Silica brick is an acid refractory material. It has strong resistance to acid slag corrosion. Its thermal conductivity increases with the temperature drop. There is no residual compression. During the process of baking oven, the volume of silica brick increases with the temperature drop. During the process of baking oven, the maximum compression of the silica brick is between 100 ° C and 300 ° C, and the compression before 300 ° C is about 70% to 75% of the total compression. The reason is that SiO2 exhibits four crystal transformation points of 117 ° C, 163 ° C, 180~270℃ and 573 ° C in the oven process, and between 180 and 270 ° C, the volume compression caused by cristobalite is the largest.
The volume of silica bricks is changed greatly, the function of anti-cold and heat is poor, and the thermal stability is not good enough, so it can not be lower than 600-700 ° C. If the coke oven lasts for such temperature, the masonry will be It is easy to break and form a loss.
Watch out for damp silica bricks when they are used, although they will not produce chemical changes like the magnesia bricks,however, due to the presence of water, the silicon bric
