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High alumina bricks are made from bauxite or kaolinitic clays. The definition of high alumina bricks contains between 50 and 87.5 percent alumina. They are much harder than fireclay refractories at high temperatures and in basic environments.
High alumina bricks are made from bauxite or kaolinitic clays. The definition of high alumina bricks contains between 50 and 87.5 percent alumina. They are much harder and tougher than fireclay refractories at high temperatures and in basic environments.
In addition, high-alumina refractory bricks exhibit better volume stability and abrasion resistance. High-alumina bricks are used in blast furnaces, blast-furnace stoves, liquid-steel ladles, etc.
The high alumina bricks are divided into three grades as per the amount of Al2O3 they contain.
Grade I which includes Al2O3 in the range of 75~81%
Grade II which includes Al2O3 in the range of 60~75%
Grade III which includes Al2O3 in the range of 48~60%
Top Grade which includes Al2O3 in the range of 82~89%
1. High alumina bricks are advanced refractory materials with very high refractoriness up to 1750-1790°C, much higher than fire clay and semi-silica bricks.
2. High alumina bricks are very durable. They are also well-designed for use in high-temperature areas like blast furnaces.
3. High alumina bricks usually have higher refractoriness and lower impurities.
4. These bricks have a higher Al2O3 content than other bricks in the same category. Therefore, they are also called neutral refractory materials resistant to both acidic and basic slag erosion.
5. Break up the fifth sentence: "Along with Al2O3, these bricks also contain SiO2, which enhances their resistance to acidic slag erosion even more.
The high alumina bricks are mainly used in masonry in blast furnaces, hot blast furnaces, electric furnace roofs, blast furnaces, reflecting furnaces, and lining of rotary kilns. In addition, high alumina brick is widely used in open hearth furnace lattice brick, plugs used in casting systems, nozzle brick, etc. However the price of high alumina brick is higher than the clay brick, so we do not need high alumina brick when the clay brick can satisfy the demand.
High alumina brick refractoriness is higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790℃, belonging to high-grade refractory.
high aluminum products because of high Al2O3, fewer impurities, and less fusible vitreous formed, so load softening temperature is higher than the clay brick, but not formed mullite crystalline, so load softening temperature silica brick is still not high.
Al2O3 in alumina bricks is closer to neutral refractories, and resistant to erosion of acid and alkaline slag, because it contains SiO2, so the resistance to alkaline slag ratio of acid slag ability is weaker.
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