Grade and characteristics of high alumina brick

high alumina bricks

Aluminum oxide (Al2O3) content higher than 48% of alumina silicate refractory products. An alumina content of more than 48% of a neutral refractory material. Of alumina or other high alumina content of raw materials by forming and calcination. High thermal stability, Refractoriness above 1770 ℃, Slag resistance good, used for  the lining of masonry furnace, glass furnaces, cement rotary kiln, etc.

Alumina bricks is a refractory materials, the main ingredient of such a refractory brick is AL2O3. Such as Al2O3 content higher than 90%, called corundum brick. Due to the different resources, national standards are not entirely consistent. European countries such as high alumina refractories prescribed limit of 42% Al2O3 content. In China, according to the high alumina bricks Al2O3 content is usually divided into three classes: Ⅰ Grade ──Al2O3 content> 75%;  Ⅱ Grade──Al2O3 content 60 ~ 75%; Ⅲ Grade ──Al2O3 content 48 to 60%.

Soft high load, low creep high alumina brick is a premium alumina, fused alumina, fused mullite refractory materials as the main raw material. The product has a small temperature creep, corrosion resistance, good thermal shock resistance, etc., suitable for large and medium-sized stove, it is required for our new high-quality stove, imports of high-grade refractory localization open next Road to Success.

Characteristic as follows:

a, refractoriness; high alumina bricks refractoriness are higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790 ℃, 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 more close to neutral refractories, resistant to erosion of acid and alkaline slag slag, because it contains SiO2, so resistance to alkaline slag ratio of acid slag ability weaker.

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Grade and characteristics of high alumina brick
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