Industry Knowledge of Mullite Refractory Castables

Mullite refractory castables are commonly used in the high-temperature industries such as metallurgy, cement, and chemical engineering. This material exhibits high thermal shock resistance, excellent erosion resistance, and good thermal insulation properties.

Mullite refractory castables are classified into different grades based on their alumina and mullite content. The most commonly used grades are low-alumina, medium-alumina, and high-alumina mullite castables. The selection of a specific grade depends on the operating temperature and the application requirements.

The technical parameters of mullite refractory castables include compressive strength, flexural strength, apparent porosity, bulk density, and thermal conductivity. These parameters are determined by the production process, the raw materials used, and the curing conditions. Optimal technical parameters can be achieved by controlling the formulation and curing conditions of the castable.

The production process of mullite refractory castables involves mixing the raw materials, shaping the castable, and curing it at high temperatures. The raw materials used include calcined bauxite, mullite, alumina powder, silica powder, and other additives. The mixing process involves wet or dry mixing, and the shaped castable can be formed by casting or gunning. The final step involves the curing of the castable at high temperatures, which can range from 1000℃ to 1600℃ depending on the grade of the castable.

Mullite refractory castables have been widely used in various high-temperature industries due to their excellent thermal properties and high durability. With the advancement of technology, the production process of mullite refractory castables has become more efficient and the technical parameters have been constantly improved. The application of mullite refractory castables will continue to contribute to the development of high-temperature industries.