High Alumina Refractory Brick

In China, according to the content of Al2O3 in high alumina refractory bricks , it is usually pided into three grades: Grade IAl2O3 content75%; Grade IIAl2O3 content is 60-75%; Grade IIIAl2O3 content is 48-60%. The production process of high-alumina bricks and multi-clinker clay bricks is similar, the difference is that the proportion of clinker in the ingredients is higher, which can be as high as 90-95%. Higher, such as I, II and other high alumina bricks are generally 1500 ~ 1600 ℃ when fired in tunnel kilns. Feature 1. Refractoriness The refractoriness of high alumina refraactory bricks i

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Refractory Fire Brick

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High Alumina Refractory Brick Details

In China, according to the content of Al2O3 in high alumina refractory bricks, it is usually pided into three grades: Grade I——Al2O3 content>75%; Grade II——Al2O3 content is 60-75%; Grade III——Al2O3 content is 48-60%.

The production process of high-alumina bricks and multi-clinker clay bricks is similar, the difference is that the proportion of clinker in the ingredients is higher, which can be as high as 90-95%. Higher, such as I, II and other high alumina bricks are generally 1500 ~ 1600 ℃ when fired in tunnel kilns.

Feature

1. Refractoriness

The refractoriness of high alumina refraactory bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃, which belongs to advanced refractory materials.

2. Load softening temperature

Because the Al2O3 in high alumina products is high, the amount of impurities is low, and the fusible glass body is less, so the softening temperature under load is high, but because the mullite crystal does not form a network structure, the softening temperature under load is still not as high as that of silica brick.

3. Slag resistance

High alumina refractory bricks are close to neutral refractory materials and can resist the erosion of acidic slag and alkaline slag. Because they contain SiO2, their ability to resist alkaline slag is weaker than that of acid-resistant slag.

Application

Mainly used for masonry blast furnace, hot blast stove, electric furnace roof, blast furnace, reverberatory furnace, rotary kiln lining. In addition, high alumina bricks are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc.

Physical And Chemical Indicators

Brand Properties		SK-40	SK-38	SK-37	SK-36	SK-35
Refractoriness (SK)		40	38	37	36	35
Apparent Porosity (%)		22	23	23	23	23
Bulk Density (g/cm3)		2.65	2.40	2.35	2.30	2.25
Cold Crushing Strength(MPa)		70	52	50	45	40
Thermal Linear Expansion(%) @1000deg		0.6	0.6	0.6	0.6	0.6
Permanent Linear Change(%) @1400degx2hrs		±0.2	±0.3	±0.3	±0.3	±0.3
Refractoriness under Load (ºC) @0.2MPa		1,530	1,500	1,450	1,420	1,380
Chemical Composition(%)	Al2O3	80	72	60	50	45
Chemical Composition(%)	Fe2O3	1.8	2.0	2.0	2.0	2.0

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