Chiyambi cha njerwa zadongo zokana

Njerwa zadongo zimatanthawuza zinthu zadongo zomwe zili ndi Al2O3 zomwe zili ndi 30% -40% aluminiyamu silicate zipangizo. Njerwa zadongo zimapangidwa ndi 50% dongo lofewa ndi 50% zolimba zadongo, zomwe zimamangidwa molingana ndi zofunikira zina za tinthu. Akamaumba ndi kuyanika, amawotchedwa pa kutentha kwakukulu kwa 1300 ~ 1400 ℃. The mchere zikuchokera njerwa dongo makamaka kaolinite (Al2O3 · 2SiO2 · 2H2O) ndi 6% ~ 7% zonyansa (oxides wa potaziyamu, sodium, calcium, titaniyamu, ndi chitsulo). Kuwotcha kwa njerwa zadongo makamaka ndi njira yowonongeka kosalekeza ndi kuwonongeka kwa kaolin kupanga makristasi a mullite (3Al2O3 · 2SiO2). SiO2 ndi Al2O3 mu njerwa zadongo zimapanga eutectic low-melting silicate ndi zonyansa panthawi yowombera, zomwe zimazungulira makristasi a mullite.

Njerwa zadongo ndi zinthu zofooka za acidic refractory, zomwe zimatha kukana kukokoloka kwa acidic slag ndi mpweya wa asidi, ndipo zimakhala zofooka pang’ono kukana zinthu zamchere. Njerwa zadongo zimakhala ndi kutentha kwabwino ndipo zimagonjetsedwa ndi kuzizira kofulumira komanso kutentha kwambiri.