which areas can micro silica be used in
Micro silica is also called silica fume, which is a by-product of smelting silicon metal. When ferrosilicon and silicon metal are smelted, a large amount of high-temperature exhaust gas is generated in the ore furnace, which directly discharged into the atmosphere causes serous environmental pollution. However, the dust in exhaust gas is mainly SiO2 dust which is the fine spherical particles formed by the condensation of high temperature vaporized SiO2 account for about 90% by weight. The dust is micro silica. Then which areas can micro silica be used in?
In construction engineering, silica fume is mainly added to concrete to increase its strength and improve its durability. In addition, high performance concrete prepared with micro silica also has excellent structural properties, reduces engineering maintenance costs greatly and supports environmental sustainability.
High performance concrete: the micro silica is added to high performance concrete to improve the mechanical properties of the concrete to meet the design strength requirements. The compressive strength is generally higher than 70Mpa. High performance concrete is mainly used for the load-bearing beams of urban high-rise structures, real estate projects or office buildings.
The main advantage of silica fume application in the cement concrete industry is that micro silica can increase the reinforced concrete strength. Second, the incorporation of silica fume can reduce the permeability of concrete and increase the corrosion resistance of reinforced concrete; In addition, when silica fume is used in concrete, it can improve the wear resistance and impact resistance of concrete and is suitable for high-wear and corrosion damaged parts; Finally, micro silica has unique advantages in reducing the hydration temperature rise of flare-volume concrete, the rebound loss of shotcrete and the alkali aggregate reaction as well as increasing the cohesive force.
High-grade high performance low cement refractory castables and prefabricated parts have a service life three times that of ordinary castables and a refractoriness of about 100℃, which can greatly improve the compactness of cast refractories. When coexisting with Al2O3, it is easier to form a mullite phase, which has high temperature strength and thermal shock resistance. Therefore, micro silica has been widely used i coke ovens, large iron trenches and steel-clad materials, permeable bricks, non-ferrous metals, glass, ceramics and power generation industries.
3.Exterior Wall Insulation
Ultra-thin vacuum insulation board, the main raw material is silica fume. Excellent thermal insulation and energy saving, low thermal conductivity and the effect is equivalent of 6-10 times of other thermal insulation materials.