1 Kev Taw Qhia
Lub flue ntawm metallurgical rauv nyob rau hauv ib tug steel nroj tsuag tau hloov los ntawm ob-txoj kev mus rau ib-txoj kev, thiab lub flue gas kub nyob rau hauv cov pa pa system (cov lus no yog hais txog lub ascending phab ntsa, txhawb phab ntsa arch, hloov chaw, ntsug flue saum. , thiab lwm yam) nce los ntawm 300-500 degree , uas cuam tshuam rau kev ua haujlwm ntawm lub nraub qaum. Cov txheej txheem ntawm cov tshuaj tsuag dej kom txo tau qhov kub ntawm cov pa roj ua rau muaj dej loj ntawm lub cib hauv cov pa hluav taws xob, thiab thaum lub sij hawm smelting thiab tapping lub sij hawm, qhov kub thiab txias fluctuates heev, ua rau lub cib hauv ob sab phlu tawg thiab poob tiag. , thiab txawm tias sab saum toj ntawm lub ru tsev tawg thiab phab ntsa ntog. Sib tsoo. Vim li no, cov kab cib hauv ob sab phlu siv hauv cov flue yog tsim thiab siv hauv kev xyaum. Cov ntsiab lus yog raws li nram no.
2 Kev ntsuam xyuas
Cov qauv qauv ntawm cov khoom siv zoo tib yam magnesia alumina cib thiab magnesia chrome cib tsim tau teev nyob rau hauv Table 1.
Qhov kev ua tau zoo tseem ceeb ntawm magnesia-chrome cib tsim los ntawm cov txheej txheem tshwj xeeb raws li cov qauv A thiab lawv qhov kev sib piv nrog cov magnesia-alumina cib zoo tib yam tau teev tseg hauv Table 2. Nws tuaj yeem pom tias qhov kub thiab txias load softening kev ua tau zoo ntawm magnesia-chrome. cib tsim los ntawm cov cuab yeej tshwj xeeb tau txhim kho zoo, thiab cov dej tsis zoo thiab thermal poob siab yog ntau dua 3 npaug.
Nws tuaj yeem pom los ntawm daim duab 1 tias qhov seem seem ntawm cov pob zeb magnesia-alumina zoo ib yam yog me me tom qab 1 txog 2 lub cub tawg, thiab siv tsis tau lawm; thaum magnesia-chrome cib tsuas yog nyob rau hauv cov mob hnyav tshaj plaws tom qab siv 2 lub cub tawg, uas yog qhov tsis xws luag ntawm 0-40 hli ntawm qhov sib hloov cib ua haujlwm ntawm qhov qis tshaj plaws hauv qhov dav ntawm 1 m nyob rau hauv nruab nrab ntawm lub koov. ntawm phab ntsa txhawb nqa tseem ua tiav txawm tias tom qab 4-5 rauv. Nws tuaj yeem pom tias qhov kev pabcuam lub neej ntawm magnesia-chrome bricks tseem muaj peev xwm txhim kho.
Obviously, kev siv cov dej tsis zoo thiab thermal shock-resistant magnesia-chrome cib tuaj yeem suav tau raws li tus qauv "tsis xav tau kev kho me me, thiab kev kho rau nruab nrab kho, uas yog, 3 kho nruab nrab (5 furnaces) los tsim. 1 teeb thiab kho ob zaug". Txo tus nqi kho qhov cub qub los ntawm 60 feem pua rau 30 feem pua (4 #, 9 # rauv), txo cov cib siv los ntawm 50 feem pua, thiab txo qhov kho qhov cub ntawm 85.2 feem pua rau 33.3 feem pua (6 #, 7 # rauv), Cov cib noj yog txo los ntawm 60.9 feem pua, thiab qhov nruab nrab cib noj yog txo los ntawm 55.5 feem pua. Tsuas yog txhawb nqa phab ntsa arches thiab thaj chaw hloov pauv tuaj yeem txuag tau ntau lab daus las hauv ib xyoos. Yog tias nws txuas mus rau tag nrho cov pa pa tawm, cov txiaj ntsig tseem ceeb dua. Tam sim no, cov dej tsis zoo thiab thermal shock-resistant magnesia-chrome cib tau nce thiab siv.
3 Microstructure ntawm waterproof thiab thermal shock-resistant magnesia-chrome cib
Tus thawj zoo tib yam magnesia-alumina bricks thiab zoo tib yam burnt magnesia bricks yog tsuas yog puas los ntawm pulverization thiab tev, thiab cov magnesia-chrome bricks yog tsim los ntawm kev tsom mus rau kev txhim kho cov kev ua tau zoo ntawm kub tsis kam, waterproofing thiab thermal shock kuj ntawm cov khoom. Xuab zeb thiab xaiv chrome ore yog cov khoom siv hauv paus, uas yog tsim los ntawm kev sib tsoo thiab kev tshuaj ntsuam, kev sib xyaw ua ke, kev kub siab molding thiab ultra-siab kub sintering. Kev sib piv ntawm nws cov khoom tseem ceeb thiab cov qub magnesia-alumina cib tau teev nyob rau hauv Table 1 thiab Table 2. Nws tuaj yeem pom tau tias qhov kev ua tau zoo ntawm peb lub cib tsim tau pom tseeb zoo dua li cov magnesia-alumina cib, thiab A yog. qhov zoo tshaj plaws.
