Methods to decrease the porosity rate of refractory brick

Production of refractory  brick  is always encountered too many holes, how can we reduce the occurrence of this situation? Today we shall all requirements to introduce how to reduce the rate of porosity of refractory brick.

Selection of high density, low water absorption rate of the raw material, through the reasonable distribution is the key to prepare low porosity refractory brick. Refractory brick is used 50% of the soft clay and 50% hard clay clinker ingredients, according to a certain size requirements, forming, drying, firing at high temperature of 1300~1400 DEG C under the. Refractory mineral is mainly composed of kaolinite (Al2O3 – 2SiO2 – 2H2O) and 6%~7% impurities (potassium, sodium, calcium, titanium, iron oxide). The sintering process is mainly kaolinite continuous dehydration decomposition of mullite (3Al2O3 – 2SiO2) crystallization process. Refractory brick in SiO2 and Al2O3 on the sintering of eutectic of low melting point of silicate and impurities in the formation process of mullite crystals surrounded by around. In the process of baking temperature control at 1350 to 1380 DEG C, appropriate to increase the low porosity clay brick firing temperature (1420 C), refractory brick contraction increased slightly, so that the refractory brick density increases slightly, and low porosity can be reduced.