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Method for producing silicon carbide porous ceramic filtering element and extrusion apparatus

A technology for porous ceramics and filter elements, applied in ceramic products, chemical instruments and methods, filtration and separation, etc., can solve the problems of uneven pore size distribution, low strength of filter elements, difficult backflushing and cleaning, etc. The effect of high temperature and wide operating temperature range

Inactive Publication Date: 2009-04-15
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silicon carbide porous ceramic filter elements are usually produced by traditional production methods such as grouting, extrusion and isostatic pressing. Due to the limitation of process technology, the silicon carbide porous ceramic filter elements produced at present have low strength. , Uneven pore size distribution, low filtration efficiency and high production cost, especially in high temperature gas purification, it is easy to produce large pressure drop during use, difficult backflushing and cleaning, and short service life

Method used

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  • Method for producing silicon carbide porous ceramic filtering element and extrusion apparatus
  • Method for producing silicon carbide porous ceramic filtering element and extrusion apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation of vitrified bond:

[0023] Alumina and kaolin are evenly mixed at a weight percentage of 10% and 90%, and the obtained mixed powder is dry-milled in a ball mill until the particle size is less than 2 μm powder.

[0024] 2. Forming of silicon carbide porous ceramic filter element:

[0025] Mix 150μm silicon carbide powder, ceramic bond, carbon powder, carboxymethyl cellulose and water at a weight percentage of 58%, 15%, 5%, 2%, and 20%, and then knead in a mud mixer Uniformly make silicon carbide porous ceramic plastic mud, and then extrude the above silicon carbide porous ceramic plastic mud to form The silicon carbide porous ceramic plastic tube 6 is set on the mold core 4 and supported on the lower movable mold 3, and is pressed into the fixed mold 1 from the bottom of the fixed mold 1, and the upper movable mold 2 is pressed into the fixed mold 1 from the top of the fixed mold 1 1. Extrude the silicon carbide porous ceramic plastic tube 6 from both...

Embodiment 2

[0033] 1. Forming of silicon carbide porous ceramic filter element:

[0034] Mix 90μm silicon carbide powder, mullite, carbon powder, polyvinyl alcohol and water at a weight percentage of 70%, 5%, 8%, 7% and 10%, and then knead them evenly in a mud mixer Silicon carbide porous ceramic plastic mud, and then the above-mentioned silicon carbide porous ceramic plastic mud is extruded to form The silicon carbide porous ceramic plastic tube 6 is extruded from both ends of the silicon carbide porous ceramic plastic tube 6 as in Example 1, so that the lower end is flange-shaped and the upper end is a seal with a concave hole. head, and then unmold.

[0035] 3. Dry

[0036] Dry the silicon carbide porous ceramic plastic tube 6 after demoulding at 60°C for 5 hours, then at 90°C for 5 hours, and at 120°C until the water content is less than 1.5%. Silicon carbide porous ceramic filter element body.

[0037] 4. Firing

[0038] The dried silicon carbide porous ceramic filter element b...

Embodiment 3

[0042] 1. Forming of silicon carbide porous ceramic filter element

[0043] Mix 200μm silicon carbide powder, vanadium pentoxide, wood chips, oil and water at a weight percentage of 45%, 5%, 10%, 10%, and 30%, and then knead them evenly in a mud mixer to make carbonization Silicon porous ceramic plastic mud, and then the above-mentioned silicon carbide porous ceramic plastic mud is extruded to form The silicon carbide porous ceramic plastic tube 6 is extruded from both ends of the silicon carbide porous ceramic plastic tube 6 as in Example 1, so that the lower end is flange-shaped and the upper end is a seal with a concave hole. head, and then unmold.

[0044] 3. Dry

[0045] Dry the silicon carbide porous ceramic plastic tube after demoulding at a temperature of 60°C for 5 hours, then at a temperature of 90°C for 5 hours, and at a temperature of 120°C until the water content is less than 1.5%. Silicon carbide porous ceramic filter element body.

[0046] 4. Firing

[004...

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Abstract

The invention discloses a method for preparing a silicon carbide porous ceramics filtering element and squeezing equipment. The method comprises slurry preparing, forming, drying and baking, and the method is characterized by comprising the following steps: mixing silicon carbide powder of which the granularity is smaller than 200 mu m, ceramics binding agent, pore forming agent and plasticity agent according to certain proportion into a pug mill to prepare porous ceramics plasticity slurry; squeezing the porous ceramics plasticity slurry to obtain a silicon carbide porous ceramics plastic tube; filling the tube in the squeezing equipment; pressurizing two ends of the tube to form a flange at one end of the silicon carbide porous ceramics plastic tube, and to form an end enclosure at the other end; removing the die, drying to obtain silicon carbide porous ceramics filtering unit blank; and baking at certain temperature to obtain the silicon carbide porous ceramics filtering element. The silicon carbide porous ceramics filtering element has the advantages of high intensity, uniform pore diameter, high porosity, higher filtering precision and filtering efficiency, high temperature resistance, easy regeneration and repeated use, and is suitable for industrial bulk production.

Description

technical field [0001] The invention relates to a preparation method and extrusion equipment of a silicon carbide porous ceramic filter element, belonging to the technical field of porous ceramic preparation. Background technique [0002] Silicon carbide porous ceramic filter elements are usually produced by traditional production methods such as grouting, extrusion and isostatic pressing. Due to the limitation of process technology, the silicon carbide porous ceramic filter elements produced at present have low strength. , Uneven pore size distribution, low filtration efficiency and high production cost, especially in high-temperature gas purification, it is prone to large pressure drop during use, difficult backflushing cleaning, and short service life. Contents of the invention [0003] The object of the present invention is to provide a preparation method and extrusion equipment of silicon carbide porous ceramic filter element which can overcome the above defects, adap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20C04B38/06B28B21/52
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH
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