What is alumina-silica refractory brick?

2024-02-20 16:27:00
Aluminum-silicon refractory bricks, for people who don’t know the refractory industry, maybe this is a refractory brick containing aluminum and silicon, but for people in the refractory industry, there is no such name, only aluminum-silicon Made of refractory bricks. So, what is aluminum-silicon refractory brick? What is aluminum-silicon refractory brick? First of all, let’s look at the definition. What does aluminum-silicon refractory brick mean?

Aluminum-silicon refractory bricks, also called aluminum-silicon refractory bricks, are refractory products containing Al2O3 and SiO2. They are a series of aluminum-silicon refractory bricks. Aluminum-silicon refractory bricks have a wide range of applications and occupy a very important position in the refractory application industry. Their usage accounts for more than 40% of the entire refractory products.

From a definition point of view, aluminum-silicon refractory bricks are a series, which includes multiple types of refractory bricks. Below we will classify them to give you a deeper understanding.

Aluminum-silicon refractory bricks are classified according to the increasing order of composition from SiO2 content to Al2O3 content:
(1) Silica brick: SiO2 content ≥93%;
(2) Semi-silica brick: Al2O3 content is 15%-30%;
(3) Clay brick: Al2O3 content is 30%-48%;
(4) High alumina brick: Al2O3 content ≥ 48%;
(5) Mullite bricks: Al2O3 content ≥72%, SiO2 content ≥28%;
(6) Corundum brick: Al2O3 content ≥90%.

It can be seen from the classification that silica bricks, clay bricks, and high alumina bricks are commonly used refractory bricks in kilns, and are often used to build the working layer and permanent layer of the kiln. Below we will introduce the application of aluminum-silicon refractory bricks.

Refractory bricks and application scope

Silica bricks: partition walls and linings of coke oven carbonization chambers and combustion chambers, hot blast furnace roofs and regenerator linings, small electric furnace roof masonry, glass kiln roofs, acid steelmaking furnaces and firing kiln arches Top bit.

Semi-silica bricks: mainly used in coke ovens, acidified iron furnaces, metallurgical furnace flues, ladle (ladle) linings, hot metal tanks, glass kilns, heating furnaces, hot blast furnace tops, boiler combustion chambers, etc. Semi-silica bricks are not only used in these parts, but can also be used as raw materials to make better quality refractory materials, such as flowing steel bricks.

Clay bricks: Clay bricks are used to build heating furnaces and heat treatment furnaces, flues, open-hearth regenerator checker bricks and the bottom of regenerator walls, linings of air ducts and gas ducts, dust collectors of iron-making furnaces, and flues It is also a commonly used refractory material in boilers, lime kilns, glass kilns, ceramic kilns and other kilns.

High alumina bricks: used to build blast furnaces, hot blast stoves, ladles, rotary kiln linings and other metallurgical kilns. High alumina bricks can also be used as checker bricks on hot blast stoves to build regenerators.

Mullite bricks: Mullite bricks are commonly used in high-temperature iron-making hot blast stoves above 1200°C, torpedo tank cars where molten iron impacts, slag lines, the top of steel-making electric arc furnaces, ceramic industrial kilns, and the regenerators of glass melting furnaces. Arch, superstructure, cement, rotary kiln lining, etc.

Corundum bricks: used in blast furnaces, hot blast furnaces, refining furnaces in the metallurgical industry, secondary furnaces, gasification furnaces, gas generating furnaces, cracking furnaces in the petrochemical industry, and various high-temperature heating furnaces in ceramics, building materials and other industries.

From the table above, we can see the application of aluminum-silicon refractory bricks in various kilns. One type of refractory brick can be used in a variety of thermal kiln equipment, and one type of kiln requires a variety of refractory bricks. Therefore, when users communicate with refractory material manufacturers about information about aluminum-silicon refractory bricks, they must determine the use location and use environment to facilitate the selection of the correct silicon-aluminum refractory bricks.
Good quality refractory bricks are the basic condition for increasing the service life of the kiln lining. The service model of the refractory material manufacturer is to reduce the user's expenditure on refractory materials.
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