No ka loaʻa ʻana o ka alumini mai ka bauxite ʻo ia ka haʻalele ʻana i ka alumini trioxide mai ka bauxite.No ka hoʻokō ʻana i ke kumu, ʻekolu mau ala e pili ana: ke ʻano waika, ke ʻano alkali, ke ʻano hui ʻana i ka acid-base a me ke ʻano wela.Eia nō naʻe, ʻaʻole hoʻohana ʻia ke ʻano acid, acid-base combined method a me thermal method i ka nui o ka ʻoihana ma muli o ka palekana a me nā pono waiwai.Hoʻohana ʻia ke ʻano alkaline i ka hana ʻoihana.

He 3 mau ala no ka unuhi ʻana i ka alumina trioxide me ka hoʻohana ʻana i ke ʻano alkaline ʻo ia ke ʻano calcination, bayer method a me ke ʻano hui.E lawe mākou i ke ʻano calcination ma ke ʻano he laʻana.

Ke ʻano hoʻolāʻau: Hoʻokomo ʻana i kekahi nui o ka calcium carbonate i loko o ka bauxite, kahi mea nona ka mea nui he sodium aluminate i hana ʻia ma hope o ka hoʻolāʻau ʻana i ka wela kiʻekiʻe i loko o kahi kiln rotary.Loaʻa ka alumina hope loa ma hope o ka hoʻoheheʻe ʻana, ka crystallization a me ka ʻala.