High alumina cibxa mus rau sintered cov khoom uas muaj ntau tshaj 48% ntawm Al2O3, alumina silicate los yog ntshiab alumina. Feem ntau, high-alumina cib muaj tsawg dua 80% ntawm Al2O3, thiab cov uas muaj ntau tshaj 80% ntawm Al2O3 hu ua corundum bricks.
Piv nrog av nplaum cib, high-alumina cib muaj qhov zoo tshaj plaws ntawm qhov siab refractoriness thiab siab load softening kub. Nyob rau hauv kev siv ntawm industrial kilns, muaj tsib hom ntawm high-alumina cib.
(1) Ordinary siab aluminium cib
Ordinary siab aluminium bricks tau dhau los ua cov khoom siv hauv ntau lub thermal kilns vim lawv qhov tshwj xeeb muaj pes tsawg leeg thiab kev ua tau zoo heev. Nws cov ntxhia muaj pes tsawg leeg feem ntau suav nrog mullite, corundum thiab iav theem. Qhov piv thiab cov ntsiab lus ntawm peb qhov ncaj qha txiav txim siab tag nrho kev ua tau zoo ntawm high-alumina bricks.
Nrog rau qhov maj mam nce ntawm cov ntsiab lus ntawm alumina (Al2O3), cov ntsiab lus ntawm mullite thiab corundum kuj qhia tau hais tias kev loj hlob zoo sib xws, thaum cov ntsiab lus ntawm iav theem maj mam txo qis. Qhov kev hloov no tsis tsuas yog txhim kho cov refractoriness ntawm high-alumina bricks, tab sis kuj ua rau lawv cov kev ua tau zoo nyob rau hauv high-temperature ib puag ncig ruaj khov thiab zoo heev.
Piv nrog rau cov khoom siv av nplaum, zoo tib yam high-alumina bricks qhia tau zoo heev refractory kev ua tau zoo. Qhov no tsis yog tsuas yog xav txog hauv lawv cov refractoriness ntau dua, tab sis kuj nyob rau hauv lawv lub peev xwm los tuav lub xeev ruaj khov ntev dua thaum siv, yog li ua kom muaj txiaj ntsig zoo rau kev pab cuam lub neej ntawm lub kiln. Qhov kom zoo dua no tau coj mus rau kev siv dav ntawm high-alumina cib hauv ntau lub thermal kilns. Txawm hais tias nws yog metallurgy, iav, ceramics lossis lwm yam kev lag luam uas xav tau kev kho cua sov, high-alumina bricks tau txais kev lag luam lees paub rau lawv cov kev ua tau zoo.
(2) High-load mos siab alumina cib
High-load mos high-alumina bricks sawv tawm rau lawv cov kev ua tau zoo thiab tau dhau los ua cov khoom siv rau ntau qhov chaw kub kub. Piv nrog rau cov high-alumina bricks zoo tib yam, high-load mos high-alumina cib tau dhau los ua qhov zoo tshaj plaws thiab kev txhim kho hauv matrix thiab binder qhov chaw, yog li ua tiav kev txhim kho tseem ceeb.
Nyob rau hauv matrix ib feem, high-load mos high-alumina bricks tsis tsuas yog ntxiv precious tri-pob zeb mloog zoo, tab sis kuj cleverly qhia high-alumina cov ntaub ntawv xws li corundum hmoov thiab high-aluminium corundum hmoov raws li theoretical muaj pes tsawg leeg ntawm cov tshuaj muaj pes tsawg leeg tom qab. hlawv ze rau mullite. Qhov sib ntxiv ntawm cov khoom siv high-alumina no tsis tsuas yog txhim kho cov qauv kev ruaj ntseg ntawm lub cev cib, tab sis kuj tseem txhim kho nws cov kev ua tau zoo dua.
Nyob rau hauv cov nqe lus ntawm kev xaiv ntawm binders, high-load mos high-alumina cib kuj tau ua zoo rau kev siv zog. Nws siv cov av nplaum zoo zoo ua cov ntawv khi, thiab hloov tau yooj yim xaiv cov av nplaum sib txawv los yog mullite binders raws li ntau yam thiab xav tau. Qhov no refined xaiv thiab tsim enables high-load mos high-alumina cib los tsim ib tug nruj thiab muaj zog qauv thaum lub sij hawm firing txheej txheem, yog li ntxiv txhim kho nws load softening kub.
(3) Tsawg creep siab alumina cib
Txhawm rau txhim kho qhov nkag siab tsis kam ntawm high-alumina cib, peb tau txais cov tswv yim ntawm kev tsis sib haum xeeb. Lub hauv paus ntawm lub tswv yim no yog ua tib zoo xaiv thiab ntxiv cov khoom siv zoo xws li cov pob zeb tri-pob zeb thiab activated alumina raws li qhov tseeb kev ua haujlwm kub ntawm lub kiln, kom cov muaj pes tsawg leeg ntawm matrix yog ze los yog tag nrho. mus txog qhov muaj pes tsawg leeg ntawm mullite li sai tau. Qhov no yog vim hais tias mullite, raws li ib tug high-kev ua tau zoo refractory ntxhia, muaj zoo heev mechanical thiab thermal zog, uas muaj peev xwm ho txhim kho tag nrho cov high-temperature kev ua tau zoo ntawm cov khoom.
