Corundum Brick

Corundum bricks, also known as alumina bricks or mullite-corundum bricks, are a type of refractory brick made from a combination of corundum (α-Al2O3), mullite (3Al2O3·2SiO2), and other additives.

Corundum bricks, also known as alumina bricks or mullite-corundum bricks, are a type of refractory brick made from a combination of corundum (α-Al2O3), mullite (3Al2O3·2SiO2), and other additives. They are known for their exceptional properties, including:

• High refractoriness: Corundum bricks have a high melting point, typically around 1750°C (3182°F), making them suitable for use in high-temperature applications such as steelmaking, cement production, and glass melting.

• Superior thermal shock resistance: Corundum bricks are resistant to cracking and spalling due to rapid changes in temperature. This is because the mineral corundum has a relatively low thermal expansion coefficient.

• Excellent chemical stability: Corundum bricks are resistant to corrosion from a variety of slags, chemicals, and molten materials. This is because the alumina and mullite in the bricks react with the slags and chemicals to form stable compounds.

• High strength and durability: Corundum bricks are strong and can withstand the high stresses that are encountered in industrial applications.

• Relatively low cost: Corundum bricks are relatively inexpensive compared to other types of refractory bricks, such as magnesia bricks.

Applications of Corundum Bricks

Corundum bricks are used in a wide variety of industrial applications, including:

• Steelmaking: Corundum bricks are commonly used in the linings of steelmaking converters, such as basic oxygen furnaces (BOFs) and electric arc furnaces (EAFs). They are also used in the linings of ladles and tundishes, which are used to transport and pour molten steel.

• Cement production: Corundum bricks are used in the linings of cement kilns, where they are exposed to high temperatures and corrosive clinker.

• Glassmaking: Corundum bricks are used in the melting chamber of glass melting furnaces, where they are exposed to high temperatures and molten glass.

• Other applications: Corundum bricks are also used in a variety of other industrial applications, such as the incineration of hazardous waste, the production of non-ferrous metals, and the petrochemical industry.

Manufacturing of Corundum Bricks

Corundum bricks are typically made by the following process:

1. Raw material preparation: The raw materials, which are typically corundum powder, mullite powder, and other additives, are mixed together with water to form a slurry.

2. Forming: The slurry is poured into molds and allowed to dry.

3. Firing: The dried bricks are fired in a kiln at a temperature of 1600-1750°C (2912-3182°F).