What are the characteristics of lightweight silica bricks?

August 10, 2018
Lightweight silicon bricks, also known as silicon heat-insulating bricks, have a silica content of more than 91% and a lightweight refractory material with a bulk density of 1.2 kg/cm3 or less. The refractoriness and load softening temperature are similar to those of ordinary silica bricks with the same composition. However, due to the large number of pores, the compressive strength, slag resistance, corrosion resistance, etc. are not as good as those of ordinary silica bricks, but the thermal shock resistance is improved.
The finely divided silica is used as a raw material, and the critical particle size thereof is usually not more than 1 mm, and the particles having less than 0.5 mm are not less than 90%. A flammable substance is added to the furnish or a porous structure is formed by a gas generating method, and is obtained by firing. It can also be made into non-fired products. It is mainly used in various parts of the kiln that require heat insulation or light weight reduction without direct contact with the melt, no corrosive gas, and no temperature change. Used at high temperatures, it cannot be in contact with alkaline refractories. The material is different, and its maximum operating temperature is 1200~1550 °C.