Cov txheej txheem sim
Siv tabular corundum, fused corundum, sintered aluminium-magnesium spinel, fused magnesia, -Al2O3 micropowder, silica micropowder thiab ntshiab calcium aluminate cement, thiab lwm yam. Qhuav ntawm 110 degree, firing ntawm 1000 degree × 3h thiab 1500 degree × 3h.
Txheeb xyuas cov porosent porosity, kev ceev, lub zog hloov pauv, linear hloov lub zog ntawm cov qauv tom qab kev kho mob ntau raws li GB; kuaj cov qauv hloov pauv ntawm cov qauv hauv qab load, lub siab yog 0.196 MPa, cua sov tus nqi yog 10 degree / min, qhov siab tshaj plaws kub yog 1500 degree, thiab qhov kub thiab txias yog khaws cia rau 3h; qhov kev sim slag kuj siv txoj kev crucible, thiab qhov kawg slag ntawm lub converter (wCaO36.84 feem pua, wSiO214.77 feem pua, wAl2O328.17 feem pua, wFeO7.95 feem pua, wMnO4 .58 feem pua) 150g tau muab tso rau hauv lub crucible, thiab Tom qab raug kho nyob rau hauv MoSi2 pas nrig hluav taws xob rauv ntawm 1650 degree × 3h, nws raug txiav raws lub hauv paus dav hlau ntawm lub crucible los ntsuas qhov corrosion thiab nkag mus tob ntawm lub crucible los ntawm slag; Tshuaj tsom xam, kho qhov muag tsom iav, x-Ray diffraction, Cov qauv tom qab slag corrosion raug tshuaj xyuas los ntawm kev sojntsuam hluav taws xob.
Cov txiaj ntsig thiab kev tshuaj xyuas
3.1 Cov khoom thiab cov ntsiab lus cuam tshuam ntawm high-purity aluminium-magnesium castables
High-purity aluminium-magnesium castables yog tsim los ntawm txhuas thiab magnesium castables. Lub hom phiaj yog txhawm rau txhim kho corrosion kuj thiab kub ua haujlwm ntawm aluminium castables, nrog rau txhim kho nws cov permeability tsis kam thiab thermal shock stability. Nws batching point ntog rau ntawm txhuas sab ntawm MgO-Al2O3 binary theem daim duab.
Lub ntsiab tseem ceeb ntawm castable Al2O3 reacts nrog MgO los tsim spinel ntawm qhov kub thiab txias, nrog rau lub ntim expansion ntawm li 7 feem pua. Txhawm rau txhawm rau tshem tawm qhov kev puas tsuaj los ntawm qhov kev ntxhov siab nthuav dav, qhov cuam tshuam ntawm ob yam khoom siv sib txawv, fused magnesia thiab magnesia-alumina spinel, ntawm slag kuj ntawm cov khoom tau kawm xyaum ua. Cov txiaj ntsig tau pom tias thaum muaj qee qhov nyiaj ntawm magnesium ntxiv, cov castable yog lubricated nyob rau hauv ib qho me me ntawm cov kua theem, tshwj xeeb tshaj yog thaum siv, nws raug rau lub siab hydrostatic ntawm molten steel, cov tshuaj tiv thaiv sintering yog siab heev, thiab cov xoob lub cev ntawm spinel expansion yog txhawb kom muaj ntau densified. Magnesia tuaj yeem ua rau cov castable tseem qhia tau tias micro-expansion ntawm qhov kub thiab txias, tswj kev ncaj ncees, thiab tseem muaj txiaj ntsig zoo los txo qis corrosion. Txawm li cas los xij, qhov coarser qhov tseem ceeb ntawm qhov loj me ntawm magnesia, lossis qhov sib ntxiv ntawm ntau tshaj 4C, qhov loj dua qhov nthuav dav, qhov deterioration ntawm cov qauv, qhov sib sib zog nqus ntawm slag nkag mus, thiab qhov nyiam ntawm corrosion poob kom nce.
