High Alumina Refractory Bricks
High-alumina refractory bricks are a type of aluminosilicate refractory material with alumina as the main component. With an alumina content exceeding 48%, they are classified as neutral refractory materials, made from bauxite or other raw materials with high alumina content through molding and calcination.
Classification:
Based on the alumina content, they are divided into three grades:
Grade 1: high-alumina bricks (Al₂O₃ content > 75%)
Grade 2: high-alumina bricks (Al₂O₃ content: 60%~75%)
Grade 3: high-alumina bricks (Al₂O₃ content: 48%~60%)
Common Brick Shapes & Custom Options:
Standard bricks, wedge bricks, checker bricks, curved bricks, anchor bricks, universal arch bricks, octagonal bricks, casting bricks, and custom shapes according to client`s drawings / samples.
Key Features:
1. Refractoriness
It can withstand high temperatures above 1770℃, generally ranging from 1750℃ to 1790℃. The refractoriness increases with the rise of alumina content.
2. Load Softening Temperature
It is generally 1420℃~1530℃. Owing to the high alumina content, low impurity content and minimal formation of fusible glass phase, its load softening temperature is higher than that of fire clay bricks.
3. Cold Compressive Strength
The cold compressive strength of Grade 1 high-alumina bricks (LZ-80) is ≥ 70 MPa, while that of Grade 3 high-alumina bricks (LZ-48) is ≥ 40 MPa.
4. Slag Resistance
High-alumina bricks are close to neutral refractory materials, which can resist the erosion of both acidic and alkaline slags, but their resistance to alkaline slags is weaker than that to acidic slags.
5. Apparent Porosity
The apparent porosity of Grade 1 high-alumina bricks is ≤ 21%, and that of Grade 3 high-alumina bricks is ≤ 22%.
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INDEX
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SK-35
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SK-36
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SK-37
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SK-38
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SK-39
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SK-40
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Refractoriness(℃) ≥
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1770
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1790
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1820
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1850
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1880
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1920
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Bulk Density(g/cm3) ≥
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2.25
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2.30
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2.35
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2.40
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2.45
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2.55
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Apparent Porosity(%) ≤
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23
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23
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22
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22
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21
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20
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Cold Crushing Strength(MPa) ≥
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40
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45
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50
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55
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60
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70
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Permanent Linear Change@1400°×2h(%)
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±0.3
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±0.3
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±0.3
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±0.3
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±0.2
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±0.2
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|
Refractoriness Under Load @ 0.2MPa(℃) ≥
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1420
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1450
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1480
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1520
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1550
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1600
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Al2O3(%) ≥
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48
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55
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62
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70
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75
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80
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Fe2O3(%) ≤
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2.0
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2.0
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2.0
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2.0
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2.0
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1.8
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Applications:
1. Used for high-temperature industrial kilns and furnaces inner linings
2. Widely applied in rotary kilns, tunnel kilns and shuttle kilns
3. Suitable for cement kiln preheater and calciner zones
4. Applied in steel industry heating furnaces, soaking pits and ladle linings
5. For boiler, incinerator and power plant high-temperature furnace linings
6. Used in ceramic and glass kiln thermal insulation & working linings
7. Ideal for non-ferrous metal smelting furnaces
8. Applied in chemical high-temperature reaction furnaces
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