Lebenkii spinel ee Magnesia alumina

Lebenkii spinel -ka ee Magnesia alumina waxay isticmaalaan magnesia lebenkii hoose iyo ciiddii magnesia alumina sandel oo leh saamiga C/S ee 0.4 sida alaabta ceeriin ah, oo leh cabbir walxaha muhiimka ah ee 3mm. Cabbirka walxaha magnesia wuxuu qaataa 3 ~ 1mm walxaha waaweyn, <1mm walxaha dhexdhexaadka ah iyo <0.088mm budo fiican sida maaddooyinka saddex-heer ah. U isticmaal dareeraha qashin -qubka sulfite sidii wakiil wax ku qabanaya, ku qas dhagax -qoyan, oo ku qaabee 300t jaraa’id oo leben ah. Ka dib marka jirka qallalan la qallajiyo, waxaa lagu shubaa 1560 ~ 1590 ° C. Jawiga oksaydhka oo daciif ah waa in la xakameeyaa inta ay socoto hawsha dabka.

Guryaha farsamada ee heerkulka sarreeya iyo xasilloonida shoogga kaamerada ee lebenka periclase-spinel ayaa ka fiican kuwa lebenka alumina ee magnesia caadiga ah. Awoodda cadaadiska ee heerkulka qolka waa 70-100MPa, iyo xasilloonaanta shoogga kulaylka (1000 ℃, qaboojinta biyaha) waa 14-19 jeer. Lebenkii periclase-spinel waxaa loo adeegsan karaa aagga heerkulka sare ee leenyada firfircoon ee lime-ka-rogaha ah iyo kuwa sibidhka leh

spinel-ka magnesium-aluminium ee dalkaygu wuxuu qaataa laba hab oo wax soo saar: sintering iyo fusion. Alaabta ceeriin ah ayaa inta badan ah magnesite iyo budada alumina ee warshadaha ama bauxite. Sida laga soo xigtay tilmaamayaasha kala duwan ee magnesia iyo alumina, spinel-ku hodansan spinel iyo spinel-hodan aluminium ayaa lagu kala saaraa oo lagu dabaqaa goobo kala duwan.

1. Sida waafaqsan habka wax soo saarka ama habka: sintemiin aluminium spinel spinel (sintered spinel) iyo fusuum magnesium spinel spinel (fused spinel).

2. Sida ku cad alaabta ceyriin ee wax soo saarka, waxaa loo qaybin karaa: bauxite-ku-saleysan magnesia-aluminium spinel iyo alumina-ku-saleysan magnesia-aluminium spinel. (Sintering ama electrofusion)

3. Marka loo eego nuxurka iyo waxqabadka, waxaa loo qaybiyaa: spinel hodan ku ah magnesium, spinel aluminium hodan ah iyo spinel firfircoon.

Lebenka spinel ee Magnesia alumina waxaa sidoo kale loo yaqaan periclase-spinel leben, kaas oo ka samaysan nadiif aad u sarreeya oo magnesia la isku daray ama daahirnimo sare leh oo laba-tallaabo magnesia calcined ah iyo daahirnimo sare leh oo horay loo soo saaray macne-aluminium spinel sida alaabta ceeriin ee ugu weyn, iyadoo la isticmaalayo maaddooyinka saxda ah Form Samaynta cadaadis sare iyo hannaanka wax-soo-saarka dabka oo heerkulkiisu sarreeyo. Marka la barbardhigo lebenkii magnesia-chromium, lebenkan isku-dhafan ee magnesia-aluminium ma aha oo kaliya baabi’inta waxyeellada chromium hexavalent, laakiin sidoo kale wuxuu leeyahay iska caabin daxalka wanaagsan, iska-caabbinta dhimista oksaydhka, iska caabinta kulaylka iyo xasiloonida mugga heerkulka sare. Waa sibidh weyn iyo dhexdhexaad Dhex-dhexaadka ugu habboon ee aan lahayn chromium-ka ee aagga kala-guurka ee weelka Rotary. Waxa kale oo loo isticmaalay qalab heer-kulkiisu sarreeyo sida kuwa liin dhagaxa ah, dhalooyinka galaaska ah, iyo qalabka wax lagu sifeeyo ee foornada ka baxsan, sidoo kale waxay gaadhay natiijooyin wanaagsan.

Tilmaamaha jirka iyo kiimikada ee lebenkii spinel ee magnesium-aluminium ee la soo saaray waa: MgO 82.90%, Al2O3 13.76%, SiO2 1.60%, Fe2O3 0.80%, porosity muuqda 16.68%, cufnaanta jumlada 2.97g/cm3, heerkulka caadiga ah ee xoogga cadaadiska 54.4MPa, 1400 strength xoogga dabacsanaanta 6.0MPa.