Cov kev taw qhia ntawm pre-synthetic spinel los hloov fused magnesia, kev tshawb fawb ntseeg hais tias ntau theoretical spinel cov ntsiab lus, qhov zoo dua corrosion kuj ntawm cov castable, thiab slag nkag mus tob yog qhov tsawg tshaj plaws thaum cov ntsiab lus spinel yog 10 feem pua rau 30 feem pua, thiab cov ntsiab lus spinel yog 10 feem pua rau 30 feem pua. Thaum cov ntsiab lus ntau dua 50 feem pua, nws qhia tau hais tias muaj kev nce siab ntxiv nrog qhov nce ntawm cov ntsiab lus spinel. Qhov loj ntawm spinel particle loj nrog kev sib faib ntawm cov hmoov zoo yog qhov zoo tshaj plaws rau kev thaiv cov txheej txheem spalling los ntawm slag infiltration. Txoj kev tshawb nrhiav pom tias cov khoom siv spinel ua lub luag haujlwm txiav txim siab hauv cov slag tsis kam ntawm spinel clinker nws tus kheej thiab cov castable tov nrog corundum, thiab MgO hauv spinel yog qhov zoo tagnrho ntawm 3 feem pua rau 5 feem pua. Lub silica micropowder tseem muaj txiaj ntsig zoo hauv inhibiting qhov tsim ntawm spinel expansion kev nyuaj siab. Cov kev tshawb fawb tau pom tias thaum qhov kub thiab txias, silicon micropowder thiab MgO hmoov daim ntawv MSH cov khoom, uas tuaj yeem tiv thaiv periclase hydration, txhim kho fluidity ntawm castables, thiab nce qhov ceev ntawm castables. Absorb high-temperature expansion stress, txawm li cas los xij, tus nqi ntawm silicon micropowder ntxiv nce, cov kua theem tsim nce ntawm qhov kub thiab txias, thiab qhov kub-kub creep kuj txo. Raws li pom nyob rau hauv daim duab 2, cov khoom yog nquag over-sintering thiab tawg nyob rau hauv lub molten steel siab. nce, tawg dav, thiab spalling deepens. Feem ntau, cov cement thiab silica fume composite binder yog siv.
Tsim nyog tus nqi ntawm siab alumina cement hydrate yog lub cev qhuav dej los ua CA series ntawm cov tshuaj nquag nquag, uas yooj yim rau tshuaj lom neeg nrog cov ntxiv Al2O3 hmoov los ntawm txog 1000 degree.
Hauv kev xaus, ob qho tib si Al-spinel castables thiab Al-Mg castables muaj qhov zoo microstructure uniformity, kub creep tsis kam, thermal shock stability, thiab tsis kam rau slag yaig thiab nkag mus. Qhov sib txawv tseem ceeb ntawm ob yog tias yav dhau los qhia txog kev sib xyaw ua ntej spinel, uas muaj lub zog qis tom qab tua ntawm qhov sib txawv ntawm qhov kub thiab txias, siab kub flexural zog, zoo ntim stability, thiab me me linear hloov tus nqi; tom kawg reacts rau daim ntawv spinel thaum siv kub, thiab sib txawv Nws muaj lub zog siab tom qab hlawv ntawm qhov kub thiab txias, muaj zog creep kuj ntawm qhov kub thiab txias, compactness thiab loj linear hloov tus nqi.
3.2 Kev puas tsuaj ntawm high-purity aluminium-magnesium castables
Aluminium-spinel castable thiab aluminium-magnesium castable yog qhov tseem ceeb ntawm tib lub cev ntawm qhov kub thiab txias, thiab lub ntsiab crystalline theem yog corundum thiab aluminium-nplua nuj spinel. Cov yam ntxwv cuam tshuam rau cov slag kuj ntawm castables yog heev complex, xws li steel qib, slag muaj pes tsawg leeg, smelting tej yam kev mob, thiab lwm yam, tab sis lawv tsuas yog tswj los ntawm cov ntxhia muaj pes tsawg leeg thiab microstructure ntawm castable. Lub FeO thiab MnO ntawm cov txhuas-nplua nuj spinel ntes slag thawj zaug nyob rau hauv cation qhov, thiab hloov ib feem ntawm MgO los ua ib tug composite spinel solid tov nrog ib tug raug muaj pes tsawg leeg ntawm Mg0.70Mn 0.08Fe0.21Al2.00O4. Electron soj ntsuam xyuas qhia tau hais tias nyob rau hauv tib lub cheeb tsam zoo Cov khoom solubility ntawm Fe thiab Mn nyob rau hauv lub spinel ntawm cov hais yog roughly tib yam, thaum cov ntsiab lus ntawm Fe thiab Mn ntsiab nyob rau hauv lub ntug ntawm cov loj spinel hais yog ntau dua li nyob rau hauv. sab hauv ntawm cov khoom. Kev tsom xam kuj qhia tau hais tias lub lattice tas li ntawm spinel maj mam txo los ntawm sab ntawm lub ntsej muag ua hauj lwm mus rau sab hauv, uas yog raws li qhov kev hloov ntawm Fe2O3 cov ntsiab lus nyob rau hauv txhua txheej. Lub zog yog ze rau lub spinel ntawm thawj txheej.
