Lub luag haujlwm tseem ceeb ntawm MAGNESIUM-CALCIUM REFRACTORY raw cov ntaub ntawv thiab cov khoom ntxiv rau kev ua haujlwm ntawm cov khoom

Magnesium-calcium-based refractories muaj cov khoom zoo heev, tshwj xeeb tshaj yog kev ua haujlwm ntawm purifying molten steel. Tam sim no, magnesia-calcium refractories yog tsuas yog siv rau nruam casting tundish hauv ob sab phlu, tawm ntawm lub cub tawg refining ladle AOD, VOD rauv, hluav taws xob rauv, converter thiab firing cheeb tsam ntawm loj qhuav txheej txheem cement kiln, thiab lwm yam nyob rau hauv lub neej yav tom ntej, qhov no. hom khoom siv yuav muaj ntau yam kev siv. thov kev cia siab. Magnesium-calcium xuab zeb yog cov khoom siv tseem ceeb rau kev tsim cov magnesium-calcium refractories, thiab nws cov khoom ncaj qha cuam tshuam rau kev siv cov khoom. Yog li ntawd, cov teebmeem ntawm cov ntsiab lus sib txawv ntawm dolomite ultrafine hmoov thiab sib txawv firing kub ntawm microstructure ntawm magnesia-calcium xuab zeb tau kawm. High-zoo magnesium-calcium refractories nrog tsawg thermal conductivity, zoo mechanical zog thiab corrosion kuj ua lub luag haujlwm tseem ceeb.
1 kev sim
1.1 Cov ntaub ntawv raw thiab cov phiaj xwm sim
Hauv qhov kev sim no, maj mam hlawv dolomite hmoov tau siv los ua cov khoom siv tseem ceeb, thiab cov ntsiab lus sib txawv ntawm dolomite ultrafine hmoov tau ntxiv, thiab cov tshuaj muaj pes tsawg leeg ntawm cov khoom siv raw thiab cov khoom ntxiv tau txiav txim siab los ntawm X-ray fluorescence analyzer.
Lub teeb av calcined hmoov tau dhau los ntawm 180-mesh sieve, thiab lub teeb calcined hmoov tsis muaj tshuaj ntxiv tau siv los ua cov qauv dawb paug, thiab tom qab ntawd cov hmoov dolomite ultrafine nrog qhov loj me ntawm li 300-500 nm yog pob-milled los ntawm lub pob zeb rau 48 teev ntawm 3 feem pua. , 6 feem pua ​​​​thiab 9 feem pua ​​​​ntawm cov nyiaj ntxiv (w) tau ntxiv rau cov hmoov uas tau hlawv.
1.2 Cov txheej txheem xeem thiab kev xeem ua haujlwm
Cov khoom xyaw sib xyaw ua ke raws li txoj kev sim, thiab cov khoom sib xyaw yog muab tso rau hauv cov pwm pwm raws li, thiab cov txheej txheem ziab qhuav tau txais yuav. mm thiab ib qho cylindrical qauv nrog qhov siab ntawm 10 mm. Kos tus lej cim, muab tso rau hauv qhov cub kom qhuav thiab qhuav ntawm 95 degree rau 24 teev. Cov qauv qhuav tau calcined nyob rau hauv lub qhov cub kub kub, khaws cia ntawm 1500 thiab 1600 degree rau 2 h, thiab txias rau chav tsev kub ib txwm muaj. Zeiss-ΣIGMA HD field emission scanning electron microscope uas tsim los ntawm Zeiss Tuam Txhab hauv Tebchaws Yelemees tau siv los soj ntsuam cov qauv microstructure thiab morphology, thiab Nano Measurer software tau siv los txheeb xyuas qhov pore loj ntawm cov duab hluav taws xob microscope tom qab tua ntawm 1600 degree.
2 Cov txiaj ntsig thiab kev sib tham
Nws tuaj yeem pom los ntawm 500 lub sij hawm electron microscope duab ntawm cov qauv uas tsis muaj tshuaj ntxiv kho ntawm 1500 thiab 1600 degree tias nrog qhov nce ntawm calcination kub, porosity ntawm magnesia-calcium xuab zeb tsis hloov ntau, thiab nws tuaj yeem pom tias qhov kub thiab txias. tsis muaj kev cuam tshuam rau cov qauv ntawm magnesia-calcium xuab zeb. cuam ​​tshuam loj.
