Magnesium Aluminum Spinel (MgAl2O4)

Magnesium aluminum spinel（MgAl2O4） is a common basic refractory material composed mostly of magnesia and alumina as raw materials, as well as synthetic spinel refractory raw materials. This basic material is rarely found in nature, and all magnesium aluminate spinel utilized in industry is manufactured chemically. High-quality bauxite with an Al2O3 concentration of more than 76% and high-quality light-burned magnesium powder with a MgO content of more than 95% are used in the bauxite-based sintered magnesia-aluminum spinel. Above, sintered at high temperatures.

Magnesium aluminum spinel (MgAl2O4) is the only intermediate compound in the MgO-Al2O3 binary system. The theoretical composition of  the Insulation Materials is MgAl2O4 or MgOAl2O3. Its crystal structure belongs to the equiaxed crystal system, and the second-order cations are filled in eighth Four-coordination is formed in one of the tetrahedral voids, and the third-order cations are filled in one-half of the octahedral voids to form eight-coordination, and the oxygen ions are arranged in cubic close packing. Al-O and Mg-O are combined by strong high sub-bonds, and their electrostatic bond strengths are equal, and the structure is firm. Therefore, the crystal structure of magnesium-aluminum spinel is saturated, and it has good thermal shock stability, chemical corrosion resistance and In addition,magnesia-alumina refractory materials MgAl2O4 also has the characteristics of high melting point (2135°C), high chemical stability, and low thermal expansion coefficient.

Magnesium aluminum spinel belongs to equiaxed minerals, n=1.715, hardness=8, relative density 3.55, melting point 2135℃. High-purity magnesia-aluminum spinel is colorless, but it is red when it contains a small amount of Cr²+, green when it contains Cr+>15%, grass green when it contains a small amount of Fe3+, and sky blue when it contains Fe2+. Magnesium-aluminum spinel crystals formed under natural conditions have good chemical stability, so they are often found in bleaching sand deposits. Well-developed, pure-composition magnesia alumina spinel crystals do not hydrate or react with acids.

Spinel refractories with magnesium aluminum spinel as the main raw material widely used in cement rotary kilns, ladles, transparent ceramics, Nuclear fuel and solid fuel cells, etc.

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