Nyob rau hauv tus txheej txheem ntawm kev ua kom tiav mullite tsim ntawm lub matrix, peb nruj me ntsis tswj qhov piv ntawm alumina (Al₂O₃) rau silica (SiO₂), uas yog tus yuam sij kom ntseeg tau tias ua tiav mullite tsim ntawm lub matrix. Los ntawm cov kev cai zoo no, peb tau ua tiav txo cov ntsiab lus ntawm cov iav theem thiab ntxiv txhim kho cov creep kuj ntawm cov khoom.
(4) Phosphate-bonded high-alumina cib
Phosphate-bonded high-alumina cib ua si lub luag haujlwm tsis tuaj yeem hloov pauv hauv ntau qhov chaw ua haujlwm kub kub nrog lawv cov txheej txheem kev npaj tshwj xeeb thiab kev ua haujlwm zoo. Cov khoom no siv cov khoom lag luam zoo, ntom ntom tshwj xeeb lossis thawj qib high-alumina bauxite clinker ua cov khoom siv tseem ceeb, siv cov tshuaj phosphate lossis aluminium phosphate tov ua cov ntawv khi, thiab siv cov txheej txheem semi-qhuav tshuab nias, thiab tom qab ntawd ua tiav qhov tseeb. Kev kho cua sov ntawm 400 mus rau 600 degree, thaum kawg tsim cov khoom siv tshuaj lom neeg ua haujlwm siab refractory.
Nws yog ib nqi sau cia hais tias phosphate-bonded high-alumina bricks yog nyob rau hauv qeb ntawm unfired cib. Txhawm rau kom tsis txhob muaj qhov shrinkage ntawm cov khoom uas yuav tshwm sim thaum siv, peb ua tib zoo qhia cov khoom siv hluav taws xob nthuav dav xws li kyanite thiab silica rau hauv peb cov khoom xyaw. Qhov sib ntxiv ntawm cov khoom siv raw no tsis yog tsuas yog txo qhov kev poob qis ntawm cov khoom, tab sis kuj tseem txhim kho lawv cov kev ruaj ntseg tag nrho.
Piv nrog cov ceramic-bonded raug rho tawm haujlwm siab-alumina cib, phosphate-bonded siab aluminium cib qhia pom tseeb qhov zoo hauv kev ua haujlwm tiv thaiv. Txawm li cas los xij, tseem muaj chaw rau kev txhim kho nyob rau hauv cov nqe lus ntawm load softening kub thiab yaig kuj. Txhawm rau ua kom qhov tsis txaus no, peb ua tib zoo ntxiv me me ntawm cov khoom zoo xws li fused corundum thiab mullite thaum lub sijhawm npaj. Qhov sib ntxiv ntawm cov ntaub ntawv no tsis tsuas yog ua kom muaj zog ntawm matrix, tab sis kuj tseem txhim kho qhov kub thiab txias tsis kam ntawm cov khoom.
(5) Micro-expanding high-alumina cib
Micro-expanding high-alumina bricks yog tsim los ntawm high-quality high-alumina bauxite raws li cov ntaub ntawv tseem ceeb, thiab cleverly ntxiv nrog xaiv peb-pob zeb concentrates. Lawv ua tib zoo crafted los ntawm nruj me ntsis raws li cov txheej txheem ntawm high-alumina cib.
Txhawm rau ua kom muaj lub siab alumina cib kom nthuav dav kom tsim nyog thaum siv, peb them nyiaj tshwj xeeb rau kev xaiv ntawm peb lub pob zeb concentrates thiab kev tswj hwm ntawm lawv qhov loj me. Los ntawm kev ua tib zoo xaiv qhov tsim nyog tri-stone concentrates thiab nruj me ntsis tswj qhov kub thiab txias, peb tau ua tiav qee qhov kev xaiv tri-stone minerals kom undergo mullitization cov tshuaj tiv thaiv, thaum khaws qee yam tsis muaj kev cuam tshuam tri-stone minerals. Cov pob zeb uas nyob hauv cov pob zeb no yuav ua rau cov tshuaj tiv thaiv ntau ntxiv (piv txwv li thawj lossis theem nrab mullitization) thaum siv, nrog rau qhov ntim nthuav dav, yog li muab cov alumina cib siab tshwj xeeb micro-expansion zog.
Micro-expansion high-alumina bricks ua lub luag haujlwm tsis tuaj yeem hloov pauv hauv ntau qhov kub kub ntawm cov khoom siv hluav taws xob vim lawv qhov tshwj xeeb micro-expansion zog thiab zoo heev tiv thaiv slag nkag. Txawm hais tias nws yog metallurgy, iav, ceramics lossis lwm yam lag luam uas xav tau kev kho mob kub, micro-expansion high-alumina bricks tuaj yeem muab cov khoom lav rau kev tsim cov lag luam nrog lawv cov kev ua tau zoo thiab ruaj khov zoo.
