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粘(zhan)土(tu)(tu)磚(zhuan)是(shi)(shi)指Al2O3含量為30%~40%硅酸鋁材料的(de)粘(zhan)土(tu)(tu)質制品。粘(zhan)土(tu)(tu)磚(zhuan)是(shi)(shi)用50%的(de)軟質粘(zhan)土(tu)(tu)和50%硬質粘(zhan)土(tu)(tu)熟(shu)料，按一定(ding)的(de)粒度要(yao)求進行配料，經成(cheng)(cheng)(cheng)(cheng)型、干燥后1300~1400℃的(de)高溫下(xia)燒成(cheng)(cheng)(cheng)(cheng)。粘(zhan)土(tu)(tu)磚(zhuan)的(de)礦物(wu)組成(cheng)(cheng)(cheng)(cheng)主要(yao)是(shi)(shi)高嶺石(shi)（Al2O3·2SiO2·2H2O）和6%~7%的(de)雜質（鉀、鈉、鈣、鈦、鐵的(de)氧化物(wu)）。粘(zhan)土(tu)(tu)磚(zhuan)的(de)燒成(cheng)(cheng)(cheng)(cheng)過(guo)程(cheng)，主要(yao)是(shi)(shi)高嶺石(shi)不(bu)斷失水分解生(sheng)成(cheng)(cheng)(cheng)(cheng)莫來(lai)石(shi)（3Al2O3·2SiO2）結晶(jing)的(de)過(guo)程(cheng)。粘(zhan)土(tu)(tu)磚(zhuan)中的(de)SiO2和Al2O3在(zai)燒成(cheng)(cheng)(cheng)(cheng)過(guo)程(cheng)中與(yu)雜質形成(cheng)(cheng)(cheng)(cheng)共晶(jing)低(di)熔點(dian)的(de)硅酸鹽，包圍(wei)在(zai)莫來(lai)石(shi)結晶(jing)周圍(wei)。