Magnesia Alumina Bricks

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Magnesium aluminum brick (magnesia - product brick) is made from magnesia and a small amount of industrial alumina or bauxite as raw material to burn becomes a kind of basic refractory.Thermal stability is better than magnesite brick, refractoriness in more than 1580 ℃.The ability of alkaline slag erosion.Mainly used for steel-making furnace and furnace top, high temperature tunnel kiln, large cement rotary kiln and the melting furnace of non-ferrous metal.

1 introduction
Israel magnesium stone as the main mineral components of refractory products.According to the raw material of different, can be divided into:
Magnesium aluminum brick
Made of brick magnesia magnesite brick, add a small amount of special grade bauxite or industrial aluminium oxide magnesium aluminum bricks, graphite powder was added into the magnesia carbon brick, with poor quality of high silica silica magnesia made of magnesium.Compared with other refractory brick, magnesite bricks of high refractoriness, can reach more than 2000 ℃, has high refractoriness under load, high mechanical strength, and good resistance to alkaline slag containing iron oxide and calcium oxide chemical erosion performance.But generally poor thermal stability.
Magnesium oxide content in the products is approximately 85%.Alumina content is 5% ~ 5%, the Israeli magnesium stone as the main crystal phase, magnesium aluminate spinel, for crystal phase (combination as the main phase), alkaline refractory materials.Porosity is commonly 15 ~ 18%.Thermal expansion coefficient of 10.6 x 10-6 / ℃.Thermal shock resistance than phase
Magnesium aluminum brick
Should the magnesite brick is good.Due to distribution in the matrix which has higher melting point magnesium aluminate spinel and its high temperature and high strength, load softening starting temperature above 1580 ℃.The slag resistance is better also.With high quality sintered magnesite as granular materials commonly, join in a certain proportion coordination with alumina raw or lightly calcined alumina magnesia clinker or industrial alumina powder, by mixing, molding and firing system.

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