High Alumina Refractory Bricks for Industrial Furnaces - China Suppliers & Factory
Features
- High Refractoriness: They can withstand very high temperatures, making them suitable for use in furnaces and other high-temperature environments.
- Excellent Thermal Stability: These bricks maintain their structural integrity and mechanical properties even under rapid temperature changes, reducing the risk of thermal shock damage.
- Good Insulating Properties: While not as effective as specialized insulating materials, high alumina bricks offer some insulation against heat transfer, helping to conserve energy in industrial applications.
- Resistance to Corrosion and Abrasion: They are resistant to chemical corrosion and mechanical wear, prolonging their lifespan in harsh operating conditions.
- Low Thermal Conductivity: This property helps to minimize heat loss and maintain consistent temperature profiles within the refractory lining.
Application
High alumina bricks are commonly used in industries such as steel, cement, glass, and ceramics for their ability to withstand extreme temperatures and harsh conditions. Masonry blast furnace, hot blast stove, electric furnace top and ladle permanent lining.
Main physical and chemical performance index
| Index | LZ-75 | LZ-65 | LZ-55 | LZ-48 |
|---|---|---|---|---|
| Al2O3 % ≥ | 75 | 65 | 55 | 48 |
| Refractoriness ℃ ≥ | 1790 | 1790 | 1770 | 1750 |
| Refractoriness under load (0.6%) ℃ ≥ | 1520 | 1500 | 1470 | 1420 |
| Permanent linear change (1500℃×2h) % | +0.1~-0.4 | +0.1~-0.4 | +0.1~-0.4 | +0.1~-0.4 (1450℃) |
| Apparent porosity % | 23 | 23 | 22 | 22 |
| CCS MPa ≥ | 53.9 | 49 | 44.1 | 39.2 |
Frequently Asked Questions
What are the primary applications of High Alumina Bricks?
High alumina bricks are widely used in high-temperature industries including steel, cement, glass, and ceramics. Specifically, they are used for masonry blast furnaces, hot blast stoves, electric furnace tops, and ladle permanent linings.
What is the refractoriness range of these bricks?
Depending on the specific grade (from LZ-48 to LZ-75), the refractoriness of these bricks ranges from ≥1750℃ up to ≥1790℃.
How does the Al2O3 content vary among different models?
The Al2O3 percentage varies by model grade: LZ-75 contains ≥75%, LZ-65 contains ≥65%, LZ-55 contains ≥55%, and LZ-48 contains ≥48% Al2O3.
Do High Alumina Bricks offer good thermal shock resistance?
Yes, they possess excellent thermal stability, allowing them to maintain structural integrity and mechanical properties even under rapid temperature fluctuations.
Are these bricks resistant to wear and chemical attack?
Yes, high alumina bricks feature high resistance to chemical corrosion and mechanical abrasion, which significantly extends their service life in harsh operating environments.