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Tough mullite bricks for warm air ducts

A technology of hot air ducts and mullite bricks, applied in the field of refractory materials, can solve problems such as accidents, short life of hot air ducts, and easy redness, etc., to meet the requirements of longevity, good toughness, thermal volume stability, and resistance to CO erosion sex unaffected by the effect

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AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of short service life, easy redness, deformation and even accidents of the hot air duct, the invention provides a tough mullite brick for the hot air duct

Method used

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  • Tough mullite bricks for warm air ducts

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the examples.

[0015] The technical solution adopted in the present invention is: a tough mullite brick for a hot air duct, which is calculated by weight: 5-40% of sintered mullite, 5-30% of sillimanite, 5-30% of andalusite, slab It is made of 5-30% corundum, 4-15% toughness additives and 3-10% bonded clay.

[0016] The preferred proportion by weight is: 30% of sintered mullite, 20% of sillimanite, 12% of andalusite, 20% of platy corundum, 10% of toughness additive and 8% of bonded clay. The thickness of the toughness additive is 1-10mm.

[0017] For the main raw materials, we use mullite and andalusite and other materials with high purity, creep resistance, thermal shock stability and stable linear change performance to control the index range of products to adapt to the working environment of pipeline lining; we introduce special additives In the high-temperature sintering reaction of the pro...

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Abstract

The invention discloses tough mullite bricks for warm air ducts, which are characterized by being prepared from 5 to 40 weight percent of sintered mullite, 5 to 30 weight percent of sillimanite, 5 to 30 weight percent of andalusite, 5 to 30 weight percent of platy corundum, 4 to 15 weight percent of tough additive and 3 to 10 weight percent of binding clay. The tough mullite bricks combine the high performance of low-creep bricks, andalusite bricks, mullite bricks and the like for blast ovens, and have high toughness, thermal volume stability, thermal shock resistance (the thermal shock resistance under water cooling temperature of 1,100 DEG C is more than or equal to 40), wear resistance and corrosion resistance at high temperature, low impurity content and other high performance. Meanwhile, the product has CO corrosion resistance and therefore can meet the requirements of large and medium warm air ducts of blast furnaces for long life.

Description

technical field [0001] The invention relates to a ductile mullite brick for a hot air duct, which belongs to the field of refractory materials. Background technique [0002] The ironmaking blast furnace hot blast pipeline is the hot blast channel connecting the hot blast stove and the blast furnace, and is a key facility for blast furnace smelting. In recent years, Ruiwo Refractory has noticed that the refractory lining in the hot blast main pipe cracked, Peeling off, or even a large area of ​​falling off, caused serious problems such as redness, deformation and even accidents of the pipe shell, forcing the ironworks to use water to reduce the wind temperature and pressure for emergency, and then poured by grouting or partially opening the shell. But these are temporary remedial measures and cannot fundamentally solve the problem. The hot blast pipeline has become a time bomb between the hot blast furnace and the blast furnace, which poses a serious threat to the normal sme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 丁丰收郭长江
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