He mea inorganic ka aluminium oxide me ke ʻano kemika A1203, he hui paʻakikī loa me kahi kiko heheʻe o 2054°C a me kahi kiko paila o 2980°C. He kristal ionic ia hiki kei hoʻohuihui ʻiai nā mahana kiʻekiʻe a hoʻohana pinepine ʻia i ka hana ʻana i nā mea refractory. Loaʻa i ka alumina Calcined a me ka alumina nā mea like, akā ma muli o kekahi mau ʻano hana a me nā ʻokoʻa kaʻina hana ʻē aʻe, no laila e loaʻa kekahi mau ʻokoʻa i ka hoʻohana ʻana i ka hana.
ʻO Alumina ka mineral nui o ka alumini ma ke ʻano, e kuʻi ʻia a hoʻomoʻa ʻia me ka hopena sodium hydroxide wela kiʻekiʻe e loaʻa ai ka hopena sodium alumina; kānana e wehe i ke koena, e hoʻomaʻalili i ka filtrate a hoʻohui i nā kristal aluminium hydroxide, ma hope o ka hoʻoulu ʻana i ka manawa lōʻihi, e palaho ka hopena sodium alumina a hoʻoulu i ka alumini hydroxide; e hoʻokaʻawale i ka precipitate a holoi iā ia, a laila calcine iā ia ma 950-1200°C e loaʻa ai ka pauka alumina ʻano-c, ʻo ka Alumina calcined he alumina ʻano-c. He kiʻekiʻe loa nā kiko heheʻe a me ka paila.
ʻAʻole hiki ke hoʻoheheʻe ʻia ka alumina calcined i ka wai a me ka waikawa, i ʻike ʻia hoʻi ʻo alumini oxide i ka ʻoihana, a ʻo ia ke kumu maka no ka hana ʻana o ka metala alumini; hiki ke hoʻohana ʻia i ka hana ʻana o nā piliki refractory like ʻole, nā ipu hoʻoheheʻe refractory, nā paipu refractory a me nā mea hana hoʻokolohua pale wela kiʻekiʻe; hiki ke hoʻohana ʻia ma ke ʻano he abrasive, flame retardant a me ka hoʻopiha; ʻo ka alumina calcined maʻemaʻe kiʻekiʻe ke kumu maka no ka hana ʻana o ka corundum artificial, ka pōhaku haku ʻulaʻula artificial a me ka pōhaku haku polū; hoʻohana ʻia hoʻi no ka hana ʻana i nā substrates papa no nā kaapuni hoʻohui nui o kēia wā. ʻO ka alumina calcined a me ka alumina i ke kaʻina hana a me nā ʻano ʻē aʻe he ʻokoʻa iki, ʻokoʻa hoʻi nā wahi ʻoihana pili, no laila i ke kūʻai ʻana i nā huahana ma mua o ka mea mua e ʻike i nā wahi kikoʻī o ka hoʻohana