Lebenkii spinel-ka ee Magnesium-aluminium ayaa si guul leh loogu isticmaalay aagga kala-guurka ee shamiinnada sibidhka ee sibidhka, laakiin waxay u nugul yihiin dhisidda iyo dhidib-dhisidda marka loo adeegsado aagga dabka, way adag tahay in la sudho maqaarka dheriga, oo waxay leeyihiin iska caabin liidata uumi alkali iyo sibidh clinker permeability wejiga. Awoodda liidata ee iska caabinta culayska farsamada ee ay keento qallooca jirka kilyaha ayaa xaddidaya codsiga aagga dabka. Sababtan awgeed, cilmi-baarayaashu waxay soo saareen lebenkii laf-dhabarta ee magnesia-aluminium-ku-habboonaa aagga dab-damiska ee sibidhka roogga. Inta lagu jiro xabbinta iyo isticmaalka, qayb ka mid ah Fe2+ oo ku jirta qaab-dhismeedka curyaaminta periclase-spinel ayaa oksaydhka ku ah Fe3+. Intaas ka dib, qayb ka mid ah Fe2+ iyo Fe3+ oo ku jirta laf-dhabarta bir-aluminiumku waxay ku faaftaa shaxda periclase si ay u samayso MgOss. Isla mar ahaantaana, xoogaa Mg2+ oo ku jira shaxanka ayaa sidoo kale ku faafa qaybaha bir-aluminium-aluminium, waxayna la falgashaa Al2O3-ka soo haray ka-soo-daadinta bir-aluminium spinel si ay u samayso spinel magnesium-aluminium. Falcelintaan taxanaha ah waxaa weheliya ballaarinta mugga, taasoo horseedaysa sameynta microcracks. Ku

Lebenkii bir-aluminiumka ee birta-aluminiumku waxay leeyihiin guryo ku laalaada dabka wanaagsan iyo iska-caabbinta shoogga kulaylka. Iyaga dhexdooda, sababta sababta birta aluminiumka birta ah ay si fiican ugu sudho maqaarka dheriga waxay la mid tahay tan lebenka mafic-iron spinel. Waxa kale oo sabab u ah ficilka CaO ee xarigga sibidhka iyo Fe2O3-adag ee milmay periclase si loo sameeyo kiristaalo qoyan kara periclase-ka. , Calcium ferrite oo isku xidha clinker iyo firebrick wada. Sababta iska caabbinta naxdinta kuleylka ee wanaagsan ayaa ah sameynta microcracks.

Nidaamka MgO-Al2O3, xaddiga xalka adag ee Al2O3 ee periclase ee 1600 ° C wuxuu ku saabsan yahay 0; xaddiga xalka adag ee 1800 ° C waa kaliya 5%, taas oo aad uga yar Cr2O3. Nidaamka MgO-Al2O3, xarunta kaliya ee ikhtiyaariga ah waa spinel aluminium aluminium. Meesha dhalaalaysa ee aluminium aluminium spinel waa ilaa 2135 ℃, iyo heerkulka ugu hooseeya ee MgO-MA sidoo kale waa 2050 ℃. Spinel-Magnesium-aluminium waa macdan dabiici ah, oo inta badan laga helo kaydinta ciidda, sidaa darteed waxay leedahay xasillooni kiimiko oo wanaagsan oo alaabta dabiiciga ah.

Modulus of elasticity waa yar yahay, lebenkii alumina magnesia (0.12 ～ 0.228) × 105 MPa, halka lebenka magnesia uu yahay (0.6 ～ 5) × 105MPa; MA waxay ka wareejin kartaa MF periclase, waxayna xaaqi kartaa FeO. Dareen -celintu waa sida soo socota: FeO+MgO • AI2O3 → MgO+FeAl2O4, FeO+MgO → (Mg • Fe) O, MA waxay nuugtaa Fe2O3 oo xoogaa u fiddaa oo waxay leedahay meel dhalaalaysa oo sare. Spinel wuxuu leeyahay dhibic dhalaalaysa oo ah 2135 ° C, heerkulka dhalaalid ee bilowga leh periclase wuxuu ka sarreeyaa 1995 ° C. Isku -darka labada ayaa wanaajin doona waxqabadka isku -xirnaanta lebennada magnesia. Heerkulka jilcinta culayska ayaa sarreeya, laakiin samaynta laf -dhabarta waxaa weheliya ballaarinta mugga, iyo isku -darka iyo kartida dib -u -kicinta ayaa daciif ah, sidaa darteed heerkul dab ka sarreeya ayaa loo baahan yahay. Iska caabin shoogga heer sare heer sare ah. xoog sare. Caabin nabaadguur oo xoog leh.