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Method for preparing zirconia ceramic ultrafiltration membrane

A zirconia ceramic and ultrafiltration membrane technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of small permeation flux, poor membrane strength, and insufficient filtration accuracy, and achieve high precision. The effect of filtering effect, reducing production cost and improving production efficiency

Active Publication Date: 2019-09-24
翁志龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Generally speaking, the current ceramic ultrafiltration membrane preparation technology has a wide pore size distribution in the direct hydrothermal method, and it is difficult to obtain products with consistent pore size and performance in industrial production. The overall filtration accuracy is not high enough. The sol-gel method The pore size distribution of the ceramic ultrafiltration membrane prepared by direct calcination is also relatively wide, and the strength of the membrane layer is poor. First, the zirconium sol is calcined into nano-zirconia, and then configured into a coating solution for sintering. Although the pore size is small and the pore size distribution is narrow, the water The permeation flux is small, and the energy consumption is large in industrial applications

Method used

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  • Method for preparing zirconia ceramic ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 58g of zirconium oxychloride octahydrate in 192g of water, raise the temperature to 70°C and add 7.5% aqueous ammonia solution with stirring until the pH rises to 8.5, and stir for 2 hours to form a white emulsion. Suction filter the white emulsion with a suction filter, add water and then suction filter several times until the chloride ion concentration is lower than 10PPM. After that, add water to the filtered precipitate to 200g, raise the temperature to 70°C and stir, then slowly add 6.4% nitric acid aqueous solution until the pH of the solution drops to 1.5, and continue to keep stirring at 70°C for 10 hours. Then take out the solution, add 120g of water, add 10g of glycerin, add 10g of polyethylene glycol 1000, add 20g of polyvinyl alcohol aqueous solution with a concentration of 20%, stir evenly, and dip and coat the solution on a 200nm ceramic filter membrane substrate. Afterwards, the substrate is dried, put into a high-temperature reaction kettle, and...

Embodiment 2

[0033] Dissolve 50g of zirconium oxychloride octahydrate in 192g of water, raise the temperature to 75°C and add 7.2% aqueous ammonia solution with stirring until the pH rises to 8.2, and stir for 2 hours to form a white emulsion. Suction filter the white emulsion with a suction filter, add water and then suction filter several times until the chloride ion concentration is lower than 10PPM. After that, add water to the precipitate after suction filtration to 180g, raise the temperature to 70°C and stir, then slowly add 5% nitric acid aqueous solution until the pH of the solution drops to 0.5, and continue to keep stirring at 75°C for 10 hours. Then take out the solution, add 120g of water, add 12g of glycerin, add 12g of polyethylene glycol 1000, add 20g of 10% polyvinyl alcohol aqueous solution, stir evenly, dip and coat the solution on a 100nm ceramic filter membrane substrate. Afterwards, the matrix is ​​dried, put into a high-temperature reaction kettle, and an aqueous sol...

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Abstract

The invention discloses a method for preparing a zirconia ceramic ultrafiltration membrane. The method is characterized by comprising the following steps: preparing a zirconia sol by using a sol-gel method; uniformly mixing the zirconia sol with a certain amount of water as well as one or more of polyethylene glycol, polyvinyl alcohol, methylcellulose and glycerinum so as to obtain a film coating liquid; impregnating the film coating liquid onto the surface of a ceramic filtering membrane substrate; and drying the substrate after the coating, further soaking the dried substrate into a nitric acid solution of which the pH value is 1-3 in a high-temperature reaction kettle, and carrying out a hydrothermal reaction at 180-220 DEG C, so as to obtain a ceramic ultrafiltration membrane with a uniform aperture of 10-20nm.

Description

technical field [0001] The invention relates to a preparation method of a zirconia ceramic ultrafiltration membrane, which belongs to the field of porous ceramic preparation. Background technique [0002] Ceramic membrane is an important technology for precision filtration and separation. Among them, 5-50nm ultrafiltration ceramic membranes are widely used in the purification of brine in the chlor-alkali industry, the filtration of amino acid fermentation liquid, the clarification and filtration of plant extracts, the treatment of oily wastewater, the filtration of chemical wastewater containing organic solvents and high suspended matter, and the filtration of oil-containing Reuse of reclaimed water such as rust condensate. [0003] At present, there are many preparation technologies for ceramic ultrafiltration membranes, including sol-gel method, particle sintering method, direct hydrothermal method, etc., which can prepare ceramic ultrafiltration membranes with certain in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/14
CPCB01D71/024B01D67/0039B01D67/0048B01D67/0051B01D61/145
Inventor 翁志龙
Owner 翁志龙
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