With the correct operation of the method can reduce the porosity of the refractory bricks

Use the correct method of operation can reduce the rate of porosity of refractory brick. We always meet the refractory brick appear excessive porosity of refractory brick, how can we reduce the occurrence of such a situation?Today we shall all the requirements to introduce how to decrease the porosity of refractory brick rate.

Selection of high density, low water absorption rate of raw materials, through reasonable distribution is the key to prepare low porosity refractory brick. Refractory brick is used in 50% of soft clay and 50% hard clay clinker, ingredients according to a certain size requirements, forming, drying, firing at high temperature 1300~1400 ℃. Refractory brick is mainly kaolinite mineral composition (Al2O3 2SiO2 2H2O) and 6%~7% impurities (potassium, sodium, calcium, titanium, iron oxide). Sintering process is mainly kaolinite continuous dehydration decomposes mullite (3Al2O3 • 2SiO2) crystallization process. Refractory brick in SiO2 and Al2O3 in firing eutectic of low melting of silicate and impurity formation process, surrounded by mullite crystals around. In the burning process of the highest temperature control in 1350 ℃ to 1380 ℃, proper increase of low porosity clay brick firing temperature (1420 ℃), firebrick contraction increased slightly, so that the refractory brick density increases slightly, low porosity can be reduced.

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