The Features And Applications Of Silica Bricks
Silica bricks is a refractory product regarding silicon dioxide as a main component and its content is above 93%. It is made of quartzite as a raw material, and a small amount of mineralizer is added to be fired at a high temperature. It belongs to acidic refractory,which has strong resistance to acid slag erosion, but it is strongly eroded by alkaline slag. It is easily destroyed by oxides containing Al2O3, K2O and Na2O,but it has good resistance to oxides such as CaO, FeO and Fe2O3. The mineral composition of silica brick is a coexisting multiphase structure such as tridymite, cristobalite, a small amount of residual quartz, and a glass formed at a high temperature. The higher deformation temperature of the load is the excellent characteristic of silica brick. Its melting point is close to the melting point of the quartz and cristobalite (1670℃, 1713℃) and fluctuating between 1640℃ and 1680℃. After re-calcining, silica bricks will undergo irreversible volume expansion due to the continued conversion of the quartz remaining in the bricks. In the interval from 300℃ to near the melting point, the volume of silica brick is stable and it will have a total volume expansion of about 1.5% to 2.2% when heated to 1450℃. However, this expansion will make the joints tight and ensure that the masonry has good air tightness and structural strength. Meanwhile, the biggest disadvantage of silica brick is its low thermal shock stability, followed by low refractoriness (generally 1690℃~1730℃), which limits its application range. Silica bricks are mainly used in coke ovens, glass melting furnaces, acid steelmaking furnaces and other thermal equipment.
Silica Bricks For Coke Ovens
The modern coke oven is a large-scale thermal equipment built of tens of thousands of tons, nearly thousands brick-type refractory materials, which the amount of silica bricks account for 60%~70%. The silica brick for coke oven is mainly composed of tridymite, which is mainly used for building regenerator walls, chutes, combustion chambers, carbonization chambers and furnace roofs of coke ovens. Silica bricks for coke ovens mainly have the characteristics of high load softening temperature, high thermal conductivity, good thermal shock resistance, and volume stability at high temperatures.
The Importance of Refractory Brick
Wood ovens are ideal for retaining heat to cook an amazing meal, but how do the ovens stand such high temperatures and why is it important? These bricks are made from a special type of ceramic which can withstand high temperatures without damage. A typical brick could start to break apart at 1200 degrees Fahrenheit (~ 649 degrees Celsius), but a refractory brick will handle heat up to 1800 degrees Fahrenheit (~982 degrees Celsius). This removes any of the stress that may come from heating up the wood oven, and you’ll be able to safely turn the temperature up knowing that the bricks can handle the heat. Refractory bricks are also energy efficient. This is because refractory bricks have low thermal conductivity, meaning that they start absorbing the heat quickly, so there’s no waste when preparing your meal. The bricks coupled with convection design, quality stainless steel, and outstanding ventilation allow the Alfa to retain heat for your perfect cook. Not only are refractory bricks tough against the heat, but they can also handle the wear-and-tear of cooking. You don’t have to worry about delicately touching your tools to the surface of an oven with refractory bricks. They are sturdy and resistance to abrasion – not only durable but long lasting. Refractory bricks often line the walls of industrial furnaces and incinerators, so you know they can take the heat and you can focus on cooking the perfect pizza or meal.
