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Middle-grade magnesia magnesite stone is super and level, by light burned, fine grinding, ball pressure, high temperature shaft kiln sintering. Magnesia in low content of impurities, volume density, good slag resistance, used in the manufacture of middle-grade magnesia brick or magnesia not stereotypes refractories. 
Middle-grade magnesia is 97% of the content of MgO style light burned magnesia as raw material, after the ball, such as high temperature shaft kiln calcining process. Product good sintering degree, crystal density, is the high quality raw materials for the production of middle-grade magnesia refractory products.