Wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, and preparation method thereof

A technology of honeycomb ceramics and high-temperature waste gas, applied in ceramic products, applications, household appliances, etc., can solve the problems of low porosity, poor thermal shock resistance, low strength, etc., achieve high porosity, promote sintering, and easy to control. Effect

Active Publication Date: 2013-02-13
GUANGDONG DOWSTONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the ceramic filter body, its thermal expansion coefficient, thermal shock resistance, porosity, strength and pore size are mutually affected and restricted. For example, if you want to increase the porosity and increase the average pore size, you must sacrifice the material strength at the expense of
At present, the existing technology usually uses a single raw material or ordinary particles to prepare ceramic filters, which generally have problems such as poor thermal shock resistance, low strength or low porosity, which makes it difficult to meet the actual processing requirements

Method used

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  • Wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, and preparation method thereof
  • Wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, and preparation method thereof
  • Wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. The wall-flow honeycomb ceramic filter body for purification of high-temperature exhaust gas in this embodiment, the composition of its basic raw materials is:

[0026]

[0027] In addition, based on the above basic raw materials, add: pore-forming agent walnut shell powder (100-120 μm, the same below) 2.2wt%, hydroxypropyl methylcellulose 6wt%, glycerin 4wt%, water 23wt%.

[0028] 2. The preparation method of the wall-flow honeycomb ceramic filter body for high-temperature exhaust gas purification in this embodiment is as follows:

[0029] (1) Add Suzhou soil, alumina, and pore-forming agent into the mixer, and add hydroxypropyl methylcellulose and mix together for 30 minutes; then add cordierite and aluminum titanate and mix for 30 minutes to obtain a mixed material;

[0030] (2) Add glycerin and water to the mixed material and mix for 30 minutes to obtain mud;

[0031] (3) The mud material is prepared into a mud section through aging and vacuum mud refining, a...

Embodiment 2

[0035] 1. The wall-flow honeycomb ceramic filter body for purification of high-temperature exhaust gas in this embodiment, the composition of its basic raw materials is:

[0036]

[0037]

[0038] In addition, based on the above-mentioned basic raw materials, 2.2wt% of walnut shell powder, 6wt% of hydroxypropyl methylcellulose, 4wt% of glycerin, and 23wt% of water were added.

[0039] 2. The preparation method of the wall-flow honeycomb ceramic filter body for purifying high-temperature exhaust gas in this embodiment is the same as that in Embodiment 1.

[0040]3. The performance indicators of the wall-flow honeycomb ceramic filter body in this embodiment are as follows: porosity 45.2%, compressive strength 26.5MPa, average pore diameter 15.0μm, thermal expansion coefficient 1.63×10 -6 / ℃, thermal stability 20 ~ 850 ℃ air cooling once without cracking.

Embodiment 3

[0042] 1. The wall-flow honeycomb ceramic filter body for purification of high-temperature exhaust gas in this embodiment, the composition of its basic raw materials is:

[0043]

[0044] In addition, based on the above-mentioned basic raw materials, 2.2wt% of walnut shell powder, 6wt% of hydroxypropyl methylcellulose, 4wt% of glycerin, and 23wt% of water were added.

[0045] 2. The preparation method of the wall-flow honeycomb ceramic filter body for high-temperature exhaust gas purification in this embodiment is as follows:

[0046] (1) Add Suzhou soil, alumina, and pore-forming agent into the mixer, and add hydroxypropyl methylcellulose and mix together for 60 minutes; then add cordierite and aluminum titanate and mix for 40 minutes to obtain a mixed material;

[0047] (2) Add glycerin and water to the mixed material and mix for 60 minutes to obtain mud;

[0048] (3) The mud material is prepared into a mud section through aging and vacuum mud refining, and is extruded o...

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Abstract

The invention discloses a wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, which comprises a basic material and a pore creating material; the basic material comprises 55-85 wt% of cordierite, 10-30 wt% of aluminum titanate, 2-8 wt% of Suzhou clay and 2.4-7.5 wt% of alumina; and the usage of the pore creating material is 1-3 wt% of that of the basic material. In addition, the invention further discloses a method for preparing the ceramic filter. The ceramic filter has the characteristics of thermal shock resistance, high strength, high porosity and the like, has excellent performance, and can meet the technical requirements of purification of high-temperature dust-laden exhaust gas; and furthermore, the preparation process is stable and reliable and easy to control, thereby facilitating the popularization and the application.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a wall-flow honeycomb ceramic filter body for filtering high-temperature dusty waste gas and a preparation method thereof. Background technique [0002] The purification and treatment of industrial waste gas is an environmental protection issue that all countries attach great importance to. The high-temperature dusty exhaust gas has the characteristics of high temperature (500-1200°C) and small dust particle size (5-30μm), so its purification core material needs to meet the basic requirements of high dust removal efficiency, good regeneration performance, and long service life. In addition to the requirements, it must also have excellent thermal shock resistance, high temperature resistance, acid and alkali corrosion resistance and chemical stability. Therefore, the technical requirements for the purification of high-temperature dusty waste gas are very stri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B38/02
Inventor 周健儿李家科汪永清王德林罗民华张军贵李俊
Owner GUANGDONG DOWSTONE TECH
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