Kuti uwane aluminium kubva ku bauxite kazhinji zvinoreva kusiya aluminium trioxide kubva ku bauxite.Kusvika pachinangwa pane nzira nhatu dzinosanganisira: nzira yeasidhi, nzira yealkali, acid-base yakasanganiswa nzira uye nzira yekupisa.Nekudaro, iyo acid nzira, acid-base yakasanganiswa nzira uye nzira yekupisa haishandiswe muhuwandu hwakawanda muindasitiri nekuda kwekuchengetedza uye hupfumi hunobatsira.Iyo alkaline nzira inoshandiswa mukugadzirwa kwemaindasitiri.

Pane nzira nhatu dzekubvisa alumina trioxide uchishandisa alkaline nzira inova nzira yecalcination, bayer nzira uye yakasanganiswa nzira.Tichatora calcination nzira semuenzaniso.

Calcination method: Kuisa imwe chiyero che calcium carbonate mu bauxite, chinhu chine chikamu chikuru chinonzi sodium aluminate chinoumbwa mushure mekuverengera kwekushisa kwepamusoro muchoto chinotenderera.Pakupedzisira alumina inowanikwa mushure mekuparadzwa, crystallization uye kugocha.