Ladle yog ib lub thawv uas tseem ceeb hauv cov txheej txheem steelmaking.
Nrog rau kev txhim kho txuas ntxiv ntawm smelting technology, tshwj xeeb tshaj yog kev kho mob ntawm LF thiab RH sab nraum lub qhov cub, nws lub luag hauj lwm tau tsim los ntawm qhov yooj yim tuav molten hlau mus rau lub cub tawg uas ua haujlwm rau qee yam smelting. Nyob rau lub sij hawm ntev ntawm cov hlau molten nyob rau hauv lub ladle yuav inevitably ua rau poob ntawm molten steel kub, thiab siab thermal conductivity ntawm lub ob sab phlu yuav ua rau kom kub dissipation poob ntawm lub molten hlau, loj deformation ntawm lub ladle plhaub. , thiab nce kub poob tus nqi ntawm cov hlau molten, ua rau loj slag dai rau ntawm phab ntsa ntawm lub ladle. Nodules, txias steel. Tsis tshua muaj kub ntau dhau, txawm tias yuam cov tundish kom tsis txhob muaj qhov kawg ntawm lub ncuav, tsis tsuas yog cuam tshuam rau qhov zoo ntawm cov slab, tab sis kuj txo qis cov txiaj ntsig ntawm cov hlau molten thiab nce cov nqi tsim khoom. Yog li ntawd, lub thermal rwb thaiv tsev ladle tau nce ua qhov kev thov ntawm steel mills. Cov qauv txheej txheem ntawm thermal rwb thaiv tsev ladle refractory feem ntau yog lub teeb rwb thaiv tsev board lossis nano-board ntxiv rau txheej ruaj khov castable ntxiv rau cov txheej txheem ua haujlwm refractory.
Cov thermal rwb thaiv tsev feem ntau nws tus kheej xav tau ib txheej ntawm cov khoom siv refractory los tiv thaiv nws. Cov khoom siv no yuav tsum tiv thaiv cov khoom siv rwb thaiv tsev los ntawm kev kub siab ntau dhau, thiab qhov thib ob, nws yuav tsum tiv thaiv cov khoom siv rwb thaiv tsev los ntawm kev ua haujlwm kub (yog tias nws yuav tsum qis dua 1000 degree), tom qab ntawd lub ladle Cov txheej txheem castables yog cov ntaub ntawv tseem ceeb. Qhov zoo tagnrho cov txheej txheem refractory rau thermal rwb thaiv tsev ladle yuav tsum muaj cov thermal stability, thermal rwb thaiv tsev, corrosion kuj, kev nyab xeeb thiab txhim khu kev qha daim ntawv thov, ua tiav cov qauv thiab kev pab lub neej ntev. Yuav kom tswj tau qhov zoo thermal rwb thaiv tsev ntawm lub ladle thiab txo qhov kub poob ntawm cov hlau molten, qhov kev ntsuam xyuas ntawm CA6 tshiab castable thiab lub teeb mullite castable tau ua nyob rau hauv txoj hauj lwm no, thiab siv rau lub ladle kom ua tau zoo dua. kev thermal rwb thaiv tsev nyhuv.
Tam sim no, cov khoom ntawm cov txheej txheem mus tas li ntawm lub ladle yog feem ntau zoo tib yam high-alumina castable, thiab cov khoom tseem ceeb yog bauxite. Cov teeb meem hauv qab no muaj nyob rau hauv kev siv cov refractory castable no: ua ntej, thermal conductivity siab, uas ua rau lub zog poob thaum siv; Thib ob, lub refractoriness yog tsawg, yog hais tias cov txheej txheem ua hauj lwm yog txawv txav, cov hlau molten ncaj qha mus rau cov txheej txheem mus tas li Thaum, qhov tshwm sim ntawm kev tho thiab cov hlau xau yog siab, thiab qhov kev nyab xeeb yog tsawg; Qhov thib peb, qhov ntom ntom yog loj, thiab qhov hnyav ntawm khoob pw yog loj. Yog li ntawd, cov kev cai tshwj xeeb rau ladle rwb thaiv tsev tsis txaus siab, thiab ib hom tshiab ntawm cov txheej ruaj khov castable nrog cov khoom zoo heev yuav tsum tau tsim. Hauv daim ntawv no, cov qauv kev npaj thiab kev sim ntawm CA6 castable tshiab thiab lub teeb mullite castable tau ua tiav.
