Standard High Alumina Bricks
High alumina bricks are neutral refractory materials with a certain degree of corrosion resistance to both acidic and alkaline slags. They feature high cold crushing strength, excellent erosion resistance, strong anti-permeability, and high refractoriness under load. These materials are widely used in various applications, such as blast furnaces, hot blast stoves, shaft furnaces, and rotary kilns.
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Physical and Chemical Indicators
|
Item |
LZ-80 |
LZ-75 |
LZ-70 |
LZ-65 |
LZ-55 |
LZ-48 |
|
Al₂O₃ (%) |
≥ 80 |
≥ 75 |
≥ 70 |
≥ 65 |
≥ 55 |
≥ 48 |
|
Apparent Porosity (%) |
≤ 21 |
≤ 24 |
≤ 24 |
≤ 24 |
≤ 22 |
≤ 22 |
|
Cold Crushing Strength (MPa) |
≥ 70 |
≥ 60 |
≥ 55 |
≥ 50 |
≥ 45 |
≥ 40 |
|
Refractoriness Under Load (0.2MPa, ℃) |
≥ 1530 |
≥ 1520 |
≥ 1510 |
≥ 1500 |
≥ 1450 |
≥ 1420 |
|
Permanent Linear Change (%) |
-0.4~0.2 (1500℃×2h) |
-0.4~0.2 (1500℃×2h) |
-0.4~0.2 (1500℃×2h) |
-0.4~0.1 (1450℃×2h) |
-0.4~0.1 (1450℃×2h) |
-0.4~0.1 (1450℃×2h) |
Anti-Spalling High Alumina Bricks
Anti-spalling high alumina bricks possess excellent thermal shock resistance and anti-spalling properties, along with the ability to resist alkali, sulfur, and chlorine corrosion. They are characterized by high refractoriness under load, high-temperature strength, and resistance to alkali and cement clinker erosion. They are primarily used in cement kilns and lime kilns.
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Physicochemical Properties:
|
Item |
GKBL70 |
KBL75 |
|
Al₂O₃ (%) |
≥ 70 |
≥ 75 |
|
ZrO₂ (%) |
≥ 6.0 |
/ |
|
Fe₂O₃ (%) |
≤ 1.5 |
≤ 1.5 |
|
Bulk Density (g/cm³) |
≥ 2.55 |
≥ 2.6 |
|
Apparent Porosity (%) |
≤ 22 |
≤ 20 |
|
Cold Crushing Strength (MPa) |
≥ 60 |
≥ 70 |
|
Refractoriness Under Load (0.2MPa, ℃) |
≥ 1470 |
≥ 1520 |
|
Thermal Shock Resistance (Cycles, 1100℃ water cooling) |
≥ 25 |
≥ 20 |
