粘(zhan)(zhan)(zhan)土磚(zhuan)(zhuan)(zhuan)是(shi)(shi)(shi)指Al2O3含量(liang)為(wei)30%~40%硅(gui)(gui)酸鋁(lv)材料(liao)的(de)(de)粘(zhan)(zhan)(zhan)土質(zhi)(zhi)制品。粘(zhan)(zhan)(zhan)土磚(zhuan)(zhuan)(zhuan)是(shi)(shi)(shi)用(yong)50%的(de)(de)軟質(zhi)(zhi)粘(zhan)(zhan)(zhan)土和(he)(he)(he)50%硬質(zhi)(zhi)粘(zhan)(zhan)(zhan)土熟(shu)料(liao),按一定(ding)的(de)(de)粒度要(yao)求進行配料(liao),經成(cheng)(cheng)(cheng)型、干燥(zao)后1300~1400℃的(de)(de)高溫下(xia)燒成(cheng)(cheng)(cheng)。粘(zhan)(zhan)(zhan)土磚(zhuan)(zhuan)(zhuan)的(de)(de)礦物組成(cheng)(cheng)(cheng)主要(yao)是(shi)(shi)(shi)高嶺(ling)石(Al2O3·2SiO2·2H2O)和(he)(he)(he)6%~7%的(de)(de)雜質(zhi)(zhi)(鉀、鈉、鈣、鈦、鐵的(de)(de)氧化物)。粘(zhan)(zhan)(zhan)土磚(zhuan)(zhuan)(zhuan)的(de)(de)燒成(cheng)(cheng)(cheng)過(guo)(guo)程,主要(yao)是(shi)(shi)(shi)高嶺(ling)石不斷失水(shui)分解生成(cheng)(cheng)(cheng)莫(mo)來石(3Al2O3·2SiO2)結晶的(de)(de)過(guo)(guo)程。粘(zhan)(zhan)(zhan)土磚(zhuan)(zhuan)(zhuan)中(zhong)的(de)(de)SiO2和(he)(he)(he)Al2O3在燒成(cheng)(cheng)(cheng)過(guo)(guo)程中(zhong)與雜質(zhi)(zhi)形成(cheng)(cheng)(cheng)共晶低熔點的(de)(de)硅(gui)(gui)酸鹽,包圍在莫(mo)來石結晶周圍。它(ta)是(shi)(shi)(shi)高爐(lu)、熱(re)風爐(lu)、加熱(re)爐(lu)、動力鍋爐(lu)、石灰窯(yao)、回(hui)轉窯(yao)、玻璃窯(yao)、陶瓷和(he)(he)(he)耐火磚(zhuan)(zhuan)(zhuan)燒成(cheng)(cheng)(cheng)窯(yao)中(zhong)常用(yong)的(de)(de)耐火磚(zhuan)(zhuan)(zhuan)。