Dry-quenched mullite brick and preparation method thereof

A mullite brick and coke CDQ technology, which is applied in the field of CDQ mullite brick and its preparation, can solve the problem that the coke quenching process of CDQ coke oven is not satisfied, the strength and wear resistance are not too high, and the fire resistance is reduced. The service life of materials and other issues can be improved to improve high-temperature volume stability and high-temperature performance, improve thermal shock resistance, and increase strength.

Active Publication Date: 2015-07-01
HUNAN XIANGGANG RUITAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the traditional refractory materials, ordinary clay bricks have average thermal shock resistance, but low density and poor wear resistance; ordinary high-alumina bricks have improved wear resistance, but poor thermal shock resistance; conventional mullite bricks have improved thermal shock resistance but low strength. The wear resistance is not too high; the ordinary corundum brick has good wear resistance but poor thermal shock resistance
The above-mentioned refractory materials have their own advantages and disadvantages, and cannot meet the coke quenching process of CDQ coke ovens. During use, prob

Method used

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  • Dry-quenched mullite brick and preparation method thereof
  • Dry-quenched mullite brick and preparation method thereof
  • Dry-quenched mullite brick and preparation method thereof

Examples

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preparation example Construction

[0032] The application also provides a preparation method for CDQ coke mullite bricks, comprising the following steps:

[0033] 5wt% to 10wt% super high alumina, 45wt% to 55wt% sintered mullite, 5wt% to 15wt% andalusite, 5wt% to 10wt% white coke gem, 12wt% to 18wt% sillimanite , 2wt% to 6wt% of alumina, 2wt% to 8wt% of clay are mixed with pulp water to obtain mud;

[0034] The mud is pressed into shape and then dried, and the dried brick adobe is fired to obtain CDQ coke mullite bricks.

[0035] In the process of preparing CDQ coke-mullite bricks, the present application firstly prepares mud material mixed with raw materials, and then compresses, dries and burns the mud material to obtain CDQ coke-mullite bricks.

[0036] In the process of preparing CDQ coke mullite bricks, based on sintered mullite, the sintered mullite preferably contains 11wt% to 21wt% of sintered mullite particles with a particle size of 3 to 5mm, and 28wt% ~38wt% of sintered mullite particles with a par...

Embodiment 1

[0049] The CDQ coke-mullite brick of the present invention is represented by weight percentage. The CDQ coke-mullite brick is composed of 7% super high alumina, 51% all-natural sintered mullite, 10% andalusite, white coke gem 8%, sillimanite 15%, alumina micropowder 4% and bonded clay 5%.

[0050] Among them, the super high alumina is 5~3mm pellets from Shanxi rotary kiln, 51% of all natural sintered mullite is made of 8% sintered mullite pellets with a particle size of 5~3mm, 17% sintered mullite pellets with a particle size of 3~1mm 10% sintered mullite granules with a particle size of 1-0 mm and 16% sintered mullite fine powder with a particle size of -200 mesh. The andalusite is composed of 5% andalusite granules with a particle size of 3-1mm and 5% andalusite granules with a particle size of 1-0mm, and is produced in South Africa. The white burnt gemstone is YNS44 grade, and the particle size is 3-1mm. The sillimanite is Lingshou sillimanite with a particle size of -200...

Embodiment 2

[0066] The same as Example 1, the difference is that: CDQ coke-mullite brick of the present invention, represented by weight percent, consists of 10% super-high alumina, 49% all-natural sintered mullite, 13% andalusite, and white coke gem 6%, sillimanite 13%, alumina micropowder 5% and bonded clay 4%.

[0067] Among them, the all-natural sintered mullite is composed of 6% sintered mullite particles with a particle size of 5-3mm, 14% sintered mullite particles with a particle size of 3-1mm, 12% sintered mullite particles with a particle size of 1-0mm and 17% % Granularity - Composition of 200 mesh sintered mullite fine powder. The andalusite is composed of 8% andalusite granules with a particle size of 3-1mm and 5% andalusite granules with a particle size of 1-0mm, and its origin is Xinjiang. Alumina micropowder is active type with a particle size of -5μm. The combined clay is Suzhou white clay with a particle size of -200 mesh. The properties of the CDQ pyromullite bricks p...

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Abstract

The invention provides a dry-quenched mullite brick and a preparation method thereof. The dry-quenched mullite brick comprises the following components in percentage by weight: 5wt%-10wt% of special grade high aluminum, 45wt%-55wt% of sintered mullite, 5wt%-15wt% of andalusite, 5wt%-10wt% of white flint clay, 12wt%-18wt% of sillimanite, 2wt%-6wt% of alumina and 2wt%-8wt% of clay. According to the preparation method, special grade high aluminum, sintered mullite, white flint clay and andalusite are taken as aggregates, and microcracks in an organization structure of the dry-quenched mullite brick are toughened, so that the thermal shock stability is improved; furthermore, by virtue of primary mullitization and secondary mullitization of andalusite and sillimanite at different temperatures, the high-temperature volume stability and high-temperature performance of the dry-quenched mullite brick are improved. According to the dry-quenched mullite brick, the apparent porosity is lower than 16%, the compression strength is higher than 90MPa, the wear resistance is smaller than 4cm<3>, and the thermal shock property is higher than 40 times.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a CDQ coke-mullite brick and a preparation method thereof. Background technique [0002] CDQ technology is a coke quenching process that uses inert gas to cool red coke. During the CDQ process, the red coke is loaded from the top of the CDQ furnace, and the low-temperature inert gas is blown into the red coke layer in the cooling section of the CDQ furnace by the circulating fan to absorb the sensible heat of the red coke, and the cooled coke is discharged from the CDQ furnace. Exhausted from the bottom, the high-temperature inert gas coming out of the CDQ furnace annular flue flows through the CDQ process boiler for heat exchange, the boiler generates steam, and the cooled inert gas is re-blown into the CDQ furnace by the circulating fan, and the inert gas is blown into the CDQ furnace in a closed It is recycled in the system. Dry coke quenching process is superio...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185C04B35/622
Inventor 朱新军章兴高唐安山曾立民刘利华曾昆
Owner HUNAN XIANGGANG RUITAI TECH
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