High Alumina Bricks for Hot Blast Stoves

The commonly used refractory bricks in hot blast stoves mainly include silica bricks, high alumina bricks, clay bricks, mullite bricks, etc. Each hot blast stove may be different depending on the use. However, the main selection of refractory materials for hot blast stoves it is determined by the hot air temperature of the hot blast furnace. Generally, when the air temperature is less than 900°C, clay bricks are often used. When the air temperature is between 900 and 1100°C, the furnace lining and checker bricks in the high-temperature part are made of high alumina bricks and molybdenum bricks. Laminated bricks or sillimanite bricks; when the wind temperature is higher than 1100°C, high alumina bricks, mullite bricks, and silica bricks are generally used as furnace lining or grid bricks. But the overall difference is not bad. Today we focus on high alumina bricks for hot blast furnaces.

High alumina bricks in hot blast stoves are often used in checkered bricks on the upper part of hot blast stoves, rotating bricks on vaults, and large walls, that is, in high-temperature parts of hot blast stoves. Our commonly used high alumina bricks generally include first-level high alumina bricks, second-level high alumina bricks, and third-level high alumina bricks. Grade-high alumina bricks, mullite bricks, etc. Each high alumina brick has a different alumina content, so it will be used in different parts of the hot blast stove according to the temperature distribution of the hot blast stove. Due to its high aluminum content, the material has good fire resistance, high-temperature resistance, and corrosion resistance. These characteristics make high alumina bricks one of the ideal choices for hot blast furnaces.

When selecting high-alumina bricks for hot blast stoves, the high-temperature creep properties of refractory bricks must be taken into consideration to ensure production safety in long-term work. Therefore, we must select each part in the early stage and choose different varieties and brands of refractory bricks. The selection of refractory materials used in various parts of the hot blast stove is based on the temperature of the heating surface where it is located, and it can work stably for a long time under load-bearing conditions.

Our country’s blast furnace hot blast stoves are generally internal combustion type, and their linings and checker bricks are generally built with high alumina bricks and clay bricks; the high-temperature parts of external combustion hot blast stoves are generally built with silica bricks, and the medium and low-temperature parts are made of high-aluminum bricks in turn. Aluminum bricks and clay bricks.