1. Aluminium rau silicon piv: A / S (aluminium trioxide / silica) feem ntau yog siv. Qhov siab dua ntawm aluminium rau silicon piv, qhov zoo dua.
2. Aluminium trioxide cov ntsiab lus: Cov ntsiab lus siab dua, cov ntxhia zoo dua.
3. Mineral impurities muaj nyob rau hauv bauxite: Mineral impurities hauv bauxite muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm alumina. (Kev yooj yim ntawm kev tawg: gibbsite> boehmite> diaspore)
Lub ntiaj teb tag nrho cov peev txheej bauxite muaj ntau, thiab lub sijhawm lav zoo li qub ntawm cov pov thawj pov thawj yog ntau tshaj 100 xyoo, tab sis cov peev txheej faib tsis sib xws.
