Huachen Refractory
Silica insulation brick instroduction
Silic insulation refractory brick refers to silica as the main raw material, made of SiO2 content of not less than 91% of insulating refractory brick. In addition to thermal insulation performance, silica insulation fire brick to a large extent to maintain the characteristics of silica brick, high begining temeprature of refractoriness under load, in the heating process, the volume slightly expanded, so that the integrity of the furnace enhanced. Manufacturing silica insulation fire brick uses the siliceous stone which passes fine pulverization to be raw material, join powder of brick which partial and waste silica insulation fire brick or waste silica, mineralization agent and burn up add thing to wait. According to a certain proportion, water is added to the mixer to mix mud materials. After mechanical or manual molding, the residual moisture of the adobe after drying can be less than 0.5% before being installed in the kiln. In order to prevent the sharp volume expansion caused by the polycrystalline transformation of SiO2 from causing cracks in the products, a relatively slow rise and temperature drop rate is required during firing.
Silica insulation brick characters
In addition to thermal insulation performance, silica insulation fire brick to a large extent to maintain the characteristics of silica brick, high begining temeprature of refractoriness under load, in the heating process, the volume slightly expanded, so that the integrity of the furnace enhanced. Builk density less than 1.2 g/cm3, Cold crushing shtength is move than 3.43 MPa, refractoriness not more than 1670 ℃,0.098 MPa load softening temperature is not less than 1560 ℃, SiO2 content of not less than 91%
Silica insulation brick applications
Silica insulation fire brick is suitable for laying temperature does not exceed 1550 ℃, not direct contact with high temperature melting materials and industrial furnace lining erosion gas effect directly or used for thermal insulation.
