Industry Knowledge of Andalusite Refractory Brick

Andalusite refractory brick, commonly known as red-tinted stone refractory brick, is an important material in the field of high-temperature materials. It has been widely used in the metallurgy, building materials, chemical and other industries due to its excellent thermal shock resistance, chemical and erosion resistance.

The andalusite refractory brick is divided into three grades: Al2O3 content is less than 60%, 60%-65%, and above 65%. The higher the Al2O3 content, the better the performance of the refractory brick is and the higher the price. The andalusite refractory brick is an ultra-high temperature resistant material with a maximum use temperature of up to 1750℃.

In terms of technical parameters, the andalusite refractory brick has low thermal conductivity, high compressive strength, low porosity, and good chemical stability. Its thermal conductivity is only 1/3 of the fireclay brick, and the thermal conductivity decreases with the increase of temperature. Its compressive strength is more than twice that of the fireclay brick and the porosity is lower. Therefore, it is slightly higher in price than ordinary refractory bricks, but it has a longer service life.

The production process of the andalusite refractory brick mainly includes crushing, mixing, molding, drying, and high-temperature firing. The key to its excellent performance lies in the quality of raw materials, precise control of production processes, product testing, and other links. The raw material must be carefully selected, and the mixing ratio should be calculated accurately. Then the mixed raw material is extruded, molded, and dried. Finally, it is fired at a high temperature to form a solid and durable refractory brick with excellent performance.

In summary, the andalusite refractory brick has excellent thermal shock resistance, chemical stability, and very good high-temperature resistance. It is divided into three grades according to the content of Al2O3, with each grade used for different purposes. The production process of this high-quality refractory brick is strict, and the key to its excellent performance lies in precise control, which ensures the production of high-quality and durable refractory bricks.