Lub cystal ua cov alumina hlaws peb lub tuam txhab tuaj yeem tsim:
1. γ-Al2O3 hlaws
be-Al2O3 hlaws tau los ntawm calcination ntawm boehmite ntawm qhov kub tsawg (500-750 ° C). um alumina hlaws yog qhov system cubic siv lead ua. Nws yog qhov ntxeem tau, zoo-cov khoom tawg yooj yim nrog qhov chaw tshwj xeeb cheeb tsam thiab kev ua haujlwm siab. Cov ntawv tshaj tawm adsorption zoo. Nws yog dav siv nyob rau hauv ntau yam lag luam ntawm adsorbents thiab cov neeg sawv cev rau lub cev qhuav dej, kho tsheb cov pa roj hauv lub cev; npaj aerospace, riam phom, electronics, tshwj xeeb ceramics thiab lwm yam ntaub ntawv, siv nyob rau hauv petrochemical thiab tshuaj lom neeg kev lag luam raws li catalyst (kho roj av) los yog cov cab kuj (los hydrogenate roj av).
Nano-γ-Al2O3CMP (Chemical Mechanical Polishing) slurry tuaj yeem siv rau cov nplaim hluav taws xob ntawm kev sib txuam ntawm cov txheej txheem sib txuas, aluminium, tooj liab thiab lwm cov ntaub thaiv xov hlau thiab cov ntaub ntawv nyias cov yeeb yaj kiab hauv kev tsim hluav taws xob, nrog rau kev ua kom zoo ntawm cov iav, quartz siv lead ua thiab ntau lub pov haum gemstone. Neeg kho tshuab polishing.
2. δ-Al2O3 hlaws dai
ad-Al2O3 hlaws tau los ntawm calcination ntawm boehmite ntawm 800 ～ 1 050 ° C. δ alumina hlaws yog qhov system tetragonal nrog muaj zog adsorption muaj peev xwm thiab qhov kev ua haujlwm catalytic. Nws tuaj yeem raug siv ua adsorbent, desiccant , catalyst thiab cov cab kuj .
3. Cov hlaws dai η-Al2O3
be-Al2O3 hlaws tau txais los ntawm calcining txhuas hydroxide ntawm Bayer lub cev ntawm 400-750 ° C ntawm qee qhov ntsuas cua sov. um alumina hlaws yog qhov cub siv lead ua qhov system nrog qhov loj pore ntim thiab qhov chaw tshwj xeeb hauv cheeb tsam. Nws mas siv raws li cab kuj rau lub catalyst.
4. θ-Al2O3 hlaws dai
be-Al2O3 hlaws tau txais los ntawm calcining txhuas hydroxide ntawm Bayer lub cev ntawm 900 ~ 1 100 ° C ntawm qee qhov ntsuas cua sov. um alumina hlaws yog lub zog monoclinic uas muaj cov khoom nruab nrab ntawm γ-Al2O3 thiab α-Al2O3. Feem ntau nyob ua ke nrog γ-Al 2 O 3 thiab α-Al 2 O 3.
5 κ-Al2O3 hlaws dai
be-Al2O3 hlaws tau txais los ntawm calcination ntawm gibront ntawm 800 ~ 1 150 ° C ntawm qee qhov ntsuas cua sov. -Al2O3 hlaws yog qhov ua xeb. Cov ntawv thov tseem ceeb yog cov kab rov tav uas zaws, cov khawb, cov adsorbents, thiab cov zoo li.
6 ρ-Al2O3
ρ-Al2O3 tau txais los ntawm lub cev qhuav dej ntawm gibarta tsawg dua 75 μm hauv qab nqus ntawm qis dua 2.66 Pa. ρ-Al2O3 muaj qhov tsis zoo crystallization thiab yuav luag nyob hauv lub xeev amorphous. -Al2O3 yog siv dav hauv cov khoom siv qib high-qib refractory cov khoom xws li corundum, siab-aluminium, thiab aluminium-magnesium, xws li kev ua hlau, ua hlau, tsis muaj hlau tsis zoo, thiab kub tawg ua kom sov. Tsis tas li ntawd, nws tseem siv dav hauv cov xim pleev xim, cov khoom thauj catalyst, adsorbents thiab cov zoo li.
7. Cov hlaws dai χ-Al2O3
ad-Al2O3 hlaws tau los ntawm calcination ntawm gibarta tsawg dua 75μm raws li qhov ua tiav ntawm cov roj thaiv ntawm 500 ～ 750 ° C. χ-Al2O3 tsuas yog siv rau kev ziab thiab lub cev qhuav dej ntawm huab cua, roj cua thiab roj av kom tawg. Cov catalyst tshwj xeeb rau kev tsim cov tshuaj hydrogen peroxide, dechlorination ntawm cov roj nplaum, cov roj av pabcuam, kev sib cais ntawm huab cua thiab cov pa oxygen.