Cov khoom siv raw rau cov khoom siv refractory siv hauv kev tsim khoomsiab alumina cib, bauxite (cov khoom siv raw), feem ntau yog cais raws li cov ntsiab lus siab lossis qis ntawm AL2O3 (alumina). Al2O3 cov ntsiab lus ntau dua 75% yog cais raws li qib tshwj xeeb; 70% -75% yog cais raws li thawj theem; 60% -70% yog cais raws li Qib 2; 50% -60% yog cais raws li qib peb; 45% -55% yog cais raws li qib plaub. Cov ntsiab lus impurity yuav tsum tsawg dua 2.5% (qib tshwj xeeb yuav tsum muaj tsawg dua 2.0%), thiab cov ntsiab lus cao tsawg dua 0.6% (qib tshwj xeeb yuav tsum muaj tsawg dua 0.5%, thiab qib plaub yuav tsum tsawg dua 0.7%). Lub refractory kub yog siab tshaj 1770 degrees. High alumina bauxite tsuas yog tsim los ntawm boehmite yog cais raws li qib tshwj xeeb thiab qib thawj; Cov uas muaj qee cov av nplaum (kaolin) raug cais raws li theem nrab; Feem ntau tsim los ntawm kaolinite thiab muaj ntau npaum li cas ntawm boehmite, nws raug cais raws li qib peb.
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