Industry Knowledge of Corundum Refractory Aggregate

Corundum refractory aggregate is a widely used material in the refractory industry due to its excellent heat resistance, chemical resistance, and mechanical properties. Corundum is an oxide mineral that consists of aluminum and oxygen, and it is known for its hardness and durability.

There are several grades of corundum refractory aggregate, and they are classified based on their alumina content. High-purity corundum (>99.5% Al2O3) is used in the production of advanced ceramics, while lower-grade corundum (85-95% Al2O3) is used in the production of refractory bricks, castables, and other materials that are exposed to high temperatures and harsh environments.

The technical parameters of corundum refractory aggregate are crucial in determining its suitability for various applications. These parameters include particle size distribution, bulk density, apparent porosity, cold crushing strength, thermal shock resistance, and creep resistance. In general, corundum refractory aggregate with higher alumina content has better technical properties and is more expensive.

The production of corundum refractory aggregate involves several stages, including raw material preparation, shaping, drying, and firing. The raw materials are calcined at high temperatures to remove impurities and create the desired alumina composition. The shaped products are then fired at high temperatures to achieve the desired density, strength, and thermal stability.

Corundum refractory aggregate has a wide range of applications in the steel, cement, glass, and petrochemical industries. It is used to line furnaces, kilns, and reactors that operate at temperatures above 1500°C. Other applications include the production of refractory coatings, crucibles, and nozzles for molten metal handling.

In conclusion, corundum refractory aggregate is an important material in the field of refractory technology. Its excellent technical properties, high purity, and wide range of applications make it an indispensable component in many high-temperature processes. The industry must continue to make advancements in production techniques and product design to improve the performance and cost-effectiveness of this critical material.