What are the characteristics of silica bricks for glass kilns?
Silica bricks: Acidic refractory materials mainly composed of tridymite, cristobalite, and a small amount of residual quartz and glass phase. Its silica content is more than 94%, and it has the ability to resist acidic slag erosion, high high temperature strength, high load softening temperature, and long-term use without deformation under high temperature wells, but the thermal shock stability is low (heat exchange in water is 1 to 4 times).
Silica bricks are widely used, so what are the characteristics of silica bricks used in glass kilns? Let's briefly introduce them below.
Its main characteristics:
① High temperature volume is stable, and the furnace body will not change due to temperature fluctuations. Silica bricks have high load softening temperature, small creep rate, and the glass kiln keeps the furnace body unchanged at 1600℃, and the structure is stable.
② No pollution to glass liquid. The main component of silica bricks is SiO2. If there are pieces falling off or surface droplets during use, it will not affect the quality of glass liquid.
③ Chemical erosion resistance. The silica bricks of the upper structure are corroded by the gas containing R2O in the glass batch, and a smooth metamorphic layer is formed on the surface, which reduces the erosion rate and plays a protective role.
④ Low volume density. It can reduce the weight of the furnace body
The volume of blast furnaces is constantly expanding, and coke ovens are developing towards large-scale. The height of the carbonization chamber abroad has reached more than 7m, and 6m large-volume coke ovens are also very common in China, which puts forward new requirements for the quality of silica bricks for coke ovens. Our company has developed silica bricks with high hot strength, low true density, low thermal expansion rate, and high phosphorus quartz content, which meet the requirements of good stability and long service life of the coke oven body.
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