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High Alumina Refractory Bricks for Industrial Furnaces from China Suppliers and Factory
Features
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1. High Refractoriness: They can withstand very high temperatures, making them suitable for use in furnaces and other high-temperature environments.
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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.
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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.
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4. Resistance to Corrosion and Abrasion: They are resistant to chemical corrosion and mechanical wear, prolonging their lifespan in harsh operating conditions.
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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 main 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.
In which applications are high alumina bricks used?
They are commonly applied in steel, cement, glass, and ceramics industries, specifically for masonry blast furnaces, hot blast stoves, electric furnace tops, and ladle permanent linings.
What is the refractoriness limit of LZ-75 and LZ-65 bricks?
Both the LZ-75 and LZ-65 models feature a high refractoriness of ≥ 1790 ℃.
How does the Al2O3 percentage vary across the models?
The Al2O3 percentage is ≥ 75% for LZ-75, ≥ 65% for LZ-65, ≥ 55% for LZ-55, and ≥ 48% for LZ-48.
What is the Cold Crushing Strength (CCS) value for LZ-75?
The Cold Crushing Strength (CCS) of the LZ-75 high alumina brick is ≥ 53.9 MPa.