Silica Brick
Silica brick is an acid-resistant refractory material, mainly composed of tridymite, cristobalite and a small amount of residual quartz and glass phase. The silicon dioxide content is above 94%, and it has good resistance to acid slag erosion. The softening temperature under load is as high as 1640-1670℃, the volume is relatively stable at high temperature, and it can be used for a long time.
Silica Brick Specifications
| Silica Brick | GZ-95 | GZ-94 | GZ-93 |
|---|---|---|---|
| SiO2 | ≥95 | ≥94 | ≥93 |
| Refractoriness,℃ | 1710 | 1710 | 1690 |
| Apparent Porosity,％ | ≤22 | ≤23 | ≤25 |
| Bulk Density, g/cm3 | ≥1.8 | ≥1.8 | ≥1.8 |
| True Density, g/cm3 | ≤2.34 | ≤2.34 | ≤2.34 |
| Cold Crushing Strength, Mpa | ≥35 | ≥35 | ≥35 |
| 0.2Mpa Refractoriness Under Load T0.6, ℃ | ≥1650 | ≥1640 | ≥1620 |
| 20－1000 ℃ Thermal Expansion, % | 1.25 | 1.25 | 1.25 |
| Thermal Conductivity at 1000 ℃ , W/m.K | 1.44 | 1.44 | 1.44 |
Silica brick characteristics
Product characteristics of silica bricks for coke oven:
Silica brick has become the main refractory material for coke ovens due to its good thermal conductivity, high load softening temperature, good mechanical strength at high temperature, stable volume change at high temperature, high refractoriness, small residual expansion, and strong resistance to acid slag erosion.
Product characteristics of silica bricks for glass kiln:
- High temperature volume stability.
- The glass liquid is slightly polluted.
- Chemical corrosion resistance.
- Small bulk density, which can reduce the weight of the furnace body.
Product characteristics of silica bricks for hot blast stove:
- Under long-term high-temperature and high-load conditions, the volume is stable and the high-temperature creep rate is low, and one or two blast furnaces can be used continuously.
- It has good thermal shock resistance above 600 degrees, adapts to the temperature change of the hot blast stove, and keeps the masonry intact.
- Chemical resistance is better than clay bricks and general high alumina bricks.
- The thermal conductivity of silica bricks for hot blast stoves is greater than that of clay bricks and high alumina bricks, which is conducive to heat storage and heat release in a short time.
Application of silica brick
Silica bricks are mainly used in the partition wall of carbonization and combustion chamber of coke oven, heat storage chamber and slag chamber of steel blast furnace, even heat furnace, glass melting kiln and ceramic firing kiln, also used in the high temperature bearing part of hot blast furnace and acid blast furnace roof.
