Surface composite ceramic material for large coke oven and preparation method

A technology of surface composite and ceramic materials, which is applied in the field of surface composite ceramic materials for large-scale coke ovens, can solve the problems of increasing the production cost of coke enterprises, large working space of coke ovens, and general drying energy rate, and achieves thermal shock stability and Excellent resistance to penetration erosion, high product strength, and strong wear resistance

Active Publication Date: 2014-01-15
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, clay bricks, insulation bricks, cordierite brick masonry and heat-resistant and wear-resistant special alloy steel plates are commonly used in coke oven doors, flues (rising pipes and bridge pipes), coal filling holes and supporting furnace covers at home and abroad. (brick cover and furnace cover), this kind of brickwork and heat-resistant and wear-resistant special alloy steel plate generally has several shortcomings in use; the insulation effect is poor, and the heat loss is serious; moisture and acid gas and carbon and tar Strong erosion, short service life (generally 1-2 years), serious loss of refractory materials, high cost; poor integrity, poor sealing, extreme air pollution; post-maintenance labor-intensive, requiring many personnel, and high labor costs
The masonry is thick, occupying a large working space of the coke oven, and the space utilization rate is low
Average dry energy rate (coking rate) and serious waste of fuel
The above unfavorable conditions have increased the production cost of the coke company, and due to the large amount of sulfur and carbon emissions, the pollution is serious

Method used

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  • Surface composite ceramic material for large coke oven and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 61% of mullite, 26% of pre-synthesized cordierite, and 13% of binder described in the above technical scheme, put it in a forced mixer for pre-mixing for 15 minutes, and add the mixed material to 5.5% of the material weight in water (in line with drinking standards) , Continue to stir for 8 minutes, the raw materials are made into concrete slurry; the finished concrete slurry is injected into the pre-assembled mold, and the high-frequency vibration and negative pressure pouring treatment (time 7 minutes) are carried out to remove air bubbles; wet heat preservation and maintenance 24 Hours, the temperature is 15 ℃, after the solidification molding, demould; put the stripped blank in an environment with a temperature of 15 ℃ to continue wet curing for 36 hours. After curing, put it in a desiccator and dry it at room temperature -500℃ for 65 hours; spray the surface of the dried green body with microcrystalline ceramic refractory glaze with a thickness of 1.5mm. The te...

Embodiment 2

[0026] Take 65% of mullite, 21% of pre-synthesized cordierite, and 14% of binder described in the above technical scheme, put it in a forced mixer for pre-mixing for 14 minutes, add the mixed material to water of 6% by weight of the material (in line with drinking standards) , Continue to stir for 7 minutes to make the raw material into concrete slurry; pour the made concrete slurry into the pre-assembled mold, perform high-frequency vibration and negative pressure pouring treatment (time 6min) to remove bubbles; wet heat preservation 20 Hours, the temperature is 25°C, and it will be demoulded after solidification and molding; put the stripped blank in an environment with a temperature of 25°C and continue wet curing for 30 hours. After curing, put it in a desiccator and dry it at room temperature -500℃ for 70 hours; spray the surface of the dried green body with microcrystalline ceramic refractory glaze with a thickness of 2.5mm. The temperature is 25°C x 8 hours for drying. ...

Embodiment 3

[0028] Take 67% of mullite, 20% of pre-synthesized cordierite, and 13% of the aforementioned technical solution and put them into a forced mixer for pre-mixing for 13 minutes, and add the mixed material to 7% water by weight of the material (in line with drinking standards), Continue to stir for 6 minutes to make the raw materials into concrete slurry; pour the finished concrete slurry into the pre-assembled mold, perform high-frequency vibration and negative pressure pouring treatment (time 6 minutes) to remove air bubbles; wet heat preservation and curing for 20 hours , Temperature 35 ℃, demould after solidification and molding; put the stripped blank in an environment with a temperature of 35 ℃ and continue wet curing for 30 hours. After curing, put it in a desiccator and dry it at room temperature -500℃ for 75 hours; spray the surface of the dried green body with microcrystalline ceramic refractory glaze with a spray thickness of 2.0mm. The temperature is 35°C×7 hours for d...

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Abstract

The invention discloses a surface composite ceramic material with small thermal expansion coefficient, low thermal conductivity and good thermal shock stability and abrasion resistance for a large coke oven and a preparation method thereof. The surface composite ceramic material consists of mullite, pre-synthesized cordierite material and binding agent serving as raw materials. Based on the total weight of the raw materials, the surface composite ceramic material comprises the following raw materials: 60 to 67 percent of mullite, 20 to 27 percent of pre-synthesized cordierite, 12 to 16 percent of binding agent and 5 to 10 percent of water. The preparation method comprises the following steps of: mixing the raw materials, making a blank in a reduced pressure molding mode, spraying a layer of high-performance microcrystal ceramic fireproof glaze, performing high-temperature sintering, and thus obtaining the composite ceramic material.

Description

Technical field [0001] The invention relates to a surface composite ceramic material for a large coke oven, in particular to a mullite-cordierite prefabricated large brick with a layer of high-performance microcrystalline ceramic refractory glaze attached to the surface of the coke oven for baking and bonding, and a preparation method thereof. Background technique [0002] With the large-scale, environmental protection and national emission reduction requirements of coke oven types, the requirements for coke oven doors, flues (riser pipes and bridge pipes), and coal hole matching furnace covers are increasing. At present, clay bricks, insulation bricks, cordierite brick masonry and heat-resistant and wear-resistant special alloy steel plates are commonly used in coke oven doors, flues (riser pipes and bridge pipes), coal filling holes and supporting furnace covers at home and abroad. (Brick sleeve and furnace cover). This kind of brick masonry and heat-resistant and wear-resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/66C04B35/622C04B41/86
Inventor 张利新李宏伟王玉霞张燕
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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