Corundum absorbs CaO hauv slag los tsim calcium aluminate minerals thiab solidifies. Optical microscope soj ntsuam pom tau hais tias muaj cov phaj zoo li calcium aluminate cov tshuaj tiv thaiv lub voj voog ntawm ntug ntawm cov corundum hais nyob rau hauv cov txheej permeable ntawm cov qauv, thiab muaj ntau cov koob zoo li CA6 cov zaub mov hauv matrix. SiO2 txhawb nqa CA6 Thaum cov siv lead ua loj hlob tuaj, cov pores ua kom zoo dua, tsim cov txheej txheem denser, thiab cov slag seem yog nplua nuj nyob rau hauv SiO2 thiab ua nkig thiab nyuaj rau nkag mus.
Qhov sib txawv ntawm aluminium-spinel castable, txawm hais tias aluminium-magnesium castable forms ntau cov kua theem ntawm qhov kub thiab txias, spinel tshiab tsim los ntawm cov tshuaj tiv thaiv ntawm MgO thiab Al2O3 muaj cov nplej zoo, ntau yam tsis xws luag thiab cov lattice me me. Cov spinel tau muab faib ua kom zoo dua qub, uas txhawb nqa cov kev daws teeb meem ntawm Al2O3 rau hauv spinel, tsim ib qho txhuas-nplua nuj spinel nrog rau qhov loj dua ntawm cov lattice defects, thiab cov castable kuj yog denser. Yog li ntawd, cov slag kuj, tshwj xeeb tshaj yog cov tsis kam mus rau slag nkag tau zoo dua. Kev soj ntsuam me me qhia tau hais tias cov khoom sib xyaw spinel hauv cov txheej txheem hloov pauv ntawm cov qauv tau tsim tiav thiab yog euhedral, nrog rau cov nplej loj li ntawm 15-40 hli, thiab qee qhov muaj txog li 120 hli. Cov khoom solubility ntawm FeO thiab MnO nyob rau hauv spinel yog loj heev. Mg0.68Mn0.17Fe0.47Al1.79O4.
Hauv kev xaus
(1) Tsim nyog xaiv ntawm qhov sib tov ntawm spinel, magnesia, silica micropowder thiab cement, thiab kev tswj cov microstructure zoo tagnrho yog qhov tseem ceeb kom tau txais high-purity aluminium-magnesium castables nrog kev ua haujlwm ruaj khov.
(2) Txawm hais tias tus tsim high-purity Al-Mg castables muaj cov khoom sib txawv, lawv txhua tus muaj qhov zoo microstructure uniformity, kub creep tsis kam, thermal shock stability, thiab slag yaig thiab nkag mus.
(3) Anti-slag mechanism ntawm high-purity aluminium-magnesium castables: Spinel captures FeO thiab MnO nyob rau hauv slag los tuav nws cov cation qhov, hloov MgO los ua composite spinel, corundum absorbs CaO los tsim CA2, CA6, SiO6 txhawb CA6 siv lead ua. Cov nplej loj hlob tuaj rau hauv cov txheej txheem denser, thiab cov seem slag yog nplua nuj nyob rau hauv SiO2 thiab thickens, yog li txhim kho cov kev tiv thaiv rau slag nkag mus thiab yaig. Vim yog cov tshuaj tiv thaiv ntawm MgO thiab Al2O3, cov spinel tshiab tsim nyob rau hauv aluminium-magnesium castable muaj cov nplej zoo thiab ntau yam tsis xws luag. Aluminium spinel, yog li ntawd, nws cov slag kuj muaj zog dua li ntawm aluminium-spinel castables.
