High Alumina Refractory Brick

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High alumina refractory bricks are made from bauxite or kaolinitic clays. The definition of high-alumina refractory bricks contains between *8 and *9 percent alumina. They are much harder than the same grade of 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 generally used in blast furnaces, blast-furnace stoves, liquid-steel ladles, etc.
 
 
 The high alumina bricks are classified into three grades as per the amount of Al2O3they contain. These are 
Grade I Al2O3 content in the range of *5~*1%
Grade II Al2O3 content in the range of *0~*5%
Grade III Al2O3 content in the range of *8~*0%
Top Grade Al2O3 content in the range of *2~*9%
 
 
Properties of High Alumina Bricks
High alumina bricks are advanced refractory materials with very high refractoriness up to ********0°C, much higher than fire clay and semi-silica bricks.
"High alumina bricks are very durable. They are also well-designed for use in high-temperature areas like blast furnaces.
High alumina bricks usually have higher refractoriness and lower impurities.
These bricks have a higher Al2O3 content than han other bricks in the same category. Therefore, they are also called neutral refractory materials resistance to both acidic and basic-slag erosion.
Break up the fifth sentence: "Along with Al2O3, these bricks also contain SiO2, which enhances their resistance to acidic slag erosion even more.
 
Characteristic as follows:
 Refractoriness; the refractoriness of high alumina bricks is higher than thats of clay and semi-silica brick refractoriness up to ***0~***0„ƒ, belonging to high-grade refractory.
 b, load softening temperature; high aluminum products because of high Al2O3, less impurities, 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.
 c, slag resistance; Al2O3 in alumina bricks are closer to neutral refractories, resistant to erosion of acid or alkaline slag, because it contains SiO2, so resistance to alkaline slag ratio of acid slag ability is weaker.
 
Application of High Alumina Refractory Bricks
The high alumina brick is used mainly in masonry in a blast furnace, hot blast furnace, electric furnace roof, blast furnace, reflecting furnace, and lining of rotary kilns. In addition, high alumina brick is used widely in open hearth furnace lattice brick, plugs used in casting systems, nozzle brick, etc. But 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.