Industry Knowledge of Magnesia-Alumina Spinel Refractory Brick

Magnesia-alumina spinel refractory brick is a high-quality refractory material that is widely used in various high-temperature industrial furnaces due to its excellent properties. As a unique type of refractory brick, it has a wide range of applications in the metallurgical, cement, glass, and petrochemical industries, as well as in other high-temperature industries.

Magnesia-alumina spinel refractory brick can be classified into two main categories: direct-bonded and rebonded. The direct-bonded type is made by sintering a mixture of magnesia and alumina at high temperature, while the rebonded type is produced by firing spinel fragments and then bonding them together with magnesia cement. The direct-bonded type is further classified into different grades based on its MgO content, ranging from 60-90%.

Magnesia-alumina spinel refractory brick has a high refractoriness, as well as high resistance to corrosion and erosion. It also has low thermal conductivity and good thermal shock resistance. The direct-bonded type has a higher density and strength, while the rebonded type has a lower thermal expansion coefficient. The main technical parameters of magnesia-alumina spinel refractory brick are bulk density, porosity, compression strength, thermal shock resistance, and chemical composition.

The production process of magnesia-alumina spinel refractory brick involves several steps, including raw material selection, mixing, shaping, drying, firing, and testing. The raw materials used in the production of the direct-bonded type are high-purity magnesia and alumina, which are mixed in a specific ratio and then shaped into bricks using a hydraulic press. The bricks are then fired at a high temperature to achieve the required strength and density. The rebonded type, on the other hand, is produced by using spinel fragments and magnesia cement, which are mixed and then shaped into bricks. The bricks are then fired at a lower temperature to achieve the required strength and thermal expansion coefficient.

In conclusion, magnesia-alumina spinel refractory brick is a high-quality refractory material with excellent properties, widely used in high-temperature industrial furnaces. Its classification, technical parameters, and production process are all essential aspects of the industry knowledge. As our technology continues to improve, we will undoubtedly see more advancements and innovative uses for this versatile product.