Aluminous magnesium spinel refers to magnesium oxide and alumina as raw materials, by artificial synthesis of spinel refractory raw materials. The raw material found in nature is very little, industrial magnesia-alumina spinel is synthetic. Bauxite-based sintered magnesia spinel is made of high-quality bauxite with Al2O3 content of over 76% and high quality lightly sintered magnesia powder with MgO content of over 95%, through a multi-stage homogenization process, sintered in ultra-high temperature tunnel kiln at over 1800°C.

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