Industry Knowledge of Magnesia-Alumina Spinel Refractory Brick

Magnesia-alumina spinel refractory brick is a widely used refractory material in various industries, especially in the high temperature industry. As a high-grade refractory material, it has many advantages, such as excellent thermal shock resistance, high-temperature strength, and high-temperature structural stability. Here is some basic knowledge about this type of refractory brick.

Based on different production methods, magnesia-alumina spinel refractory bricks can be divided into fused cast spinel brick and burned spinel brick. According to the raw material quality, magnesia-alumina spinel refractory bricks can also be classified into high-purity type, ordinary type, and low-impurity type.

The technical parameters of magnesia-alumina spinel refractory brick include the chemical composition, bulk density, apparent porosity, cold crushing strength, modulus of rupture, and thermal shock resistance. Generally, the chemical composition of the magnesia-alumina spinel refractory brick is over 90% by weight. The bulk density is about 3.0 g/cm³, the apparent porosity is less than 5%, the cold crushing strength is more than 100 MPa, the modulus of rupture is more than 30 MPa, and the thermal shock resistance is excellent.

The production process of magnesia-alumina spinel refractory brick includes selecting high quality raw materials, crushing, ball milling, mixing, molding, drying, and firing. The raw materials are magnesia and alumina. The ratio of magnesia to alumina is critical, and the proper ratio can ensure the excellent properties of the spinel brick. The molded magnesia-alumina spinel refractory brick requires a high-temperature firing process, which is conducted in a high-temperature furnace. The temperature and time of the firing process are essential in maintaining the high-quality properties of the magnesia-alumina spinel refractory brick.

In conclusion, magnesia-alumina spinel refractory brick is an essential high-grade refractory material, which is widely used in various high-temperature industries. The production technology, technical parameters, and classification of magnesia-alumina spinel refractory brick are critical factors in ensuring its quality and performance.