High alumina bricks are one of the most widely used refractory materials in high-temperature industrial environments. Characterized by superior refractoriness, mechanical strength, and chemical stability, high alumina bricks are indispensable for lining applications across steel mills, cement plants, glass furnaces, and petrochemical facilities. Their classification by alumina content makes them suitable for diverse operating conditions from 1300°C to 1800°C.
High Alumina Brick Classification
High alumina bricks are classified by alumina content, which typically ranges from 45% to over 90%. Higher alumina content delivers greater refractoriness under load, better corrosion resistance, and improved high-temperature performance:
- Grade I (Al2O3 content ≥75%): High-grade applications including blast furnace hearth, hot blast stove dome, and cement kiln burning zone. Refractoriness under load exceeds 1530°C.
- Grade II (Al2O3 content 60-75%): Standard applications including blast furnace shaft, EAF sidewall, and cement kiln transition zone. Refractoriness under load 1450-1530°C.
- Grade III (Al2O3 content 48-60%): Lower temperature applications including boiler lining, heat treatment furnace, and general industrial furnace backup lining.
CH Refractories High Alumina Product Range
CH Refractories supplies a complete range of high alumina brick products for steel and cement industry applications:
- Low Creep High Alumina Brick for blast furnace hot blast stove and EAF applications. Engineered for superior creep resistance at temperatures up to 1600°C.
- Low Creep Andalusite Brick for blast furnace and hot blast stove service. Optimized for thermal shock resistance in cyclic temperature zones.
- High Alumina Brick (Grade I/II/III) for general industrial furnace and boiler applications.
- High Alumina Insulation Brick for backup lining and energy-efficient applications.
Steel Industry Applications
In steel industry, high alumina bricks serve critical zones in blast furnaces, hot blast stoves, EAFs, and steel ladles:
- Blast Furnace Hearth: Grade I high alumina brick with low creep formulation provides 15+ years service life under extreme thermal stress and molten iron contact.
- Hot Blast Stove Dome: Grade I-II brick resists 1300-1500°C operating temperatures and thermal cycling between hot blast and cold blast phases.
- EAF Sidewall and Hot Spots: Grade I brick with optimized creep resistance withstands 1600°C+ peak temperatures during oxygen injection.
Cement Industry Applications
In cement industry, high alumina bricks serve burning zone, transition zone, and cooler zones:
- Cement Kiln Burning Zone: Grade I brick (alumina content ≥70%) withstands 1600°C and alkali attack from cement raw materials.
- Transition Zone: Grade II-III brick balances thermal shock resistance and abrasion resistance.
- Cooler: Grade III brick provides abrasion resistance for cooler zones experiencing clinker material impact.
High alumina brick selection requires balancing three factors: alumina content for refractoriness, creep resistance for high-temperature structural stability, and alkali resistance for service environment compatibility.
Contact CH Refractories for high alumina brick selection and engineering consultation for your specific operating conditions.
CH Refractories Engineering Team
40+ years of refractory engineering experience · Steel · Cement · Glass · Nonferrous