AHMT{{0}}NU universal professional research microscope thiab BHS-753P advanced polarizing microscope uas tsim los ntawm 0LYMPUS hauv Nyij Pooj tau siv los tshuaj xyuas cov microstructure ntawm zoo tib yam magnesia alumina bricks, zoo tib yam hlawv magnesia cib thiab siab kub resistant, waterproof, thermal shock resistant magnesia chrome cib rau cov pa pa system. Ua kev tshawb fawb soj ntsuam.
(1) Ordinary magnesia-alumina cib: cov khoom hauv cov cib no yog cov magnesia zoo tib yam, lub ntsiab siv lead ua theem ntawm periclase yog me me, thiab feem ntau yog nyob rau hauv cov duab ntawm roe, thiab theem nrab yog silicate feem ntau muaj calcium forsterite theem. ; ib tug kuj tuab thiab nruam silicate theem zaj duab xis nyob ib ncig ntawm lub periclase theem yog lub ntsiab feature ntawm lub zoo tib yam magnesia microstructure. Ntxiv rau theem periclase thiab theem silicate nyob rau hauv qhov zoo tib yam magnesia-alumina cib puag, lub ntsiab siv lead ua theem yog magnesia-alumina spinel; cov magnesia-alumina spinel nyob rau hauv hom no zoo tib yam magnesia-alumina cib yog feem ntau concentrated nyob rau hauv lub zes duab, spinel Ib leeg muaju feem ntau nyob ib ncig ntawm silicate theem, thiab ncaj spinel-periclase bonds yog tsis tshua muaj tsim. Txawm li cas los xij, kev sib raug zoo ntawm cov khoom thiab cov matrix yog qhov ntom ntom.
duab
Daim duab 4 Microstructure ntawm zoo tib yam magnesia-alumina cib
Ordinary calcined magnesia cib: Nws cov ntxhia theem muaj pes tsawg leeg yog zoo ib yam nrog rau ib feem ntawm zoo tib yam magnesia-alumina cib. Nws tuaj yeem pom tau tias zoo tib yam calcined magnesia cib muaj qhov yooj yim microstructure thiab cov qauv compact.
Waterproof thiab thermal shock-resistant magnesia-chrome cib: Lub cib no muaj cov zaub mov ntau dua thiab nplua nuj microstructure. Muaj ob peb theem silicate nyob rau hauv high-zoo magnesia hais, qhov ncaj qha kev sib txuas ntawm cov theem periclase yog siab, thiab kev sib xyaw nrog cov matrix yog ntom; qhov nruab nrab ntawm cov chrome ore uas tau xaiv yog nyob rau sab laug thiab qis nruab nrab] Lub ntsiab siv lead ua theem yog Fe Cr O4, thiab theem nrab siv lead ua yog cov magnesium-muaj silicate theem feem ntau sib cais los ntawm matrix los ntawm microcracks. Qhov dav thiab ncua ntev ntawm microcracks sib txawv raws li qhov loj me. Qhov loj dua qhov particle loj, qhov dav thiab ntev ntawm microcracks, thiab vice versa. Lub purity ntawm cib matrix yog Ameslikas siab, thiab cov ntsiab lus ntawm silicate theem yog tsawg. Ib feem ntawm Fe O thiab Cr2O3 nyob rau hauv chrome ore diffused mus rau hauv lub periclase siv lead ua los txhawb kev loj hlob ntawm periclase siv lead ua, thiab ib co chrome ore reacted nrog magnesia. Cov txiaj ntsig magnesia-chromium spinel muaj nyob nruab nrab ntawm periclase, uas ntxiv txhim kho kev sib txuas ncaj qha ntawm cov theem khoom (periclase-periclase, periclase-spinel, spinel-spinel).
Los ntawm kev sib piv ntawm cov microstructures saum toj no, nws tuaj yeem pom tau tias magnesia-chromium cib tau txhim kho qhov kub thiab txias, tsis muaj dej, thermal shock tsis zoo dua li cov magnesia alumina cib thiab zoo tib yam hlawv magnesia cib. Lub mechanism yog raws li nram no:
(1) Siv cov khoom zoo magnesia thiab xaiv chrome ore ua cov ntaub ntawv hauv paus, kev tsim cov kev kub ntxhov siab thiab kub kub kub, kom qhov sib txuas ncaj qha ntawm cov khoom theem ntawm magnesia-chrome cib ntawm qhov kub thiab txias, nrog txaus high-temperature zog thiab zoo heev ntim stability. thiab kub creep kuj, kom nws los ntawm deformation thiab vau.
