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High Alumina Refractory Bricks from China Suppliers - Durable Solutions for Industrial Furnace Needs
Features
- 1. High Refractoriness: They can withstand very high temperatures, making them suitable for use in furnaces and other high-temperature environments.
- 2. Excellent Thermal Stability: These bricks maintain their structural integrity and mechanical properties even under rapid temperature changes, reducing the risk of thermal shock damage.
- 3. 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.
- 4. Resistance to Corrosion and Abrasion: They are resistant to chemical corrosion and mechanical wear, prolonging their lifespan in harsh operating conditions.
- 5. Low Thermal Conductivity: This property helps to minimize heat loss and maintain consistent temperature profiles within the refractory lining.
Overall, high alumina bricks are valued for their durability, reliability, and ability to withstand extreme conditions in various industrial processes.
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 advantages of high alumina bricks?
High alumina bricks offer high refractoriness, excellent thermal stability, good insulating properties, low thermal conductivity, and outstanding resistance to corrosion and abrasion in harsh high-temperature environments.
In which industries and applications are these bricks commonly used?
They are widely used in the steel, cement, glass, and ceramics industries. Typical applications include masonry blast furnaces, hot blast stoves, electric furnace tops, and ladle permanent linings.
How does the Al2O3 content vary across different product models?
The Al2O3 percentage ranges from ≥ 48% for the LZ-48 grade, up to ≥ 75% for the high-performance LZ-75 grade.
What is the refractoriness limit for these bricks?
The refractoriness limit is ≥ 1750℃ for LZ-48, ≥ 1770℃ for LZ-55, and reaches up to ≥ 1790℃ for both LZ-65 and LZ-75 models.
What is the Cold Crushing Strength (CCS) of the LZ-75 brick?
The LZ-75 brick features a Cold Crushing Strength (CCS) of ≥ 53.9 MPa, providing excellent load-bearing capabilities and structural durability.