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1.Product introduction of light weight silica insulation brick
Silica insulating refractory bricks are insulating silica refractory products with SiO2 content above 90% and bulk density less than 1.2g/cm³. The mineral composition of silica insulating refractory brick is: 78%~86% of phosphor quartz, 13%~15% of square quartz and 4%~7% of quartz.
Silicon thermal insulation refractory bricks are generally made of crystalline quartzite or silica sand as raw materials, with flammable substances added to the ingredients, such as coke, anthracite, sawdust, carbonized rice husk or gas foaming method to form a porous structure. The refractoriness and load softening temperature are not much different from those of ordinary silica bricks with the same composition.
2.Advantages of light weight silica insulation brick
Lightweight silica bricks have excellent refractory properties, load softening temperature close to dense silica bricks up to 1620 ℃, only a very small residual expansion, and its thermal stability is better than dense silica bricks. Therefore, lightweight silica bricks can be used for a long time under high temperature conditions (1500-1550℃) without contacting with slag.
3.Parameters of light weight silica insulation brick
| Item | QG-1.0 | QG-1.1 | QG-1.2 |
| SiO2 % | 91 | 91 | 91 |
| Refractoriness°C | 1680 | 1680 | 1670 |
| 0.2Mpa Refractoriness Under Load °C | 1480 | 1560 | 1560 |
| Cold Crushing Strength Mpa | 3.5 | 3.5 | 3.5 |
| True Density g/cm3 | 2.39 | 2.39 | 2.39 |
| Bulk Density g/cm3 | 1 | 1.1 | 1.2 |
| Permanent Linear Change On Reheating(%) | 0~+0.5 1450°CX2h | 0~+0.5 1550°CX2h | 0~+0.5 1550°CX2h |
| Thermal Conductivity (W/MK) 350°C | 0.55 | 0.6 | 0.65 |
4.Application of light weight silica insulation brick
Lightweight silica bricks are suitable for: coke ovens, hot blast furnaces, glass melting kilns, carbon kilns, etc.