Siliceous Refractory refers to the Refractory containing more than 293% SIO2, which is the main type of acid refractory products. The main products are fired silica bricks and some loose materials. The main components are A12O3 and SIO2, and a small amount of impurities which act as fluxes.
The siliceous Refractory is mainly composed of scale quartz, cristobalite, residual quartz and glassy phase. Silica was used as raw material and a small amount of lime and iron scale was added as mineralizer to promote the transformation of quartz into scale quartz in green body. The quartz in the Green Body is first transformed from low-temperature type to high-temperature type, then to calcite quartz and scale quartz. When cooled, cristobalite and cristobalite changed from high temperature to low temperature. The Crystal Transformation in the production of Silica brick also reduces the true specific gravity from about 2.65 to 2.23 & MDASH; 2.42 according to the degree of quartz transformation, accompanied by volume expansion: Silica brick is an acid Refractory, and its acid resistant slag is strong, its high temperature strength is good, load softening temperature is close to its fire resistance, generally 1620 & MDASH; 1660 °C. It has the advantages of long-term use without deformation at high temperature, the Amorphous transformation of Silica brick is generally over 600 °c, the expansion coefficient is smaller and the thermal shock resistance is higher, while the reverse is true below 600 °C. The utility model is mainly used for bricklaying coke ovens, and is also used for the vault and other load-bearing parts of various glass, ceramic, and Refractory furnaces, should not be used in thermal equipment below 600 °C and large temperature fluctuations.
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