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Magnesia is the main raw material for magnesia based refractory materials, with the main chemical component being MgO and the mineral being periclase.

1. Magnesite

The impurities contained in magnesite can promote sintering, but when the content of impurities is high, its fire resistance is greatly reduced.

2. Sintered magnesia

According to the different purity of magnesia, magnesia can be divided into high-grade (high purity) magnesia with a MgO content greater than 97%, middle-grade magnesia with a MgO content of 95% to 96%, and ordinary magnesia (brick making magnesia) with a MgO content not greater than 95%.

3. Electrically fused magnesia

The impurity content of fused magnesia is very low. Colorless and transparent large grain periclase can be obtained by smelting with a special process. Large grain magnesia has the following excellent properties and uses:

① Large crystalline magnesia has good crystallization, high purity, and few defects.

② Refractory materials made of electrically fused large crystalline magnesia are used in special parts of metal smelting furnaces with strong corrosion resistance, improving the service life of the smelting furnace