Daim ntawv thov ntawm Fused Corundum Cib hauv Float Glass Melting Rauv

Fused corundum bricksyog melted alumina nyob rau hauv ib tug hluav taws xob arc rauv thiab cam khwb cia rau hauv ib tug tshwj xeeb qauv ntawm ib tug tshwj xeeb zoo, annealed thiab tshav kub-preserved, thiab ces ua tiav kom tau cov khoom xav tau. Cov txheej txheem ntau lawm yog siv high-purity calcined alumina (tshaj 95%) thiab me me ntawm additives, muab cov khoom xyaw rau hauv hluav taws xob arc rauv, thiab cam khwb cia rau hauv prefabricated pwm tom qab melted ntawm kub siab tshaj 2300 ° C. , thiab tom qab ntawd ua kom lawv sov Tom qab annealing, nws raug tshem tawm, thiab cov khoom siv tawm los ua cov khoom tiav uas ua tau raws li qhov yuav tsum tau ua tom qab kev ua haujlwm txias, ua ntej sib dhos thiab tshuaj xyuas.

Fused corundum bricks tau muab faib ua peb hom raws li qhov sib txawv siv lead ua cov ntaub ntawv thiab ntau ntawm alumina: thawj yog α-Al2O3 raws li lub ntsiab siv lead ua theem, hu ua α-corundum cib; qhov thib ob yog α-Al2 Lub O 3 thiab β-Al2O3 siv lead ua theem feem ntau yog nyob rau hauv tib cov ntsiab lus, uas yog hu ua αβ corundum cib; hom thib peb feem ntau yog β-Al2O3 siv lead ua theem, hu ua β corundum cib. Fused corundum bricks feem ntau siv nyob rau hauv ntab iav melting rauv yog hom thib ob thiab thib peb, uas yog fused αβ corundum cib thiab β corundum cib. Kab lus no yuav tsom mus rau lub cev thiab tshuaj lom neeg ntawm fused αβ corundum cib thiab β corundum cib thiab lawv daim ntawv thov hauv ntab iav melting furnaces.

1. Kev soj ntsuam kev ua haujlwm ntawm fused corundum cib

1. 1 Fused αβ corundum cib

Fused αβ corundum cib yog tsim los ntawm 50% α-Al2 O 3 thiab β-Al 2 O 3, thiab ob lub crystals yog interlaced los tsim ib tug heev ntom qauv, uas muaj zoo heev muaj zog alkali corrosion kuj. Kev tiv thaiv corrosion ntawm qhov kub siab (siab tshaj 1350 ° C) yog me ntsis phem dua li cov fused AZS cib, tab sis ntawm qhov kub thiab txias hauv qab 1350 ° C, nws cov corrosion kuj rau molten iav yog sib npaug rau cov fused AZS cib. Vim nws tsis muaj Fe2 O 3, TiO 2 thiab lwm yam impurities, lub matrix iav theem yog me me, thiab txawv teb chaws teeb meem xws li npuas yog tsis tshua muaj tshwm sim thaum nws tiv nrog molten iav, kom lub matrix iav yuav tsis polluted. .

Fused αβ corundum cib yog ntom hauv crystallization thiab muaj kev tiv thaiv zoo heev rau molten iav hauv qab 1350 ° C, yog li lawv tau siv dav hauv cov pas dej ua haujlwm thiab dhau ntawm cov iav melting rauv, feem ntau hauv cov ntxhua khaub ncaws, di ncauj cib, rooj vag cib, thiab lwm yam. Fused corundum bricks nyob rau hauv lub ntiaj teb no yog qhov zoo tshaj plaws ua los ntawm Nyiv lub Toshiba.

1.2 Fused β corundum cib

Fused β-corundum cib yog tsim los ntawm ze li ntawm 100% β-Al2 O 3, thiab muaj cov phaj loj zoo li β-Al 2 O 3 crystalline qauv. Loj dua thiab tsis muaj zog. Tab sis ntawm qhov tod tes, nws muaj qhov zoo spalling kuj, tshwj xeeb tshaj yog nws qhia tau hais tias tsis tshua muaj siab corrosion kuj muaj zog alkali vapor, yog li nws yog siv nyob rau hauv sab sauv qauv ntawm iav melting rauv. Txawm li cas los xij, thaum nws yog cua sov hauv ib qho chaw uas muaj cov ntsiab lus alkali qis, nws yuav hnov ​​​​mob nrog SiO 2, thiab β-Al 2 O 3 yuav yooj yim decompose thiab ua rau lub ntim shrinkage ua rau tawg thiab tawg, yog li nws yog siv nyob rau hauv qhov chaw deb ntawm. kev tawg ntawm iav raw cov ntaub ntawv.

1.3 Lub cev thiab tshuaj muaj zog ntawm fused αβ thiab β corundum cib

Cov tshuaj muaj pes tsawg leeg ntawm fused α-β thiab β corundum cib yog feem ntau Al 2 O 3, qhov sib txawv tsuas yog nyob rau hauv cov siv lead ua theem muaj pes tsawg leeg, thiab qhov sib txawv ntawm microstructure ua rau qhov sib txawv ntawm lub cev thiab tshuaj lom neeg xws li bulk ntom, thermal expansion. coefficient, thiab compressive zog.

