Zvidhinha zve-alumina zvakakwirira imhando yezvinhu zvinorambidzika zvinonyanya kuumbwa nealuminum oxide (Al₂O₃).
Bricks with an Al₂O₃ content exceeding 90% are classified as corundum bricks. Standards vary by country due to differences in available resources; for instance, European standards set the minimum Al₂O₃ content for high-alumina refractories at 42%. In China, high-alumina bricks are typically categorized into three grades based on Al₂O₃ content: Grade I (>75%), Giredhi II (60–75%), uye Giredhi III (48–60%).
Aya aluminosilicate refractory zvigadzirwa zvine aluminium oxide (Al₂O₃) yemukati inodarika 48%.
Iwo imhando yezvakarerekera refractory zvinhu zvine alumina yemukati inopfuura 48%, inogadzirwa nekuumbwa uye calcining bauxite kana zvimwe mbishi zvinhu zvakapfuma mualuminium. Ivo vanoratidza kugadzikana kwakanyanya kwemafuta uye refractoriness inopfuura 1770 degree. Nekupokana kwakanaka kweslag, anoshandiswa kurongedza mavira emagetsi ekugadzira simbi, magirazi ekunyunguduka, uye simende rotary kilns.
Yakakwirira{{0}mutoro-inopfava, yakaderera{2}}inokwira yakakwirira-zvidhinha zvealumina [1] zvidhinha zvemhando yepamusoro zvinogadzirwa zvakanyanya kubva-giredhi rebauxite, fused corundum, uye fused mullite. Zvidhinha izvi zvinopa zvakanakira sekudzika-kudzika kwe tembiricha, kusimba kwekukukurwa kwevhu, uye kugadzikana kwekushisa kwakanyanya.
Inokodzera zvitofu zvihombe nezviri pakati nepakati, zvinomiririra danho rakabudirira mukugadzirwa kwemumba-kwemhando yepamusoro,{2}yepamusoro{2}yegiredhi refractory zvinhu zvaimbounzwa kunze kwenyika{3}}zvitsva zvechizvarwa chenyika yangu; chigadzirwa ichi chakaverengerwa munyika "Spark Chirongwa."