Nws tuaj yeem pom los ntawm 500x electron microscope duab ntawm cov qauv uas cov tshuaj ntxiv yog dolomite superfine hmoov thiab nws cov ntsiab lus (w) yog 3 feem pua, 6 feem pua, thiab 9 feem pua ​​​​ntawm 1500 degree, qhov sib ntxiv ntawm superfine dolomite hmoov zoo yog siab dua. uas tsis muaj qhov sib ntxiv ntawm superfine dolomite hmoov. Kev faib tawm ntawm dolomite hmoov zoo dua qub, qhov pom meej porosity yog nce, thiab cov nyhuv yog qhov zoo tshaj plaws thaum 6 feem pua ​​(w) ntawm ultra-fine dolomite ntxiv. Cov duab tau ua tiav nrog Nano Measurer software, thiab cov kab uas hla hauv lub tshuab ntsuas hluav taws xob tuaj yeem txheeb xyuas kom tau txais cov histogram (saib daim duab 2). Nws tuaj yeem pom los ntawm histogram: thaum cov ntsiab lus dolomite yog 3 feem pua ​​(w), txog 88.53 feem pua ​​​​ntawm cov pores muaj lub pore txoj kab uas hla ntawm 1 mus rau 6 μm, thiab cov pore diameters ntxiv yog tag nrho 6 mus rau 11 μm; thaum cov ntsiab lus dolomite yog 6 feem pua ​​(w), kwv yees li 86.37 μm feem pua ​​​​ntawm cov pores yog concentrated hauv 1-3.8 μm, txog 12.13 feem pua ​​​​ntawm cov pores nyob hauv 3.{{23 }}.9 μm, thiab 1.52 feem pua ​​​​ntawm cov pores nyob hauv 7. 3-9 μm; thaum cov ntsiab lus dolomite yog 9 feem pua ​​(w), txog 82.35 feem pua ​​​​Lub pore txoj kab uas hla ntawm 1-8.2μm, txog 17.64 feem pua ​​​​ntawm cov pore txoj kab uas hla yog 8.2-13μm. Thaum cov ntsiab lus ntawm dolomite ultrafine hmoov yog 6 feem pua ​​(w), tus naj npawb ntawm qhov pores yog qhov loj tshaj plaws, thiab piv nrog 3 feem pua ​​​​thiab 9 feem pua ​​(w), lub sijhawm no, cov pores me dua thiab kev faib tawm ntau dua.
Los ntawm 500-fold SEM duab ntawm cov qauv nrog dolomite ultrafine hmoov cov ntsiab lus (w) ntawm 3 feem pua, 6 feem pua, thiab 9 feem pua ​​​​ntawm 1600 degree, cov duab tau ua tiav nrog NanoMeasurer software, thiab lub pore txoj kab uas hla ntawm lub pores hauv SEM cov duab tuaj yeem txheeb xyuas, thiab tau txais cov duab columnar. duab. Nws tuaj yeem pom los ntawm histogram: thaum cov ntsiab lus dolomite yog 3 feem pua ​​(w), txog 84.78 feem pua ​​​​ntawm cov pores yog 1-5.8 μm inch, thiab cov pores seem yog 5.8-17 μm ; Thaum cov ntsiab lus dolomite yog 6 feem pua ​​(w), kwv yees li 82.61 feem pua ​​​​ntawm cov pores yog concentrated hauv 1-6 μm, txog 13.05 feem pua ​​​​ntawm cov pores nyob hauv 6-11 μm, thiab 1.45 feem pua ​​ntawm cov pores nyob rau hauv qhov ntau ntawm 23. Nws yog ntau concentrated; thaum cov ntsiab lus ntawm dolomite yog 9 feem pua ​​(w), kwv yees li 87.18 feem pua ​​​​ntawm cov pores muaj qhov pore txoj kab uas hla ntawm 1-9 μm, thiab txog 12.81 feem pua ​​​​ntawm cov pores yog 9-17 μm inch.
Nws tuaj yeem pom los ntawm kev txheeb xyuas saum toj no tias cov pores nyob rau hauv magnesia-calcium xuab zeb sintered nrog dolomite ultrafine hmoov yog feem ntau ncig pores, lub pores yog me me nyob rau hauv txoj kab uas hla, uniform nyob rau hauv tis, thiab feem ntau nyob rau hauv lub siv lead ua; Qib micropowder muaj thaj chaw loj tshwj xeeb thiab kev ua haujlwm siab, uas tuaj yeem txhawb nqa sintering. Thaum sintering kub yog 1500 thiab 1600 degree, qhov sib ntxiv ntawm dolomite ultrafine hmoov yog 6 feem pua ​​(w), uas yog tsim nyog. Piv nrog rau cov ntsiab lus ntawm 3 feem pua ​​​​thiab 9 feem pua ​​​​(w), lub pore txoj kab uas hla yog me dua thiab qhov kev faib tawm yog ntau dua. , nws tuaj yeem pom tias qhov kub thiab txias tsis muaj qhov cuam tshuam rau nws.
3 Kev xaus
Lub teeb hluav taws xob dolomite hmoov hauv cheeb tsam Dashiqiao tau siv los ua cov khoom siv raw matrix, thiab cov hmoov superfine dolomite tau siv los ua cov khoom ntxiv. Tom qab cov ntsiav tshuaj thiab molding, nws tau calcined ntawm qhov kub ntawm 1500 thiab 1600 degree, thiab nws microstructure tau soj ntsuam los ntawm scanning electron microscopy. Cov nyhuv ntawm superfine hmoov cov ntsiab lus ntawm microstructure ntawm magnesia-calcium xuab zeb. Thaum qhov sib ntxiv ntawm dolomite superfine hmoov yog 6 feem pua, tus naj npawb ntawm qhov pores loj, qhov pore txoj kab uas hla ntawm qhov pores yog me me, thiab kev faib tawm kuj zoo ib yam.