1. Cov ntaub ntawv raw thiab cov phiaj xwm kuaj
Ntawm lawv, CA6 raw khoom (CaAl12O19, abbreviated li CA6) yog calcium aluminate theem nrog cov ntsiab lus siab tshaj ntawm Al₂O₃ hauv CaO-Al₂O₃ system. Nws qhov melting point yog 1875 degree, thermal expansion coefficient yog 8. . Lub refractory kev ua tau zoo ntawm cov khoom no zoo ib yam li cov tabular corundum, thiab cov thermal conductivity tsuas yog 1/3 ntawm corundum. Nws yog ib hom tshiab ntawm cov khoom siv thermal rwb thaiv tsev zoo uas tau tshwm sim nyob rau xyoo tas los no. CA6 castable yog ua los ntawm CA6 ua aggregate, thiab cov matrix ib feem yog ua los ntawm tabular corundum nplua hmoov, alumina hmoov thiab calcium aluminate cement li binder. Qhov ntom ntom ntawm spherical lub teeb mullite hais yog 1.59 cmon³, thiab lub porosent porosity yog 38.9 feem pua. Lub teeb mullite castable yog tsim los ntawm microporous M70 spherical lub teeb mullite cov khoom sib sau ua ke, thiab cov khoom siv matrix yog ua los ntawm tabular corundum hmoov zoo, alumina hmoov thiab calcium aluminate cement kom zoo dua tiv thaiv slag yaig los txhim kho kev nyab xeeb ntawm txheej mus tas li.
2. Cov txheej txheem xeem thiab kev xeem ua haujlwm
Kev kuaj lub cev thiab kev ntsuas kev tiv thaiv corrosion tau ua tiav rau ob hom castables tom qab casting. Cov txheej txheem kuaj lub cev yog ua raws li lub teb chaws tus qauv lossis cov qauv kev lag luam.
Material Properties Results thiab Analysis
(1) Lub cev muaj zog
Qhov ntom ntom ntawm lub teeb yuag mullite castable yog 2.17g·cm⁻³, chav tsev qhov hnyav yog 24 feem pua qis dua qhov tam sim no siv high-aluminium castable, thiab thermal conductivity yog txo los ntawm 16 feem pua, uas tuaj yeem ua tiav lub hom phiaj ntawm Lub teeb yuag thiab qis thermal conductivity ntawm lub ladle. CA6 castables kuj yog 5.6 feem pua sib zog thiab 26 feem pua ntawm cov thermal conductivity dua li cov high-aluminium castables.
Kev ntsuas tiv thaiv kev yaig
Tus thawj ladle ruaj khov txheej castable B, tshiab CA6 castable C, thiab lub teeb mullite castable 3# tau nchuav rau hauv crucibles feem. Qhov kawg slag ntawm lub converter tau ntxiv, thiab qhov kev ntsuam xyuas corrosion ntawm lub crucible nyob rau hauv cov xwm txheej ntawm 1500 degree tshav kub preservation rau 3h yog nqa tawm. Saib xyuas lub melting poob thiab nkag mus ntawm cov khoom sib txawv. Tom qab qhov kev xeem tiav, lub crucible yog txiav qhib,
Lub CA6 castable muaj qhov zoo tiv thaiv kev yaig thiab nkag mus, thiab ntau cov slag tseem nyob hauv qhov crucible; lub teeb mullite castable muaj qhov siab tshaj plaws corrosion kuj thiab tiv thaiv kev nkag mus; Lub ciam teb ntawm qhov zoo tib yam high-alumina mus tas li txheej castable slag thiab cov refractory tsis meej, thiab crucible refractory thiab cov refractory tsis meej. Lub slag yog melted ua ke, thiab kev nkag mus kuj yog me ntsis zoo dua li cov erosion kuj, qhia tias muaj ntau theem ua kua nyob rau hauv lub high-alumina castable ntawm 1500 degree, yog li cov khoom yuav tsum tau kho kom zoo dua los txhim kho nws kub tsis kam, uas. yog ib qho tseem ceeb heev rau kev nyab xeeb ntawm lub ladle. Lub microporosity ntawm spherical lub teeb mullite muaj txiaj ntsig zoo rau kev txhim kho corrosion thiab permeability, yog li cov khoom siv lub teeb tuaj yeem pom zoo thermal rwb thaiv tsev thiab corrosion kuj.
