Silica Brick
Description
Silica bricks are acidic refractory materials with good acid erosion resistance, high load softening temperature, generally above 1620°C, which is only 70~80°C lower than its refractory degree. The thermal conductivity of silica fire bricks increases with the increase of operating temperature, and there is no residual shrinkage. During the oven process, the volume of silicon fire bricks increases with the increase of temperature.
Physical And Chemical Indicators
Silica brick Parameters
1. Chemical composition: SiO2>94%, Al2O3<1.8%, Fe2O3<1.2%
2. Bulk density: 2.35-2.38g/cm³
3. Cold crushing strength: ≥45MPa
4. Refractoriness under load: ≥1650℃
5. Thermal shock resistance: ≥15 times
6. Linear change rate: ±0.2%
Products Points
When using silica bricks, you should pay attention to the following two points:
(1) When siliceous products are at 200~300℃ and 573℃, due to the crystalline transformation, the volume suddenly expands. Therefore, the temperature should not be raised too fast below 600℃ during the oven, and violent temperatures should be avoided when cooling below 600℃. Variety.
(2) It should be kept away from contact with alkaline slag as much as possible.
Do the light-colored spots on the surface of silica refractory bricks have any impact on product quality?
After the silica firebricks are fired, dark or light spots will appear on the surface. This is because after the crystal form is fully transformed, the residue left behind appears on the surface of the bricks, and the color of the silica refractory bricks is yellow or alternately yellow and reddish. , some are white and yellowish in color, but the spots on the surface do not affect any indicators or quality problems.
Products Productive Process
The Silica Brick raw materials are High-purity quartz, often sourced from quartzite or silica sand, serves as the primary component. The raw materials undergo precise blending, shaping, and firing at controlled temperatures. This meticulous process ensures the development of a brick with the desired density and refractory characteristics.
The production process involves precise blending of high-purity quartz, shaping the mixture into bricks, and subjecting it to controlled firing. The firing process enhances the brick's density and ensures the formation of desirable crystalline structures.
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