Amatafari maremare - alumina ni ubwoko bwibikoresho byo kuvunika bikozwe no kurasa ibumba ryangiritse cyangwa ibindi bikoresho fatizo biva mu bushyuhe bwinshi; ni abo mu muryango wa aluminosilicate. Amatafari yamenetse ni organic organique non - ibikoresho byuma biboneka muburyo butandukanye, harimo - alumina, ibumba, magnesia, corundum, mullite, n'amatafari ya karbide ya silicon. Bitewe nuburyo bwiza bwo kuvunika, amatafari maremare - alumina akoreshwa cyane mubwoko butandukanye bwamatafari. Ukurikije ibipimo ngenderwaho byo hejuru - ibikoresho byo kwanga alumina, ibikubiye muri Al₂O₃ nibyo bipimo ngenderwaho. By'umwihariko, amatafari maremare - alumina yashyizwe mu byiciro bitatu: Icyiciro cya I (Ibirimo Al₂O₃> 75%), Icyiciro cya II (Ibirimo Al₂O₃ biri hagati ya 60% na 75%), n'icyiciro cya III (Ibirimo Al₂O₃ biri hagati ya 48% na 60%).
Nubwoko bwibikoresho byangiritse, hejuru - amatafari ya alumina agizwe ahanini na Al₂O₃. Ugereranije n'amatafari y'ibumba na kimwe cya kabiri - amatafari ya silika, amatafari maremare - alumina yerekana ububobere buke bityo bikaba byashyizwe mu rwego rwo hejuru - ibikoresho byo mu rwego rwo hejuru. Ibirimo byinshi bya Al₂O₃ bibaha hafi - biranga kutabogama, bigafasha kurwanya isuri haba acide na shitingi yibanze. Ariko, birakwiye ko tumenya ko nubwo harimo SiO₂, kurwanya kwabo kwibanze kurutwa gato no kurwanya aside acide. Ukurikije ibirimo Al₂O₃, hejuru - amatafari ya alumina arashobora kugabanywa mu byiciro nka 55, 65, 75, na 80.
Amatafari maremare - alumina ashyirwa mubyiciro bitandukanye ukurikije Al₂O₃ (aluminium oxyde). Muri byo, amatafari ya corundum - hamwe na aluminiyumu ya 90% cyangwa irenga - byerekana urwego rwo hejuru rw’amatafari ya - alumina. "Icyiciro cyihariye" hejuru - amatafari ya alumina arimo byibuze 85% aluminium, mugihe amatafari yo mu cyiciro cya mbere arimo hejuru ya 75%; Amatafari yo mu cyiciro cya II nicyiciro cya III arimo byibura 65% na 55% ya aluminium. Aya manota atandukanye atanga imitungo itandukanye kugirango yuzuze ibisabwa bitandukanye byinganda. Amatafari maremare - alumina ni ubwoko bwibicuruzwa bivunika bya aluminiyose birangwa na oxyde ya aluminium (Al₂O₃) irenga 48%. Iyo ibirimo Al₂O₃ bigeze kuri 90% cyangwa birenga, bashyirwa mumatafari ya corundum - amatafari maremare - alumina itanga imikorere idasanzwe yo kwanga. Birakwiye ko tumenya ko ibipimo byamatafari yo hejuru - alumina bishobora gutandukana mubihugu kubera itandukaniro ryumutungo uhari.
Kurugero, mubihugu byu Burayi, byibuze Al₂O₃ yibikoresho byo hejuru - ibikoresho byo kuvunika alumina byashyizwe kuri 42%. Mu Bushinwa, ariko, amatafari maremare - alumina ashyirwa mu byiciro bitatu: Amatafari yo mu cyiciro cya mbere arimo hejuru ya 75% Al₂O₃; Amatafari yo mu cyiciro cya II arimo hagati ya 60% na 75% Al₂O₃; Amatafari yo mu cyiciro cya III arimo hagati ya 48% na 60% Al₂O₃.