Wall-flow honeycomb ceramic filter

A technology of honeycomb ceramics and filter body, which is applied in the direction of filtration and separation, ceramic molding machines, mechanical equipment, etc., can solve the problems of high thermal expansion coefficient and mechanical strength, and achieve good results

Active Publication Date: 2009-12-30
NANJING KERUI SPECIAL CERAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the thermal expansion coefficient of the existing wall-flow honeycomb ceramics is large, and the mechanical strength needs to be improved, especially for large-scale wall-flow honeycomb ceramics. The wall-flow honeycomb ceramic filter body needs to be improved.

Method used

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Examples

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Embodiment Construction

[0019] Wall-flow honeycomb ceramic filters such as figure 1 , figure 2 Shown: 1 is the outermost wall, 2 is the closed cell at the end, 3 is the opening at the end, and 4 is the filter wall.

[0020] The embodiment of the wall-flow honeycomb ceramic filter body includes raw material processing, molding and firing, and the specific technical route is as follows (see image 3 ):

[0021]First, 35-45 parts of kaolin, with an average particle size of ≤5μm, 20-30 parts of talc, with an average particle size of 15μm, 4-9 parts of α-alumina, with an average particle size of ≤2μm, a pore-forming agent (including carbon particles or organic High polymer molecular particles can also be a mixture of the two, and the weight ratio of the two mixtures is 2-8:8-2; carbon particles can be used alone, including coal powder, etc., and organic polymer particles can be used alone, including a variety of polymer particles. Or fibrous polymers, such as polyethylene, polypropylene, polyester, al...

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Abstract

The invention relates to a wall-flow honeycomb ceramic filter, which combines a cordierite honeycomb ceramics material and a special pore-forming agent. Raw materials of a blank of the filter comprise the following components, mass portions and grain diameters: kaolin is 35 to 45 portions, and the average grain diameter is less than or equal to 5 mu m; talcum is 20 to 30 portions, and the average grain diameter is 15 mu m; alpha-alumina is 4 to 9 portions, and the average grain diameter is less than or equal to 2 mu m; the pore-forming agent consisting of carbon granules or/and organic polymeric particles is 5 to 15 portions, and the average grain diameter is 10 to 20 mu m; and a bonding agent is 3 to 7 portions. A method for preparing the wall-flow honeycomb ceramic filter comprises the following steps: evenly mixing the components and 20 to 30 portions of water to prepare a blank; completing the conversion from the blank to plastic mud after performing vacuum degassing for 2 to 3 times; staling the plastic mud for 24+/-8 hours, and squeezing out the plastic mud through a mould of an extruder, wherein the density of mould holes is 100 to 250 holes per square inch; cutting the mud after extrusion into a wet blank with certain length; and performing microwave drying on the wet blank to obtain a dry blank, performing cross hole blocking and drying on the dry blank, and finally performing a sintering working procedure on the dry blank to manufacture a product.

Description

technical field [0001] The invention relates to a wall-flow honeycomb ceramic filter body for trapping diesel engine exhaust particles. technical background [0002] The wall-flow honeycomb ceramic filter is the most commonly used diesel particulate filter (DPF for short). The purpose of filtering particles (see figure 2 ), the filtration efficiency can exceed 90%. Diesel engine exhaust contains a large number of particles, which are small in size and light in weight. They can be suspended in the atmosphere for a long time, and are easily absorbed by the human body and deposited in the alveoli. They are an important source of pollution in cities and towns. However, due to the economy, strong power, good performance and long lifespan of diesel vehicles, diesel vehicles have become a key vehicle for future development at home and abroad. In order to improve the environmental protection performance of diesel vehicles, a lot of work has been carried out on the research and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20B28B3/20B28B11/00F01N3/022
Inventor 孔德双谷昌军孔秋明李建国郑南孔令仁
Owner NANJING KERUI SPECIAL CERAMICS
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