Dry-quenched mullite brick and preparation method thereof

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...

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, problems such as deformation, bonding, fast wear, and peeling off are prone to occur, which reduces the service life of refractory materials.

[0004] The Chinese patent application number 201110395095.8 discloses a mullite brick for CDQ coke ovens, which uses fused mullite and natural mullite as aggregates, corundum and alumina micropowder as fine powder, And the andalusite concentrate is added to the matrix, thereby improving the thermal shock stability of the brick, and the thermal shock resistance can reach more than 30 times, but the thermal shock resistance of this patent is limited and still relatively low

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