Industry Knowledge of Alumina Based Refractory Castables

Alumina based refractory castables are a type of refractory material widely used in various high temperature industrial applications, such as steelmaking, cement production, and petrochemical industries. They are made from a composite of alumina, high temperature binders, and additives.

There are several levels of alumina based refractory castables, classified based on their alumina content and application temperature. Some of the common levels include low alumina (40-60%), medium alumina (60-80%), high alumina (80-90%), and super-high alumina (more than 90%). Each level has its unique properties suitable for specific industrial applications.

The technical parameters of alumina based refractory castables include bulk density, thermal conductivity, compressive strength, and service temperature. The bulk density of the material is an essential factor for determining its resistance to thermal shock and spalling during heating and cooling cycles. The thermal conductivity is indicative of its ability to resist heat transfer, while the compressive strength shows its ability to withstand mechanical pressure. The service temperature is the maximum temperature at which the material can be used without significant degradation.

The production process for alumina based refractory castables involves mixing the raw materials, such as alumina powder, binders, and additives, in a specific ratio and then adding water to form a slurry. The slurry is then poured into a mold and allowed to dry to a specific moisture content. After drying, the castable is fired in a furnace at a high temperature to create its final material structure. The final castable product is then inspected for quality before being packaged and shipped to customers.

In conclusion, alumina based refractory castables are essential materials in high temperature industrial applications. Their various levels, technical parameters, and production process make them reliable, efficient, and effective materials for furnace linings, kiln linings, and other high-temperature environments.