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Magnesia brick can be divided into sintered magnesia brick and chemically bonded magnesia brick according to their different production processes.Sintered magnesia brick is made after death, the granular size ratio appropriate magnesia, adding brine aqueous solution (MgCl2) and sulfite pulp waste liquor as a binder, compression molding, in 1550 ~ 1650 ℃ high temperature firing.While the chemically bonded magnesia brick does not go through the firing process. After the sintered magnesia is prepared in proportion to the particle size, an appropriate amount of mineralization agent and binder is added and pressed into shape. The finished product is dried.The strength of chemically bonded magnesite brick is low and its performance is not as good as that of sintered magnesite brick, but its price is cheap and less than half of that of sintered magnesite brick.It is used in the performance requirements are not too high parts, such as heating furnace and soaking pit furnace bottom.
Refractoriness of magnesite brick can reach above 2000 ℃, its melting point of refractoriness under load with the cementation facies and in the heat generated by the liquid phase in the number of different and have bigger difference.General magnesite brick rul start temperature between 1520 ~ 1600 ℃, and high purity magnesia brick up to 1800 ℃.The initial softening temperature of magnesite brick under load is not different from the collapse temperature.20 ~ 1000 ℃ under the magnesite brick linear expansion rate is generally 1.2% ~ 1.4%, and the approximate linear.When the liquid phase appears in the brick under high temperature, sudden shrinkage will occur.The thermal conductivity of magnesite brick is higher than that of carbon brick and silicon carbide brick.The thermal shock resistance of magnesia brick is poor, and the thermal shock resistance can be improved by increasing the purity of magnesia brick.The ability that magnesia brick fights acidity dregs is very poor, cannot contact with silica brick directly when using, want to separate its with neuter brick commonly.The conductivity of the magnesite brick at room temperature is very low, but under high temperature (1500 ℃) can not be ignored, if used in electric furnace hearth, should pay attention.