Mullite brick with fiber toughening and preparation method thereof

A mullite brick and fiber toughening technology is applied in the field of mullite brick with fiber toughening and its preparation, which can solve the problems of unfavorable furnace shutdown for maintenance, unfriendly environment, difficult operation, etc., and achieves improved thermal shock resistance. Performance, extended service life, easy-to-achieve results

Inactive Publication Date: 2020-07-17
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since silicon carbide is easy to oxidize under high temperature conditions, it can only be placed in a reducing atmosphere, which is not conducive to shutdown and maintenance; in addition, the preparation process of silicon carbide bricks recorded in this invention is a high-pressure and high-temperature process, which is not easy to operate and is not friendly to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of described mullite sol precursor is as follows:

[0026] 1) Weigh an aluminum salt with a weight of m, dissolve it in water with a weight of (5-10) m, and stir for 1-3 hours to obtain a clear liquid A;

[0027] 2) Add ethyl silicate to the clarified liquid A obtained in step 1), the molar ratio of ethyl silicate to aluminum salt is 3:2, and stir in a water bath at 50-80°C for 2-6 hours to obtain clarified liquid B;

[0028] 3) Add polyvinyl alcohol or its derivatives that can be hydrolyzed to the above-mentioned clear liquid B in an amount of 1% to 5% of the mass of the clear liquid B, and continue stirring for 1 to 3 hours under a water bath condition of 50 to 80°C to obtain mulai Lithium sol precursor.

[0029] The finished physical and chemical label of mullite brick is: Al 2 o 3 The mass percentage content of Fe is between 65% and 68%. 2 o 3 The mass percentage content is 1.2% to 1.5%, the apparent porosity is 15.3% to 16.8%, and the bu...

Embodiment 1

[0049] In this embodiment, the raw material composition and mass percentage of a fiber-toughened mullite brick are as follows: 30% of fused mullite with a particle size of 3-5mm, and 15% of sintered mullite with a particle size of 1-3mm 10% of andalusite with a particle size of 1-3mm, 15% of sintered mullite with a particle size of 0-1mm, 15% of sintered mullite powder with a particle size of -200 mesh, 5% of white corundum with a particle size of +350~-250 mesh, 5% of alumina micropowder with a particle size of 5-6 μm, 5% of spherical clay with a particle size of -200 mesh; add the mullite sol precursor according to 5% of the total weight of the above raw materials.

[0050] The alumina micropowder is α activated alumina micropowder.

[0051] The preparation method of described mullite sol precursor is as follows:

[0052] 1) Weigh a certain amount of aluminum salt, dissolve it in water 8 times its weight, stir for 2 hours, and obtain clarified liquid A;

[0053] 2) Add eth...

Embodiment 2

[0062] In this example, the preparation process of a fiber-reinforced mullite brick is the same as that in Example 1. The difference is that in this embodiment, the raw material composition and mass percentage of mullite bricks are as follows: 35% of fused mullite with a particle size of 3-5 mm, 10% of sintered mullite with a particle size of 1-3 mm, and 10% of sintered mullite with a particle size of 1-3 mm. 15% of 3mm andalusite, 10% of sintered mullite with a particle size of 0~1mm, 10% of sintered mullite powder with a particle size of -200 mesh, 10% of white corundum with a particle size of +350~-250 mesh, and a particle size of 5~6μm 4% of alumina micropowder, 6% of spherical clay with a particle size of -200 mesh; add mullite sol precursor according to 4% of the total weight of the above raw materials.

[0063] During the preparation process, the drying temperature is 110-120° C., and the drying time is 26 hours. The temperature of high-temperature firing is 1400-1450°...

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Abstract

The invention relates to a mullite brick with fiber toughening and a preparation method thereof. The mullite brick is prepared from the following raw materials in percentage by mass: 25%-35% of fusedmullite with a particle size of 3-5 mm; 10%-25% of sintered mullite with a particle size of 1-3 mm; 10%-20% of andalusite with a particle size of 1-3 mm; 5%-15% of sintered mullite with the particle size of 0-1 mm, 10%-20% of sintered mullite powder with the particle size of -200 meshes, 5%-10% of white corundum with the particle size of + 350 to -250 meshes, 4%-6% of aluminum oxide micro powder with the particle size of 5-6 microns and 4%-6% of ball clay with the particle size of -200 meshes. According to the preparation method, a mullite sol precursor which accounts for 4-6% of the total weight of the raw materials is added, the mullite brick provided by the invention has very high impact resistance, can effectively improve the thermal shock resistance of a fired brick, and prevents thefired brick from cracking and peeling off, thereby prolonging the service time and prolonging the service life of a lining.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a mullite brick with fiber toughening and a preparation method thereof. Background technique [0002] Dry coke quenching refers to the coke quenching method that uses inert gas (usually nitrogen) to extinguish red hot coke. It has the advantages of recycling red coke sensible heat, saving water resources, reducing environmental pollution caused by coke quenching, protecting the environment, and improving coke quality. [0003] The main equipment for CDQ is the CDQ furnace. The working environment in the CDQ furnace is harsh, especially the parts of the ring air duct and the inclined support brick (corbel). Due to the stress caused by temperature fluctuations and the pressure on the supporting upper furnace body, problems such as cracks, peeling, and collapse are very prone to occur. The present invention mainly aims at enhancing the thermal shock resistance of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185
CPCC04B35/66C04B35/185C04B2235/3463C04B2235/3217C04B2235/349C04B2235/5228C04B2235/96C04B2235/77C04B2235/9607
Inventor 杨梦
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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