Andalusite Bricks or Mullite Bricks for Hot Blast Stove?

Hot blast stoves generally use refractory bricks as the inner lining to withstand high temperatures and chemical corrosion. When choosing the type of refractory brick, two options are usually considered, andalusite brick and mullite brick.

Andalusite bricks have high-temperature resistance and can withstand higher temperatures. They are often used in the internal lining of high-temperature industrial equipment such as hot blast stoves because of their stable performance under high-temperature conditions.

As a high-temperature structural material, hot-blast stove bricks have very strict requirements for high-temperature creep rates. Andalusite, like sillimanite, has excellent high-temperature structural strength properties. The high-temperature creep rate of andalusite brick is better than that of bauxite, corundum, and most mullite bricks. Andalusite is one of the ideal materials for low-creep refractory materials.

Mullite bricks are used in some specific cases as they perform better in chemically aggressive environments. Mullite bricks are relatively light and may be more suitable for some application scenarios that have restrictions on the weight of equipment.

Using synthetic mullite and corundum as the main raw materials, adding sillimanite and andalusite, according to the production process of high alumina bricks, mullite hot blast furnace bricks are produced. Load softening temperature and creep properties are important indicators for the use of refractory materials. The deformation and even collapse of the furnace lining during use are closely related to these properties. In high alumina refractory materials, adding andalusite or combining andalusite and sillimanite can obtain good indicators.

The choice of which refractory brick to use depends on the specific application needs, including operating temperature, chemical environment, equipment design, and other factors. Typically, engineers make selections based on these factors to ensure stove performance and durability. If you need specific advice, it is recommended to consult a refractory supplier or engineer.