration membrane after being fired once in the mixed solution of zirconium oxychloride and urea, react at 90°C for 4h, dry and burn at 950°C and keep it warm for 1h to obtain ZnO·ZrO 2 Composite modified microfiltration membrane.

[0016] ...

Embodiment 2

[0018] (1) Preparation solution: ZnO modified layer coating solution preparation, zinc nitrate solution concentration is 0.3mol / L, Zn 2+ Add urea at a molar ratio of 1:2, and fully stir to obtain a mixed solution of zinc nitrate and urea; TiO 2 Modified layer coating solution preparation, titanium sulfate is made into a solution with a concentration of 0.2mol / L, according to Ti 4+ The urea / urea molar ratio is 1:3, add urea, and fully stir to obtain a mixed solution of titanium sulfate and urea.

[0019] (2) First immerse the microfiltration membrane in the mixed solution of zinc nitrate and urea, then vacuumize it, react at 85°C for 4h, dry it and burn it at 950°C and keep it warm for 1h.

[0020] (3) Immerse the above-mentioned microfiltration membrane after firing once in a mixed solution of titanium sulfate and urea, react at 95°C for 4h, dry it at 950°C and keep it warm for 1h to obtain ZnO·TiO 2 Composite modified microfiltration membrane.

[0021] Performance...

Embodiment 3

[0023] (1) Preparation solution: ZnO modified layer coating solution preparation, the concentration of zinc nitrate solution is 0.4mol / L, Zn 2+ Add urea in / urea molar ratio 1:2, and fully stir, obtain zinc nitrate and urea mixed solution; ZrO 2 Modified layer coating liquid preparation, zirconium oxychloride is made into the solution of 0.2mol / L concentration, according to Zr 4+ The urea / urea molar ratio is 1:3, add urea, and fully stir to obtain a mixed solution of zirconium oxychloride and urea.

[0024] (2) First immerse the microfiltration membrane in the mixed solution of zinc nitrate and urea, vacuumize it, react at 80°C for 4h, dry it and burn it at 1000°C and keep it warm for 1h.

[0025] (3) Then impregnate the above-mentioned microfiltration membrane after firing once in the mixed solution of zirconium oxychloride and urea, react at 95°C for 4h, dry and burn at 1000°C and keep it warm for 0.5h, and cool naturally to room temperature, Then the microfiltration membr...

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Abstract

The invention relates to a composite improved Al203 ceramic micro filter membrane, whose aperture is 200-500nm, wherein it is characterized in that: the inner surface of membrane hole is coated with two kinds of modified coats formed by semi conductive oxide, whose grain size is 5-20nm and thickness is 20-100nm. The invention reduces 17-30% aperture compared with former one, and improves 28% of filter reflux, with better acid alkali corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of inorganic ceramic membrane materials, in particular, the invention relates to a composite modified Al 2 o 3 Ceramic microfiltration membrane. Background of the invention [0002] Inorganic separation membrane is a functional material with huge specific surface area, and it is becoming an important part in the field of membrane separation technology. Ceramic membranes with a membrane pore size ranging from 0.1 to 10 microns are called ceramic microfiltration membranes. Ceramic microfiltration membranes with an average pore size of about 200 to 500 nm can be used to separate tiny particles, large colloidal particles, bacteria, etc. However, such If the material is not modified, it is often difficult to meet the practical requirements of most industries. Chinese patent (CN03155226.9) discloses a modified microfiltration membrane invented by the applicant. Although the water permeatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12
Inventor 周健儿江伟辉张小珍王艳香汪永清刘阳胡学兵吴也凡
Owner JINGDEZHEN CERAMIC INSTITUTE
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