2. Daim ntawv thov ntawm fused corundum cib hauv iav melting rauv

Ob qho tib si hauv qab thiab phab ntsa ntawm lub pas dej yog nyob rau hauv kev sib cuag nrog cov iav kua. Rau txhua qhov chaw ncaj qha hu rau cov kua iav, cov cuab yeej tseem ceeb tshaj plaws ntawm cov khoom siv refractory yog cov tshuaj tiv thaiv corrosion, uas yog, tsis muaj tshuaj lom neeg tshwm sim ntawm cov khoom siv refractory thiab iav kua.

Nyob rau hauv xyoo tas los no, thaum ntsuas qhov ntsuas qhov zoo ntawm fused refractory cov ntaub ntawv nyob rau hauv kev sib cuag ncaj qha nrog molten iav, ntxiv rau cov tshuaj muaj pes tsawg leeg, lub cev thiab tshuaj ntsuas, thiab ntxhia muaj pes tsawg leeg, cov nram qab no peb qhia yuav tsum tau soj ntsuam: iav yaig kuj index, precipitated. npuas index thiab precipitated crystallization index.

Nrog rau cov kev xav tau siab dua rau cov iav zoo thiab qhov ntau dua qhov muaj peev xwm ntawm lub cub tawg, kev siv cov fused fais fab cib yuav dav dua. Fused cib feem ntau siv hauv cov iav melting rauv yog AZS series (Al 2 O 3 -ZrO 2 -SiO 2 ) fused cib. Thaum qhov kub ntawm AZS cib siab tshaj 1350 ℃, nws cov corrosion kuj yog 2 ~ 5 npaug ntawm α β -Al 2 O 3 cib. Fused αβ corundum cib yog tsim los ntawm cov staggered α-alumina (53%) thiab β-alumina (45%) cov khoom zoo, uas muaj me me ntawm iav theem (kwv yees li 2%), sau lub qhov hws ntawm cov muaju, nrog purity siab, thiab tuaj yeem siv los ua cua txias hauv pas dej ua ke phab ntsa cib thiab cua txias qhov hauv qab pavement Cib thiab seam bricks thiab lwm yam.

Cov ntxhia muaj pes tsawg leeg ntawm fused αβ corundum cib tsuas yog muaj me me ntawm cov iav theem, uas yuav tsis nkag mus thiab ua paug cov iav kua thaum siv, thiab muaj corrosion kuj zoo thiab zoo heev kub-kub hnav tsis kam hauv qab 1350 ° C. txias ib feem ntawm lub khob melting rauv. Nws yog cov khoom siv zoo tshaj plaws rau cov phab ntsa tank, tank hauv qab thiab ntxhua khaub ncaws ntawm ntab iav melting furnaces. Nyob rau hauv qhov project ntab iav melting rauv engineering, fused αβ corundum cib yog siv los ua lub pas dej ua ke phab ntsa cib ntawm qhov cua txias ntawm cov iav melting rauv. Tsis tas li ntawd, fused αβ corundum bricks kuj siv rau pavement cib thiab npog sib koom ua ke cib nyob rau hauv qhov chaw txias.

Fused β corundum cib yog cov khoom siv dawb tsim los ntawm β -Al2 O 3 coarse crystals, muaj 92% ~ 95% Al 2 O 3, tsuas yog tsawg dua 1% iav theem, thiab nws cov qauv muaj zog kuj tsis muaj zog vim yog cov iav siv lead ua xoob. . Tsawg, qhov pom tseeb porosity tsawg dua 15%. Txij li Al2O3 nws tus kheej yog saturated nrog sodium saum toj 2000 ° C, nws ruaj khov heev tiv thaiv alkali vapor ntawm qhov kub thiab txias, thiab nws thermal stability kuj zoo heev. Txawm li cas los xij, thaum nyob rau hauv kev sib cuag nrog SiO 2 , Na 2 O muaj nyob rau hauv β-Al 2 O 3 decomposes thiab reacts nrog SiO2 , thiab β-Al 2 O 3 yog yooj yim hloov mus rau hauv α-Al 2 O 3 , ua rau lub ntim loj. shrinkage, ua rau tawg thiab puas. Yog li ntawd, nws tsuas yog tsim nyog rau superstructures nyob deb ntawm SiO2 ya plua plav, xws li lub superstructure ntawm lub pas dej ua haujlwm ntawm lub khob melting rauv, lub spout nyob rau tom qab ntawm lub melting cheeb tsam thiab nws nyob ze parapet, me me rauv leveling thiab lwm yam.

Vim tias nws tsis hnov ​​​​mob nrog alkali hlau oxides volatile, yuav tsis muaj cov khoom molten oozing los ntawm cib nto kom paug cov iav. Nyob rau hauv lub ntab iav melting rauv, vim qhov nqaim ntawm qhov nkag ntawm qhov ntws channel ntawm qhov cua txias, nws yog ib qho yooj yim los ua kom cov evaporation ntawm alkaline vapor ntawm no, yog li cov dej ntws ntawm no yog ua los ntawm fused β bricks uas tiv taus. rau corrosion los ntawm alkaline chav.

3. Cov lus xaus

Raws li cov khoom zoo ntawm fused corundum bricks nyob rau hauv cov nqe lus ntawm iav yaig kuj, ua npuas ncauj kuj, thiab pob zeb kuj, tshwj xeeb tshaj yog nws cov cim siv lead ua qauv, nws hardly pollutes molten iav. Muaj cov ntawv thov tseem ceeb hauv kev nthuav qhia txoj siv, qhov txias txias, khiav, qhov cub me me thiab lwm qhov chaw.