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Preparation method of asymmetric plate ceramic nanofiltration membrane

A ceramic nanofiltration membrane, asymmetric technology, applied in the direction of ceramic products, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven pore size, uneven film thickness, uneven growth of particles, etc., to reduce filtration Resistance, increased filtration flux, and improved binding strength

Pending Publication Date: 2018-05-29
肖汉宁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the high activity of nanoparticles, the particles are prone to uneven growth during the sintering process of the ceramic membrane, resulting in uneven pore size and reduced porosity, resulting in reduced filtration accuracy and filtration flux
[0004] 2. The coating technology of the existing nanofiltration membrane layer is mainly realized by the screen printing process. Due to the limitation of the diameter and pore size of the screen, the thickness of the membrane layer printed each time is usually above 5 μm, and when the flatness of the support is not good enough , it is easy to cause uneven thickness of the film layer or even missing printing, which affects the filtration efficiency and filtration accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of an asymmetric flat ceramic nanofiltration membrane, the specific steps are as follows:

[0034] (1) Alumina with an average particle size of about 5 μm is prepared as plastic clay, vacuum-extruded into a hollow flat ceramic membrane support body wet body, and dried by microwave to obtain a ceramic membrane support body dry body.

[0035] (2) Sintering the dry body of the ceramic membrane support body at 1350° C. to obtain the green body of the ceramic membrane support body.

[0036] (3) Use laser engraving on the surface of the latex roller with a length of 300mm and a diameter of 200mm, and prepare hole diameters of 80 / 120 / 150 / 180μm, hole depths of 60 / 80 / 100 / 120μm, and hole densities of 4444 / 3086 / 1975 / 1370 / cm 2 Porous latex rollers with different pore sizes, pore depths and pore densities.

[0037] (4) On the surface of the ceramic membrane support green body, the hole diameter is 80 μm, the hole depth is 60 μm, and the hole density is 4444 / c...

Embodiment 2

[0042] A preparation method of an asymmetric flat ceramic nanofiltration membrane, the specific steps are as follows:

[0043] (1) Mix silicon carbide (90%) with an average particle size of about 15 μm and silicon micropowder (10%) with an average particle size of 100 nm to prepare a plastic clay, which is vacuum extruded into a hollow flat ceramic membrane support wet body, microwaved drying to obtain a ceramic membrane support body dry body.

[0044] (2) Sintering the dry body of the ceramic membrane support body at 1450° C. to obtain the green body of the ceramic membrane support body.

[0045] (3) Use laser engraving on the surface of the latex roller with a length of 500mm and a diameter of 300mm to prepare hole diameters of 50 / 100 / 150 / 200μm, hole depths of 50 / 75 / 100 / 125μm, and hole densities of 10000 / 4000 / 1975 / 1089 / cm 2 Porous latex rollers with different pore sizes, pore depths and pore densities.

[0046] (4) On the surface of the green body of the ceramic membrane...

Embodiment 3

[0051] A preparation method of an asymmetric flat ceramic nanofiltration membrane, the specific steps are as follows:

[0052] (1) Prepare cordierite powder with an average particle size of about 10 μm into plastic clay, vacuum extrude into a hollow flat ceramic membrane support body wet body, and microwave dry to obtain a ceramic membrane support body dry body.

[0053] (2) Sintering the dry body of the ceramic membrane support body at 1300° C. to obtain the green body of the ceramic membrane support body.

[0054] (3) Laser engraving is used on the surface of the latex roller with a length of 600mm and a diameter of 400mm, and the hole diameter is 80 / 120 / 150 / 180μm, the hole depth is 60 / 80 / 100 / 120μm, and the hole density is 4444 / 3086 / 1975 / 1370. / cm 2 Porous latex rollers with different pore sizes, pore depths and pore densities.

[0055] (4) On the surface of the ceramic membrane support green body, the hole diameter is 80 μm, the hole depth is 60 μm, and the hole density i...

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Abstract

The invention discloses a preparation method of an asymmetric plate ceramic nanofiltration membrane. According to the method, ceramic powder with different chemical composition and granular sizes is mixed with a water-based auxiliary, ceramic membrane slurry is prepared and printed on a plate ceramic membrane support body by a special porous emulsion roller, the support body is sintered at different temperatures, and the asymmetric plate ceramic nanofiltration membrane with different chemical composition and pore structures is formed on the surface of the support body. Density, diameter and depth of slurry adsorbing holes in the porous emulsion roller can be adjusted effectively with a laser drilling technology, so that thickness and uniformity of the ceramic membrane can be controlled precisely. The ceramic membrane with different thicknesses and surface pore size being 5-100 nm can be obtained with adoption of the porous emulsion roller with different pore density, pore diameter andpore depth. The asymmetric plate ceramic nanofiltration membrane is low in filtering resistance, high in filtering reflux, long in service life, energy-saving and environmentally friendly, and preparation cost is low.

Description

technical field [0001] The invention relates to a preparation technology of a ceramic membrane, in particular to a preparation method of an asymmetric flat ceramic nanofiltration membrane. Background technique [0002] Ceramic membranes are being used more and more widely in industrial sewage and domestic wastewater treatment, drinking water purification, etc., and are playing an increasingly important role in environmental protection. However, the pore size of the ceramic microfiltration membrane is usually between 100 and 200nm, which is not ideal for the filtration and separation of some tiny particles, especially microorganisms and organic matter in water. Therefore, the chemical oxygen demand (COD) and biological The removal effect of oxygen demand (BOD) is not significant, and it is still difficult to meet the discharge or reuse requirements of industrial wastewater after being filtered by a single ceramic microfiltration membrane. For this reason, it is often necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/06B01D69/10B01D71/02C04B41/89
CPCB01D61/027B01D67/0039B01D69/06B01D69/105B01D71/02B01D71/024B01D71/025B01D71/027C04B41/009C04B41/52C04B41/89C04B38/00C04B41/4869C04B41/5025
Inventor 肖汉宁郭文明
Owner 肖汉宁
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