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Brief description of silicon brick
The mineral phase composition of silicon brick is mainly squamous quartz and quartzite, and a little quartz and glassy. The volume of squamous quartz, quartzite and residual quartz varies greatly due to the change of crystal type at low temperature, so the thermal stability of silicon brick at low temperature is very poor. In the process of use, under 800℃ to slowly heating and cooling, so as not to crack. Therefore, it should not be used in the kiln with temperature changes below 800℃.
Features of silicon brick
Silica brick has the characteristics of high purity, high strength, wear resistance and high density, as well as high thermal shock resistance, volume stability and low creep performance. It is widely used in glass smelting furnace, coke oven, hot blast furnace and other high-temperature thermal equipment. In particular, high-temperature thermal equipment can be repaired at will without ceasing fire.
Application of silicon brick
Silicon bricks are mainly used for coke oven carbonization combustion chamber partition, steel Martin furnace storage tank and sedimentation chamber, intermediate heat furnace, glass furnace refractory furnace and ceramic kiln. It can also be used for high temperature bearing parts of hot blast furnace and furnace top of acid open hearth furnace.
Parameters of Silica bricks
| Silica bricks for coke oven | Furnace bottom, furnace wall | Other |
| SiO2 % ≥ | 94.5 | 94 |
| Al2O3 % ≤ | 1.2 | 1.5 |
| Fe2O3 % ≤ | 1.2 | 1.5 |
| CaO % ≤ | 3.0 | 3.0 |
| Na2O+K2O % ≤ | 0.35 | 0.35 |
| Apparent porosity % ≤ | 22 | 24 |
| Normal temperature compressive strength MPa ≥ | 35 | 28 |
| 0.2MPa Load softening temperature℃ ≥ | 1650 | |
| True Density g/cm3 ≥ | 2.33 | 2.34 |
| Reburn line change % 1450℃x2h | 0-0.2 | |
| Coefficient of thermal expansion 1000℃ % ≤ | 1.28 | 1.3 |