Mullite insulation bricks are high-alumina refractory materials with mullite (Al₂O₃·2SiO₂) as the primary crystalline phase. The alumina content typically ranges from 50% to 60%. In addition to mullite, those with lower alumina content also contain small amounts of glass and cristobalite; those with higher alumina content also contain small amounts of corundum. They offer a high refractoriness, reaching temperatures exceeding 1790°C.
Performance Characteristics of Lightweight Mullite Insulation Bricks
First, lightweight mullite insulation bricks exhibit significant lightweight properties due to their light weight. With a density typically ranging from 0.6 to 1.2 g/cm³, they are lighter than traditional materials. This not only makes handling and installation easier, but also reduces the burden on the equipment itself and improves overall structural stability.
Second, lightweight mullite insulation bricks offer excellent thermal insulation performance. Its thermal conductivity is typically controlled within the range of 0.2-0.4 W/(m·K), which means it effectively blocks heat transfer and maintains a stable internal temperature in equipment. Whether used in hot air furnaces, ceramic kilns, or other high-temperature equipment, it provides excellent insulation and heat insulation, thereby improving equipment efficiency.
Furthermore, lightweight mullite insulation bricks are also highly resistant to fire. Despite their low density, they can withstand high temperatures, reaching temperatures exceeding 1300°C. This feature ensures stable performance in various high-temperature environments, providing a solid foundation for the long-term, stable operation of equipment.
Finally, lightweight mullite insulation bricks also offer excellent corrosion resistance. They can withstand various chemically aggressive environments, maintaining a long service life. Their excellent resistance to acids, alkalis, and other corrosive media ensures stable operation of equipment in a variety of complex environments.
Additionally, mullite polylightweight insulation bricks offer the advantages of lightweight insulation. Compared to traditional heavy refractory bricks, mullite polylightweight insulation bricks are lighter, making them easier to construct and install. Furthermore, their low thermal conductivity and high thermal resistance effectively reduce heat loss and lower energy consumption. In practical applications, kilns using mullite polylightweight insulation bricks often achieve the dual benefits of energy conservation and consumption reduction, while also improving production efficiency. Mullite polylightweight insulation bricks also possess excellent chemical stability. Under high-temperature conditions, they resist corrosion from various acids and alkalis, as well as oxidation reactions, maintaining stable physical properties. This ensures a long service life for mullite polylightweight insulation bricks, reduces the frequency of replacement and maintenance, and lowers operating costs.
Applications of Lightweight Mullite Insulation Bricks
As an excellent refractory material, mullite insulation bricks have proven their wide applicability in a variety of high-temperature industrial equipment. Primarily, they demonstrate excellent heat resistance and stability as lining materials in high-temperature reaction equipment such as cracking furnaces and hot blast furnaces. Mullite insulation bricks, with their excellent thermal insulation properties, ensure uniform sintering and efficient production, particularly in ceramic roller hearth kilns, electric porcelain drawer kilns, and glass crucibles.
Mullite insulation bricks also play a crucial role in more complex equipment, such as blast furnaces and glass melting furnace regenerators. Whether on the furnace roof, shaft, or floor, they effectively resist high-temperature corrosion and protect the equipment from damage. Mullite insulation bricks are particularly indispensable for the lining of petroleum cracking systems, ensuring efficient operation and long-term service life.
Mullite insulation bricks also perform exceptionally well in a variety of applications, including melting furnaces, firing kilns, flues, refining equipment, and heating equipment. They not only provide stable insulation but also improve overall equipment efficiency. Mullite insulation bricks also demonstrate their strong adaptability in regeneration equipment, gas generators, and pipelines, ensuring stable operation in high-temperature environments.