Njerwa Zapamwamba za Alumina

Njerwa yapamwamba ya alumina ndi mtundu wa refractory, chigawo chachikulu chomwe ndi Al2O3. Ngati zomwe zili mu Al2O3 ndizoposa 90%, zimatchedwa njerwa ya corundum. Chifukwa cha zinthu zosiyanasiyana, miyezo ya mayiko osiyanasiyana sikugwirizana kwathunthu. Mwachitsanzo, m'mayiko a ku Ulaya, malire otsika a Al2O3 opangidwa ndi alumina refractories apamwamba ndi 42%. Mu China, Al2O3 zili mu mkulu aluminiyanje njerwa zambiri ogaŵikana giredi atatu: Kalasi I - Al2O3 okhutira> 75%; kalasi II - Al2O3 zili 60-75%; kalasi III - Al2O3 zili 48-60%.

Mawonekedwe:
1. High refractoriness
2.Kutentha kwakukulu kwamphamvu
3.Kukhazikika kwa kutentha kwapamwamba
4.Nyengo zokanira
5.Kukana kwabwino kwa asidi ndi dzimbiri la slag
6.High refractoriness pansi pa katundu
7.Kutentha kwakukulu kukana kukwawa
8.Low zowoneka porosity