(2) Vim tias cov dej tsis kam ntawm periclase, magnesia-aluminium spinel thiab magnesia-chromium spinel nce ntxiv; thiab xaiv chrome ore nyob rau hauv magnesia-chromium cib nws tus kheej kuj yog ib hom spinel, uas reacts nrog magnesia thiab ntxiv Magnesium-chromium spinel yog tsim, yog li cov waterproofing kev ua tau zoo ntawm cov khoom yog txhim kho.
(3) Qhov sib ntxiv ntawm qee tus lej thiab qib ntawm chrome ore particles tsim ib qho tsim nyog ntawm micro-cracks nyob rau hauv cov khoom (ua los ntawm cov thermal expansion coefficients tsis sib haum). Lub hav zoov ntawm micro-cracks tuaj yeem nqus tau lub zog ntawm kev nthuav tawm thiab nthuav tawm cov kab nrib pleb loj, ua rau exfoliation loj. Kev nthuav tawm thiab kev nthuav tawm ntawm cov kab nrib pleb tsis muaj zog thiab raug txiav, yog li txhim kho thermal poob siab.
4 Kev sib piv ntawm kev siv tswv yim
4.1 Ordinary magnesia alumina cib
Kev siv cov pob zeb magnesia-alumina zoo tib yam hauv cov phab ntsa txhawb nqa yog raws li hauv qab no: qhov kev pab cuam lub cub tawg thawj zaug (kho me me) yog kho (qee zaum tag nrho cov hloov), thiab qhov thib ob lub qhov cub (kev kho nruab nrab) yog hloov tag nrho. Piv txwv li, 6 # qhov cub tau kho 9 zaug hauv ib xyoos, tag nrho cov phab ntsa txhawb nqa tau muab tshem tawm thiab hloov 8 zaug, thiab lub hau npog tau kho ib zaug, uas yog, tus nqi tu ntawm qhov no yog 94.4 feem pua. Lub 9 # lub cub tawg tau kho 10 zaug hauv ib xyoos, thiab cov phab ntsa txhawb nqa thiab cov arches tag nrho raug tshem tawm thiab hloov 6 zaug, thiab kev saib xyuas tus nqi yog 60 feem pua. Yog li ntawd, nws yog ib qho tseem ceeb los txhim kho lub neej ntawm lub cib hauv ob sab phlu ntawm cov pa pa system thiab txo cov kev siv ntawm cib.
4.2 Waterproof thiab thermal shock-resistant magnesia-chrome cib
Qhov xwm txheej ntawm cov dej tsis zoo thiab thermal shock-resistant magnesia-chrome cib siv rau kev txhawb nqa phab ntsa arches yog raws li hauv qab no: thawj qhov cub qhov kev pab cuam tsis zoo thiab tsis tas yuav tsum tau them; Vim tias qhov kev soj ntsuam thaum lub sij hawm kho nruab nrab tseem ua tiav heev, tsis tas yuav kho, tab sis vim kev txhawj xeeb tias kev kho nruab nrab yuav tsis kho qhov kev kho me me tom ntej thiab tom qab ntawd kev txhim kho yuav raug cuam tshuam, yog li kev kho yog nqa tawm. nyob rau hauv 1 m nyob rau hauv nruab nrab, thiab thaum kawg 4 mus rau 5 furnaces yuav kho. Nws tuaj yeem hloov tau thaum lub sijhawm ua haujlwm, kom lub neej kev pabcuam tuaj yeem nce 2 mus rau 3 zaug.
5 Kev xaus
Raws li cov khoom siv zoo magnesia thiab xaiv chrome ore, qhov kub thiab txias, tsis muaj dej, thiab thermal-shock-resistant magnesia-chromium bricks tsim los ntawm cov txheej txheem tshwj xeeb hloov cov qub magnesia-alumina cib thiab cov pob zeb hlawv magnesia. Nws qhov zoo yog raws li nram no: yooj yim ntawm-site tsim, zoo masonry kev ncaj ncees, siab txaus lub zog, ntim stability thiab creep kuj, tshwj xeeb tshaj yog zoo heev waterproofing thiab thermal shock resistance; Kev pabcuam lub neej tau nce los ntawm 2 mus rau 3 zaug, kev siv cib txo qis los ntawm 55.5 feem pua, thiab tsuas yog kev txhawb nqa phab ntsa thiab thaj chaw hloov pauv tuaj yeem txuag tau ntau lab yuan txhua xyoo. Cov dej tsis zoo thiab thermal shock-resistant magnesia-chrome bricks yog tam sim no siv.
