The performance of magnesia has a significant impact on refractory materials!


Magnesite is calcined at high temperature from Magnesite, bischofite or Magnesium hydroxide extracted from seawater. It is the general name of products from Magnesite and other magnesia materials that have been treated at high temperature to reach the sintering process. Magnesia produced by one-step or two-step calcination process with high-temperature equipment such as shaft kiln and Rotary kiln, using natural Magnesite as material, is called sintered magnesia; Light burned magnesia powder, which is made of Magnesite and other materials and melted in an electric arc furnace and cooled in a molten state, is called seawater magnesia, which is made by extracting magnesium oxide from seawater.

Magnesia is one of the refractory materials used in the manufacturing of various magnesium bricks, magnesium aluminum bricks, ramming materials, furnace repair materials, etc. It contains a lot of impurities and is used for laying steel furnace bottoms, etc. High purity magnesite is produced by flotation purification of natural magnesite ore, light burning, fine grinding, ball temperature oil shaft kiln calcination. It is an indefinite refractory material for brick making.

The properties of magnesia are divided into chemical properties and physical properties. The chemical properties of magnesia mainly refer to the fact that magnesia is mainly composed of periclase MgO, which is one of the common minerals in cement maturation. Periclase can coexist with the four main minerals C3S, C2S, C3A, and C4AF in cement maturation. Therefore, periclase has good corrosion resistance for cement clinker.

The physical properties of magnesia refractories in cement Rotary kiln often show the following phenomena:

The high melting point of periclase makes many magnesia refractory materials have excellent high-temperature resistance;

Magnesite has good thermal conductivity. When high MgO refractory materials are used and the kiln shell cannot be hung, the surface temperature of the kiln body increases. At this time, not only does heat dissipation lose a lot, but also the cylinder body is simply burned out

The high coefficient of thermal expansion of periclase results in a lack of thermal shock resistance of magnesium refractory materials, and magnesium refractory materials often fall off during use.

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