Reactive Alumina

Reactive alumina raw khoom yog hais txog sintered lossis fused raw khoom nrog -Al2O3 raws li theem tseem ceeb, thiab Al2O3 cov ntsiab lus siab. Cov ntaub ntawv zoo li no nrog cov hardness siab, refractoriness yog tshaj 2050 degree. Nws muaj corrosion kuj ob qho tib si rau Alkali thiab Acid cov ntaub ntawv.

Reactive alumina hmoov yog tsim los ntawm bauxite, lub ntsiab ore ntawm txhuas. Cov bauxite ore muaj kev sib xyaw ntawm gibbsite, boehmite, hlau oxides, hlau hydroxides, quartz, thiab av nplaum ntxhia. Alumina yog muab rho tawm los ntawm cov txheej txheem Bayer, qhov twg cov tshuaj tiv thaiv Al2O3 (alumina hmoov) yog distilled los ntawm bauxite ntxhia sib tov.

Alumina muaj cov melting kub thiab boiling point, nrog rau cov hardness siab heev. Nws cov tshuab thiab compressive zog yog ob qho tib si siab dua ntau cov ntaub ntawv sib piv, thiab nws cov hluav taws xob tiv thaiv thiab thermal conductivity ua rau alumina qhov kev xaiv zoo tshaj plaws rau ntau yam khoom siv hluav taws xob.

Cov yam ntxwv tshwj xeeb uas ua rau alumina zoo tagnrho rau cov khoom siv txhuas kuj ua rau nws muaj txiaj ntsig zoo rau cov tswv ntawm lwm yam kev siv, tshwj xeeb tshaj yog cov uas yuav tsum tau muaj zog thiab tsis kam mus rau kev puas tsuaj lossis lwm yam khoom siv tshuaj. Alumina hmoov kuj zoo tagnrho rau cov khoom uas yuav tsum tau corrosion thiab hnav tsis kam, thiab rau cov khoom uas yuav tsum tau thermal conductivity, xws li hluav taws xob thiab thermally insulating daim ntaub ntawv.

Nyob rau hauv casting, activated alumina yog siv los ua ib txheej tiv thaiv rau smelting thiab casting, uas muaj peev xwm zoo tiv thaiv cov ntaub ntawv los ntawm corroded los ntawm oxygen thiab dej vapor nyob rau hauv cov huab cua, yog li txhim kho qhov zoo thiab ruaj khov ntawm casting cov ntaub ntawv. Tom ntej no yog lub qhov cub kub.

Nyob rau hauv siab -kub kilns, qee qhov siab -kub corrosion- cov ntaub ntawv uas tsis muaj zog refractory feem ntau yog siv, thiab activated alumina yog ib qho ntawm lawv. Nws zoo heev corrosion kuj thiab thermal stability tuaj yeem tiv thaiv kev tawg thiab hnav cov ntaub ntawv refractory ntawm qhov kub thiab txias, yog li txuas lawv lub neej kev pab cuam hauv qhov kub thiab txias.

Tsis tas li ntawd, activated alumina kuj tseem siv tau los ua lub siab -kub roj lim, uas tuaj yeem lim impurities hauv siab -kub roj thiab txhim kho kev siv roj.

Ntev Keter muab cov khoom siv dav dav, suav nrog alumina bauxite siab, Kaolin flint av nplaum, tabular alumina, alumina hmoov, xim av fused alumina, dawb fused alumina, magnesia spinel, mullite thiab lwm yam.