Represented by magnesium products. It contains over 80% to 85% magnesium oxide, with periclase as the main crystalline phase. The main raw materials for producing magnesium bricks include magnesite and seawater magnesia sand, which are made by high-temperature calcination of magnesium hydroxide extracted from seawater. Has good resistance to alkaline slag and iron slag. The melting point of pure magnesium oxide is as high as 2800 ℃, therefore, the fire resistance of magnesium bricks is higher than that of clay bricks and silica bricks. Since the mid-1950s, the production of alkaline refractory materials has gradually increased due to the use of oxygen blowing converter steelmaking and alkaline open hearth furnace tops, while the production of clay bricks and silica bricks has decreased. Alkaline refractory materials are mainly used in open furnaces, oxygen blowing converters, electric furnaces, non-ferrous metal smelting, and some high-temperature thermal equipment.
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