Njerwa zazitali za alumina zimapangidwa ndi chamotte yosankhidwa ya bauxite ngati zinthu zazikulu zopangira, zoyatsidwa pa 1450-1470°C pogwiritsa ntchito njira yapamwamba komanso yowongolera bwino kwambiri. Njerwa zazitali za Alumina zimapangidwa ndi alumina kapena zinthu zina zopangira zomwe zili ndi alumina yambiri kudzera mu kuumba ndi kuyatsa. Chifukwa cha mphamvu yake yosalowerera ndale, alumina yokana ikhoza kukana kukana kukokoloka kwa asidi.
Njira Yaikulu Yopangira Njerwa za Alumina
Chotsani chamotte ya Select ndikusefa kuti ichotsedwe musanaswe, zomwe zingathandize kuti njerwa za alumina zikhale zabwino kwambiri. Chifukwa pali zosakaniza zambiri zomwe zimatha kufika 90-95%. Sankhani ndikuwunika kuchotsa grog isanaswedwe.
Magulu Atatu a Njerwa Yaikulu ya Alumina
Malinga ndi kuchuluka kwa Al2O3 kosiyanasiyana, njerwa zambiri za alumina zitha kugawidwa m'magulu atatu ku China.
Njerwa za Alumina High Giredi I zili ndi Al2O3 yoposa 75%.
Njerwa za Alumina High Giredi II zili ndi 60 ~ 75% ya Al2O3.
Njerwa za Alumina High Giredi III zili ndi 48~60% ya Al2O3.
Makhalidwe a Njerwa Yaikulu ya Alumina
Njerwa ya alumina yokhala ndi alumina yambiri ili ndi zinthu zabwino monga kutentha kwambiri, dzimbiri labwino komanso kukana kuwonongeka, kuchuluka kwakukulu, chitsulo chochepa, ndi zina zotero.
| Zinthu | Njerwa ya alumina yapamwamba kwambiri ya giredi yoyamba | Njerwa ya alumina yapamwamba kwambiri ya giredi yachiwiri | Njerwa ya alumina yapamwamba ya kalasi yachitatu | Njerwa yapadera ya alumina yapamwamba kwambiri |
| LZ-75 | LZ-65 | LZ-55 | LZ-80 | |
| Al2O3 % ≥ | 75 | 65 | 55 | 82 |
| Fe2O3 % ≤ | 2.5 | 2.5 | 2.6 | 2.0 |
| Kuchuluka kwa Zinthu Zochuluka g/cm3 | 2.5 | 2.4 | 2.3 | 2.6 |
| Mphamvu Yopondereza Yozizira MPa ≥ | 70 | 60 | 50 | 80 |
| 0.2MPa Kusagwira Ntchito Pansi pa Katundu ℃ | 1510 | 1460 | 1420 | 1550 |
| Kukana kwa mpweya ℃ ≥ | 1790 | 1770 | 1770 | 1790 |
| Kuoneka ngati Porosity % ≤ | 22 | 23 | 24 | 21 |
| Kukonzanso Kusintha kwa Linear 1450℃×2h % | -0.3 | -0.4 | -0.4 | -0.2 |
Kugwiritsa Ntchito Njerwa Yaikulu ya Alumina
Njerwa zazitali za alumina zingagwiritsidwe ntchito mu ng'anjo yophulika, chitofu chotentha, ng'anjo yamagetsi. Komanso njerwa zazitali za alumina zomwe zimagwiritsidwa ntchito m'minda yachitsulo ndi chitsulo, yopanda chitsulo, galasi, simenti, zoumba, petrochemical, makina, boiler, makampani opanga magetsi, magetsi, ndi mafakitale ankhondo ndi zina zotero.
