Aluminum oxide
Properties: farin m insoluble a cikin ruwa, wari, m, sosai wuya, sauki sha danshi ba tare da delixing (kona danshi).Alumina wani nau'in amphoteric oxide ne na yau da kullun (corundum mai siffa α ne kuma yana cikin marufi hexagonal mafi girma, fili ne wanda ba shi da ƙarfi, mai narkewa a cikin acid da juriya na alkali [1]), mai narkewa a cikin inorganic acid da maganin alkaline, kusan maras narkewa cikin ruwa. da kaushi na kwayoyin halitta marasa iyaka;Dangantaka mai yawa (d204) 4.0;Matsayin narkewa: 2050 ℃.
Adana: A kiyaye kuma a bushe.
Amfani: Ana amfani da shi azaman reagent na nazari, rashin ruwa mai narkewa, adsorbent, mai kara kuzari, abrasive, wakili mai gogewa, albarkatun ƙasa don narkar da aluminum, refractory
Babban sinadaran
Alumina ya ƙunshi abubuwan aluminum da oxygen.Idan bauxite albarkatun kasa ta hanyar sinadaran magani, cire oxides na silicon, baƙin ƙarfe, titanium da sauran kayayyakin ne sosai tsarki alumina albarkatun kasa, Al2O3 abun ciki ne kullum fiye da 99%.Tsarin ma'adinai ya ƙunshi 40% ~ 76% γ-Al2O3 da 24% ~ 60% α-Al2O3.γ-Al2O3 yana canzawa zuwa α-Al2O3 a 950 ~ 1200℃, tare da raguwar ƙarar girma.
aluminum oxide (aluminium oxide) ne irin inorganic, sinadaran irin Al2O3, shi ne wani irin high taurin mahadi, narkewa batu na 2054 ℃, tafasar batu na 2980 ℃, ionized crystal a high zafin jiki, sau da yawa amfani a yi na refractory kayan. .
An shirya alumina masana'antu ta bauxite (Al2O3 · 3H2O) da diaspore.Don Al2O3 tare da buƙatun tsafta, gabaɗaya an shirya shi ta hanyar sinadarai.Al2O3 yana da heterocrystals masu kama da juna da yawa, akwai fiye da 10 da aka sani, akwai galibi nau'ikan crystal 3, wato α-Al2O3, β-Al2O3, γ-Al2O3.Daga cikin su, tsarin da kaddarorin sun bambanta, kuma α-Al2O3 kusan an canza shi zuwa α-al2o3 a babban zafin jiki sama da 1300 ℃.
Kaddarorin jiki
InChI = 1 / Al 2 o/rAlO ₂ / c2-1-3
Nauyin Kwayoyin: 101.96
Matsayin narkewa: 2054 ℃
Tushen tafasa: 2980 ℃
Yawan gaske: 3.97g/cm3
Sako da marufi yawa: 0.85 g/ml (325 raga ~ 0) 0.9 g/ml (120 raga ~ 325 raga)
Tsarin Crystal: tsarin hex tripartite
Solubility: maras narkewa a cikin ruwa a zafin jiki
Ƙarfin wutar lantarki: Babu motsin wutar lantarki a zafin jiki
Al₂O₃ shine crystal ionic
Alumina part amfani ---- wucin gadi corundum
Corundum foda taurin za a iya amfani da abrasive, polishing foda, high zafin jiki sintered alumina, da ake kira wucin gadi corundum ko wucin gadi gemstone, za a iya yi da inji bearings ko agogon a cikin lu'u-lu'u.Hakanan ana amfani da alumina azaman kayan haɓakar zafin jiki mai ƙarfi, yin tubali mai jujjuyawa, crucible, ain, duwatsu masu daraja na wucin gadi, alumina kuma shine ɗanyen narkewar aluminum.Calcined aluminum hydroxide zai iya samar da γ-.Gamma-al ₂O₃ (saboda ƙarfin tallan sa da kuma aikin motsa jiki) ana iya amfani da shi azaman abin talla da mai kara kuzari.Babban bangaren corundum, alpha-al ₂O₃.Lura mai sassa uku a siffar ganga ko mazugi.Yana da kyalli na gilashi ko lu'u-lu'u.A yawa ne 3.9 ~ 4.1g / cm3, da taurin ne 9, da narkewa batu ne 2000 ± 15 ℃.Insoluble a cikin ruwa, kuma maras narkewa a cikin acid da tushe.High zafin jiki juriya.Farin Jade mara launi mara launi, mai ɗauke da burbushin jajayen chromium ja wanda aka sani da ruby;Launi mai shuɗi mai ɗauke da ƙarfe biyu -, uku - ko huɗu - ana kiran sapphire;Ya ƙunshi ƙaramin adadin ferric oxide duhu launin toka, launi mai duhu da ake kira corundum foda.Ana iya amfani da shi azaman bearings don ainihin kayan kida, lu'u-lu'u don agogo, ƙafafun niƙa, goge, refractories da insulators na lantarki.An yi amfani da duwatsu masu daraja masu haske don ado.Roba Ruby guda crystal Laser abu.Baya ga ma'adanai na halitta, ana iya yin shi ta hanyar hydrogen da harshen wuta na oxygen narke aluminum hydroxide.
Alumina yumbura
Alumina ya kasu kashi alumina calcined da alumina masana'antu na yau da kullun.Calcined alumina shine muhimmin albarkatun ƙasa don samar da tubalin tsoho, yayin da alumina na masana'antu za'a iya amfani dashi don samar da dutsen microcrystalline.A cikin glaze na gargajiya, ana amfani da alumina sau da yawa azaman farar fata.Amfani da alumina kuma yana ƙaruwa kowace shekara yayin da bulo-bulo na tsoho da duwatsun microcrystalline ke da fifiko a kasuwa.
Saboda haka, alumina yumbura ya fito a cikin masana'antar yumbu - alumina yumbu wani nau'in kayan yumbu ne tare da Al₂O₃ a matsayin babban albarkatun ƙasa da corundum a matsayin babban lokaci na crystalline.Saboda ƙarfin ƙarfin injinsa, babban taurinsa, babban asarar dielectric mai girma, juriya mai zafin jiki mai ƙarfi, juriya na lalata sinadarai da kyawawan halayen thermal da sauran fa'idodin ingantaccen aikin fasaha.
