High-alumina bricks are a type of refractory material primarily composed of aluminum oxide (Al₂O₃).
Bricks with an Al₂O₃ content exceeding 90% are classified as corundum bricks. Standards vary by country due to differences in available resources; for instance, European standards set the minimum Al₂O₃ content for high-alumina refractories at 42%. In China, high-alumina bricks are typically categorized into three grades based on Al₂O₃ content: Grade I (>75%), Grade II (60–75%), and Grade III (48–60%).
These are aluminosilicate refractory products with an aluminum oxide (Al₂O₃) content exceeding 48%.
They are a type of neutral refractory material with an alumina content of over 48%, manufactured by shaping and calcining bauxite or other raw materials rich in alumina. They exhibit high thermal stability and a refractoriness exceeding 1770°C. With good slag resistance, they are used to line electric steelmaking furnaces, glass melting furnaces, and cement rotary kilns.
High-load-softening, low-creep high-alumina bricks [1] are premium refractory materials made primarily from special-grade bauxite, fused corundum, and fused mullite. These bricks offer advantages such as low high-temperature creep, strong erosion resistance, and excellent thermal shock stability.
Suitable for large and medium-sized hot blast stoves, they represent a successful step toward the domestic production of the high-quality, high-grade refractory materials previously imported for my country's new-generation hot blast stoves; this product has been included in the national "Spark Program."