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Method for preparing high-strength ceramic membrane by cofiring once

A ceramic membrane and high-strength technology, which is applied in the field of ceramic membranes, can solve the problems of low bonding strength between ceramic membranes and supports, shedding of ceramic membrane layers, and increased energy consumption, so as to ensure the effect of filtration and dust removal, complete regeneration, and equipment maintenance. and low running costs

Active Publication Date: 2015-03-25
湖南科一环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems brought by this method are firstly that the secondary firing increases the energy consumption of the preparation process, which is not conducive to energy saving and environmental protection; secondly, the bonding strength between the ceramic membrane and the support body is not high, and the ceramic membrane layer is prone to fall off during use. The phenomenon

Method used

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  • Method for preparing high-strength ceramic membrane by cofiring once
  • Method for preparing high-strength ceramic membrane by cofiring once

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing high-strength ceramic membranes by one-time co-firing, specifically:

[0033] (1) The raw material of the ceramic membrane support is composed of 48% by weight calcined bauxite, 25% high plasticity clay, 15% china clay and 12% feldspar. The hard raw materials in the formula are calcined bauxite and feldspar Select the powder that has been crushed to an average particle size below 10 microns, mix the hard raw material powder with other raw materials, and then ball mill for 5 hours to obtain a support body slurry;

[0034] (2) After sieving the support body slurry and removing iron, add rice bran as a pore-forming material. Before adding, the rice bran needs to be crushed to a fineness of 320 mesh, and then add an appropriate amount of water to disperse evenly with a high-speed mixer, and press filter to obtain mud after dehydration. cake.

[0035] (3) The mud cake is aged for more than 24 hours after roughing, and then vacuum-extruded into a wet b...

Embodiment 2

[0041] A method for preparing high-strength ceramic membranes by one-time co-firing, specifically:

[0042] (1) The raw material of the ceramic membrane support is composed of 40% calcined bauxite, 30% high plasticity clay, 20% china clay and 10% feldspar by weight percentage, and the hard raw materials in the formula are calcined bauxite and feldspar Select the powder that has been crushed to an average particle size below 10 microns, mix the hard raw material powder with other raw materials, and then ball mill for 5 hours to obtain a support body slurry;

[0043] (2) After sieving the support body slurry and removing iron, add straw as a pore-making material. Before adding, the straw needs to be crushed to a fineness of 250 mesh, and then add an appropriate amount of water to disperse evenly with a high-speed mixer, and press filter to obtain mud after dehydration cake.

[0044] (3) The mud cake is aged for more than 24 hours after roughing, and then vacuum-extruded into a ...

Embodiment 3

[0050] The method for preparing a high-strength ceramic membrane by co-firing at one time is specifically:

[0051] (1) The raw material of the ceramic membrane support is composed of 35% calcined bauxite, 35% high plasticity clay, 15% china clay and 15% feldspar by weight percentage, and the hard raw materials in the formula are calcined bauxite and feldspar Select the powder that has been crushed to an average particle size below 10 microns, mix the hard raw material powder with other raw materials, and then ball mill for 5 hours to obtain a support body slurry;

[0052] (2) After sieving the support body slurry and removing iron, add straw as a pore-making material. Before adding, the straw needs to be crushed to a fineness of 250 mesh, and then add an appropriate amount of water to disperse evenly with a high-speed mixer, and press filter to obtain mud after dehydration. cake.

[0053] (3) The mud cake is aged for more than 24 hours after roughing, and then vacuum-extrude...

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Abstract

The invention provides a method for preparing a high-strength ceramic membrane by cofiring once. The method comprises the following steps: fully mixing ceramic body paste by taking calcined bauxite and high-plasticity clay as main raw materials with a plant pore-forming material; fabricating a ceramic membrane support body green body in a vacuum extrusion manner; drying and then spraying ceramic membrane slurry on the surface of the green body; and then cofiring once in a roller kiln. The strength of a support body of the ceramic membrane is provided by a composite ceramic material which is highly densified and takes alundum particle and mullite whiskers generated in situ as strengthening phases; and the aperture and the porosity are regulated and controlled by the plant pore-forming material which is in a fibrous or flaky structure and is completely burnt at high temperature, and therefore, the ceramic membrane has the relatively good pore connectivity characteristics, the support body of the ceramic membrane, with high strength and a high connected pore structure, is obtained; the bonding strength of a ceramic membrane layer and the support body is high by the cofiring once; the service life is long; and meanwhile, the ceramic membrane has the characteristics of low preparation cost, energy conservation and the like.

Description

technical field [0001] The invention relates to the technical field of ceramic membranes, and further refers to a preparation method of high-strength ceramic membranes. Background technique [0002] The bag filter is the most widely used dust removal equipment in dust filtration, but it also has the following problems. First, it is not resistant to high temperature. When the gas temperature exceeds 200 ° C, it cannot be used. Even the bag filter made of glass fiber cannot It can only be used below 400°C; second, when the gas humidity is high (humid), the dust adheres to the bag and is difficult to fall off, making the dust removal equipment unable to operate normally; third, dust recovery is easy to generate secondary dust, and the regeneration of the bag is not complete. Reduce dust removal efficiency. [0003] Ceramic membranes have been widely used in sewage treatment, high-temperature flue gas treatment and dust collection, and have played an important role in environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B33/13
Inventor 肖汉宁李格郭文明
Owner 湖南科一环保科技股份有限公司
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