Alumina magnesia castables tam sim no yog cov khoom siv dav tshaj plaws hauv cov khoom siv hauv ladles. Cov neeg ua haujlwm refractory hauv tsev thiab txawv teb chaws tau ua haujlwm ntau ntawm txhuas-magnesium castables, feem ntau yog los ntawm cov khoom sib xyaw, magnesia, corundum nplua hmoov thiab micro hmoov, thiab silica. Micropowder thiab lwm yam qhia txog qhov cuam tshuam ntawm kev ua haujlwm ntawm aluminium-magnesium castables.
1. Xaiv cov kev sib sau ua ke
Cov alumina aggregates siv nyob rau hauv Alumina magnesia castables mas suav nrog fused alumina, sintered alumina thiab ntuj alumina clinker. Lub castable ua los ntawm fused siab alumina corundum li aggregate muaj qhov zoo tshaj plaws fluidity, thaum lub castable ua los ntawm alumina spinel muaj qhov phem tshaj thermal shock stability. Cov qauv xim av corundum aggregate muaj qhov zoo tshaj plaws fluidity. Nyob rau hauv cov nqe lus ntawm thermal shock stability, dawb corundum aggregate yog qhov zoo tshaj plaws, ua raws li xim av corundum aggregate, thiab bauxite clinker aggregate yog qhov phem tshaj.
2. Xaiv cov hmoov zoo corundum
Al2O3 nyob rau hauv corundum hmoov zoo tuaj yeem hnov mob nrog CaO hauv slag los ua CA2 thiab CA6 nrog cov ntsiab lus melting siab. Nyob rau tib lub sijhawm, vim muaj cov cation defects nyob rau hauv aluminium-nplua nuj spinel, nws tuaj yeem ntes FeO thiab MnO hauv cov slag los ua (Mg, Fe, Mn) O·Al2O3, SiO2 cov ntsiab lus hauv slag nce, thiab Lub viscosity ntawm slag nce, uas tuaj yeem txhim kho cov slag corrosion kuj thiab slag nkag mus rau cov qauv. Piv nrog cov ntshiab calcium aluminate cement-bound castables, lub matrix ntawm ρ-Al2O3- khi castables yog purer, extending lub neej kev pab cuam ntawm Alumina magnesia castables .
3. Spinel piv
Cov tshuaj formula ntawm magnesia-aluminium spinel yog MgO·Al2O3, thiab nws cov ntsiab lus theoretical yog MgO28.3% thiab Al2O371.7%. Magnesium-nplua nuj spinel feem ntau yog siv los ua kiln hauv ob sab phlu rau cov cement kiln loj. Aluminium-nplua nuj spinel feem ntau ua ke nrog Al2O3 raw cov ntaub ntawv los tsuas yog tsim loj thiab nruab nrab ladle castables los yog prefabricated qhov chaw thiab tshwj xeeb qhov chaw xws li ladle breathable cib thiab lub rooj bricks. Alumina-raws li spinel castables synthesized los ntawm ntuj raw cov ntaub ntawv yog tsuas yog siv rau me me ladle castables.
4. Magnesia cov ntsiab lus
Magnesium oxide, raws li lub ntsiab raw khoom rau in-situ spinel tiam nyob rau hauv Alumina magnesia castables, muaj ib tug tseem ceeb cuam tshuam rau lub zog, ntim stability, slag kuj thiab thermal shock stability ntawm tus qauv. Raws li qhov sib ntxiv ntawm magnesia nce, cov slag yaig tsis kam ntawm cov qauv txo qis thiab cov slag nkag mus kuj nce. Txawm li cas los xij, thaum ntxiv magnesia ntau dhau lawm, cov khoom siv tau xoob, ua rau txo qis hauv slag kuj.
5. Silica hmoov
Silica hmoov muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm ntawm alumina magnesia castables, uas yog qhov tseem ceeb hauv cov hauv qab no: siv silica hmoov hauv Aluminia magnesia refractory castables tuaj yeem txo cov dej ntxiv, inhibit magnesia hydration, nce fluidity, thiab txhim kho kev tsim kho. Kev ua tau zoo: Ntawm ib sab, ntxiv silica hmoov yuav tsim cov theem qis (anorthite, anorthite, forsterite thiab rhodonite) nrog MgO, CaO, thiab Fe2O3 nyob rau hauv cov qauv, uas yog detrimental rau high-temperature kev ua tau zoo ntawm cov qauv, tab sis Ntawm qhov tod tes, qhov no tuaj yeem siv los kho qhov ntim nthuav dav nrog cov tshuaj tiv thaiv spinel thiab ua kom cov tshuaj tiv thaiv spinel.
