Silica bricks are the main species of silica-based refractory materials in which the mass fraction of SiO 2 is not less than 93%. Silica brick is a typical acid refractory bricks, the acid slag has a good resistance to the alumina, FeO, iron oxide and other oxides also have good resistance, but the resistance of alkaline slag is poor, easy to be oxidized Calcium, K2O, Na2O and other oxides of the role of destruction. Silicone brick load softening temperature as high as l640-1680 ℃, long-term use at high temperatures more stable. But the thermal shock resistance of silicon brick, refractoriness is not high enough. The properties of silicon bricks include chemical mineral composition, true density, bulk density, refractoriness, load softening temperature, high temperature volumetric stability, thermal shock resistance and slag resistance, etc., with the nature of raw materials, crystal transition conditions and manufacturing process And many other factors are closely related.c