Preparation method of large-size thin-wall hollow flat-plate ceramic film

A large-size, ceramic membrane technology, applied in the field of ceramic membranes, can solve the problems of poor acid and alkali corrosion resistance, no effective control measures, high raw material costs, etc., to achieve good acid and alkali corrosion resistance, smooth pores, filter resistance, chemical The effect of high composition purity

Active Publication Date: 2015-01-07
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on existing patents and literature research, it can be found that the raw materials selected for the flat ceramic membrane support are mostly prepared from high-purity raw materials, and the support has good acid and alkali resistance, but its sintering temperature is generally above 1400 ° C, and the sintering temperature is high. High energy consumption; by adding clay, feldspar and other co-solvent methods, although the sintering temperature of the flat membrane support is reduced, the final product has poor acid and alkali corrosion resistance, which affects the service life of the product
At the same time, no effective control measures have been proposed in the patents for the deformation of the large-size thin-walled flat film support during extrusion, drying, and sintering.
The water filtration resistance of the flat membrane coated with the separation membrane layer increases. Although the use of self-spheroidized separation membrane layer aggregate can reduce the filtration resistance of the membrane layer to a certain extent, the cost of raw materials is relatively high.

Method used

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  • Preparation method of large-size thin-wall hollow flat-plate ceramic film
  • Preparation method of large-size thin-wall hollow flat-plate ceramic film
  • Preparation method of large-size thin-wall hollow flat-plate ceramic film

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Experimental program
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Effect test

Embodiment 1

[0052] The proportioning composition of the flat film of the present invention is as follows: the particle size is 2 μm α-Al 2 o 3 Powder, starch, carboxymethyl cellulose with the ratio of 80wt%: 10wt%: 10wt%, the total mass of solid raw materials is 100kg; Ratio, the total mass of liquid raw materials is 25kg.

[0053]The above two raw materials, solid and liquid, are mixed in a weight ratio of 4:1.

[0054] Preparation method: mix the pre-mixed powder and liquid raw materials, knead in a kneader, refine the mud in a mud mill to make porous ceramic molding mud, and age for 24 hours. Put the stale mud into a hydraulic extruder and extrude it. The extrusion pressure is 6MPa, the extrusion speed is 3m / min, and the extrusion temperature is 25°C. The outgoing direction is at an included angle of 45°. The extruded plastic green body was placed on a perforated flat plate covered with fiber felt, and dried in a microwave oven for 1 hour. The dried semi-finished products are stac...

Embodiment 2

[0058] The dosing composition of the flat film of the present invention is as follows: solid raw material: a particle size of 20 μm α-Al 2 o 3 The ratio of powder, charcoal, and dextrin is 90wt%: 5wt%: 5wt%, the total mass of solid raw materials is 120kg; the ratio of liquid raw materials: water, oleic acid, and nano-silica dispersion is 80wt%: 15wt%: 5wt %, the total mass of liquid raw materials is 20kg.

[0059] The above two raw materials, solid and liquid, are mixed in a weight ratio of 6:1.

[0060] Preparation method: mix the pre-mixed powder and liquid raw materials, knead them in a kneader, refine the mud in a mud mill to make porous ceramic plastic mud, and age for 30 hours. Put the stale mud into the hydraulic extruder and extrude it. The extrusion pressure is 5MPa, the extrusion speed is 2m / min, and the extrusion temperature is 25°C. The outgoing direction is at an included angle of 30°. The extruded plastic green body was placed on a porous flat plate covered w...

Embodiment 3

[0064] The dosing composition of the flat film of the present invention is as follows: a particle size of 100 μm α-Al 2 o 3 Powder, activated carbon, and hydroxypropyl cellulose have a weight ratio of 85wt%: 7wt%: 8wt%, and the total mass of solid raw materials is 100kg; Weight ratio, the total mass of liquid raw materials is 20kg.

[0065] The above two raw materials, solid and liquid, are mixed in a weight ratio of 5:1.

[0066] Preparation method: mix the pre-mixed powder and liquid raw materials, knead them in a kneader, refine the mud in a mud mill to make porous ceramic plastic mud, and age for 48 hours. Put the stale mud into a hydraulic extruder and extrude it. The extrusion pressure is 4MPa, the extrusion speed is 1.5m / min, and the extrusion temperature is 25°C. The direction of extrusion is at an angle of 10°. The extruded plastic green body was placed on a perforated flat plate covered with fiber felt, and dried in a microwave oven for 1 hour. The dried semi-fi...

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Abstract

The invention belongs to the technical field of ceramic films, and in particular relates to a preparation method of a large-size thin-wall hollow flat-plate ceramic film. The preparation method comprises preparation of a flat-plate ceramic supporting body and preparation of a separation film layer. According to the preparation method, an alpha-Al2O3 powder body is coated by nano silicon dioxide dispersing liquid, so that the sintering temperature of the flat-plate film supporting body is greatly lowered, and the production energy consumption of a product is reduced; furthermore, chemical components of the supporting body are relatively high in purity, and the acid-alkali corrosion resistance is high; in a process of preparing a large-size thin-wall flat-plate film, deformation of a flat-plate film blank in extrusion, drying and sintering processes can be greatly reduced, and the yield of the flat-plate film is increased; the separation film layer adopts ceramic powder body particles modified by nano-silica sol; the surfaces of the particles are rounded and spheroidized; a duct of the prepared separation film layer is smooth and is low in filtering resistance; the water flux can be increased by over 30 percent.

Description

technical field [0001] The invention belongs to the technical field of ceramic membranes, and in particular relates to a preparation method of a large-scale thin-walled hollow flat ceramic membrane. Background technique [0002] Membrane bioreactor is a high-efficiency sewage treatment equipment that combines membrane separation technology and microbial technology. The core component of the membrane bioreactor is the separation membrane. At present, the separation membrane is roughly divided into organic separation membrane and ceramic separation membrane according to the material. Compared with organic membranes, ceramic membranes have the characteristics of high temperature resistance, acid and alkali corrosion resistance, and solvent resistance, and have been widely used in engineering fields. Compared with tubular ceramic membranes and multi-channel ceramic membranes, plate ceramic membranes have the characteristics of convenient installation, low filtration resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D71/02B01D67/00
Inventor 赵世凯薛友祥张鹤穆晓艳曹俊昌张晓丽
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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