Hot Products
0102030405
High Alumina Refractory Bricks from China - Reliable Suppliers and Quality Factory for Industrial Furnaces
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 features of high alumina bricks?
High alumina bricks feature high refractoriness, excellent thermal stability, good insulating properties, resistance to corrosion and abrasion, and low thermal conductivity. These qualities make them highly durable and reliable in extreme industrial environments.
Where are high alumina bricks typically applied?
They are commonly used in industries such as steel, cement, glass, and ceramics. Specific applications include masonry blast furnaces, hot blast stoves, electric furnace tops, and ladle permanent linings.
What is the refractoriness limit of these bricks?
The refractoriness varies by grade. LZ-75 and LZ-65 grades have a refractoriness of ≥ 1790 ℃, while LZ-55 is ≥ 1770 ℃ and LZ-48 is ≥ 1750 ℃.
How do different grades of high alumina bricks perform under load?
The refractoriness under load (0.6% deformation) ranges from ≥ 1420 ℃ for the LZ-48 grade up to ≥ 1520 ℃ for the LZ-75 grade, ensuring reliable structural support at high temperatures.
What is the mechanical strength (CCS) of these bricks?
The Cold Crushing Strength (CCS) ranges from ≥ 39.2 MPa for LZ-48 to ≥ 53.9 MPa for LZ-75, indicating high resistance to compressive loads.