Daim ntawv thov
Cov saum toj no peb hom castables yog siv rau ntawm 300t ladle. Lub teeb mullite castables thiab CA6 castables rau txheej ruaj khov ntawm cov thermal rwb thaiv tsev ladle yuav tsum muaj ob qho tib si zoo tiv thaiv molten hlau yaig thiab thermal rwb thaiv tsev, thiab tib lub sij hawm, cov txheej txheem kev ncaj ncees ntawm cov txheej txheem kev pab cuam lub cub tawg yog qhov zoo, thiab thermal rwb thaiv tsev nyhuv yog ruaj khov.
Kev siv thev naus laus zis ntawm yuav ua li cas txo qhov tawg ntawm cov khoom siv tas mus li ntawm thermal rwb thaiv tsev ladle tseem yuav tsum tau kawm ntxiv.
Los ntawm qhov nruab nrab kub ntawm txhua kab slag nyob rau hauv txhua lub ladle, lub plhaub steel ntawm lub uninsulated ladle slag kab yog siab tshaj 320 degree, thaum qhov nruab nrab kub ntawm 4 thermally insulated slag kab yog qis dua 280 degree. Feem ntau, qhov kub ntawm slag kab steel plhaub txo qis. 50-100 degree. Qhov kub poob ntawm lub plhaub steel ntawm qhov cladding yog nruab nrab ntawm 20 thiab 50 degree, uas yog txawv me ntsis nyob ntawm seb qhov kev teeb tsa ntawm cov khoom siv thermal rwb thaiv tsev thiab cov khoom siv txheej ruaj khov. Cov khoom siv thermal rwb thaiv tsev ntawm lub hnab thermal rwb thaiv tsev kuaj lub hnab tseem nyob hauv qhov zoo thaum lub sijhawm ua haujlwm ntawm lub cub tawg, thiab qhov nruab nrab kub ntawm cov kab slag thiab cladding steel plhaub yog qis dua li ntawm cov ladle qub, qhia tias cov txheej txheem mus tas li ua si zoo. tiv thaiv lub luag haujlwm. Txhawm rau kom muaj kev nyab xeeb, qhov xwm txheej tam sim no qhov tawg ntawm cov khoom siv ruaj khov tshiab tau pom tseeb dua tom qab 2 lub cub tawg tseem yuav tsum tau ua kom zoo dua qub thiab txhim kho kom ntseeg tau tias nws tuaj yeem siv rau 4 lub qhov cub.
nyob rau hauv xaus
Lub thermal rwb thaiv tsev ladle tau dhau los ua ib qho kev ntsuas tseem ceeb rau cov tuam txhab hlau thiab hlau kom txuag tau lub zog thiab tiv thaiv ib puag ncig thiab txhim kho cov khoom siv hlau zoo. Cov khoom siv ntawm cov txheej txheem mus tas li ntawm lub ladle yog muab cov kev xav tau ntau dua. Lub cev lub cev ntawm cov tsim CA6 castable thiab lub teeb mullite castable ua tau raws li daim ntawv thov ntawm cov txheej txheem mus tas li ntawm lub ladle, thiab tib lub sij hawm muaj thermal rwb thaiv tsev zoo dua thiab corrosion tsis kam tshaj li cov pa high-alumina castable, uas tuaj yeem tiv thaiv thermal rwb thaiv tsev. khoom. Lub luag haujlwm ntawm lub ladle kom tswj tau zoo thermal rwb thaiv tsev thaum lub sijhawm ua haujlwm ntawm lub cub tawg. Kev tshawb fawb ntxiv rau qhov tob yog xav tau ntawm kev siv thev naus laus zis los txo qhov tawg ntawm cov khoom siv ruaj khov ntawm cov thermal rwb thaiv tsev ladle.
