Acidic refractory mainly composed of tridymite, cristobalite and a small amount of residual quartz and glass phases.
The silica content is more than 94%. The true density is 2.35g/cm3. It has resistance to acid slag erosion. Higher high temperature strength. The starting temperature of softening under load is 1620-1670°C. Long-term use at high temperatures will not deform. Low thermal shock stability (1 to 4 times of heat exchange in water). Natural silica is used as raw material, and an appropriate amount of mineralizer is added to promote the transformation of quartz in the green body into tridymite. It is slowly fired at 1350-1430°C in a reducing atmosphere. When heated to 1450 ℃, the total volume expansion is about 1.5~2.2%. This residual expansion will make the slits close and ensure the masonry has good air tightness and structural strength.
