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

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Low-Porosity Fireclay Bricks are characterized by a dense structure, low apparent porosity, and high cold crushing strength.

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Mullite bricks possess excellent high-temperature performance, high strength, high refractoriness under load, superior thermal shock resistance, and good chemical stability. They exhibit good corrosion resistance against acidic and low-alkaline slags.

Corundum Bricks

Corundum bricks feature high refractoriness under load and excellent chemical stability. They have strong resistance to acidic or alkaline slags, liquid metals, and molten glass, along with a dense structure.

Corundum Mullite Bricks

Corundum mullite bricks are characterized by high-temperature resistance, erosion resistance, chemical corrosion resistance, high cold crushing strength, high refractoriness under load, and good thermal shock stability.