Aluminium cov ntsiab lus faib

Cov ntsiab lus ntawm txhuas nyob rau hauv lub ntiaj teb crust yog thib ob tsuas yog oxygen thiab silicon, cov ntsiab lus ntawm 8.3%, qeb thib peb, yog cov hlau ntau tshaj plaws nyob rau hauv lub ntiaj teb crust, nws reserves nyob rau hauv lub thib ob qhov chaw nyob rau hauv cov hlau. Nyob rau hauv cov hlau ntau yam, thib ob tsuas yog steel, rau qhov thib ob loj qeb ntawm hlau. Nws feem ntau muaj nyob rau hauv aluminosilicate ores, nrog rau bauxite thiab cryolite. Alumina yog cov hmoov dawb amorphous uas tuaj nyob rau hauv ntau yam sib txawv, feem ntau paub txog uas yog -Al2O3 thiab -Al2O3. Corundum uas muaj nyob rau hauv xwm belongs rau -Al2O3, nws hardness yog thib ob tsuas yog pob zeb diamond, siab melting point, acid thiab alkali tsis kam, feem ntau siv los ua ib co bearings, manufacturing abrades, refractories. Xws li corundum crucible, tuaj yeem tiv taus 1800 degree siab kub. Al2O3 muaj ntau yam xim vim muaj cov impurities sib txawv. Piv txwv li, ib kab ntawm Cr(III) yog liab thiab hu ua ruby; Cov uas muaj Fe(II), Fe(III) lossis Ti(IV) yog hu ua sapphires.