High alumina cibtuaj yeem hais tias yog ib qho ntawm feem ntau siv cov cib refractory hauv kev lag luam refractory. Muaj ntau pua qhov kev qhia tshwj xeeb thiab qhov ntau thiab tsawg ntawm cov alumina cib siab, uas tuaj yeem siv rau ntau yam thermal kilns xws li steel kev lag luam, cov khoom siv hauv tsev, thiab kev lag luam fais fab.
Generally speaking, aluminum silicate refractories with Al₂O₃ content greater than 48% are collectively referred to as high-alumina refractories. The finalized products are commonly used high-alumina bricks, which are generally divided into three grades: Class I: Al₂O₃>75% yog '; Chav Kawm II: Al₂O₃ 60% ~ 75%; Chav Kawm III: Al₂O₃ 48% ~ 60%.
Hluav taws kub alumina refractory cib, feem ntau ntawm qhov kub thiab txias ntawm 1700 txog 1800 degree;
Kev tua hluav taws theem nrab high-alumina refractory cib, feem ntau ntawm qhov kub kub ntawm 1600 txog 1700 degree;
Hluav taws kub peb-theem high-alumina refractory cib, feem ntau ntawm qhov kub thiab txias ntawm 1500 txog 1600 degree;
Cov txheej txheem ntau lawm ntawm siab alumina bricks thiab multi-clinkerav nplaum cibzoo ib yam. Cov ntaub ntawv tseem ceeb refractory yog: siab alumina bauxite tsuas yog tsim los ntawm hydrated bauxite (monohydrate, gibbsite, thiab lwm yam); sillimanite pawg minerals (xws li kyanite, andalusite, sillimanite, thiab lwm yam); cov khoom siv hluavtaws, xws li cov khoom siv alumina, hluavtaws mullite, fused corundum, thiab lwm yam. Qhov txawv yog tias qhov feem ntawm clinker hauv cov khoom xyaw yog qhov siab, uas tuaj yeem siab li 90% ~ 95%. Lub clinker yuav tsum tau muab cais thiab sieved kom tshem tawm cov hlau ua ntej crushing. Qhov kub ntawm qhov hluav taws kub yog qhov siab, xws li tunnels rau siab alumina cib xws li I thiab II. Nws feem ntau yog 1500 ~ 1600 degree thaum lub sijhawm tua hluav taws.
Lub refractoriness ntawm siab alumina bricks fluctuates nyob rau hauv ib tug ntau yam, feem ntau 1770 ~ 2000 degree, uas yog feem ntau cuam tshuam los ntawm cov ntsiab lus ntawm Al₂O₃, thiab nce nrog nce ntawm cov ntsiab lus ntawm Al₂O₃ nyob rau hauv cov khoom. Nyob rau tib lub sijhawm, lub refractoriness kuj cuam tshuam los ntawm cov ntsiab lus thiab hom impurities, thiab muaj feem xyuam rau cov ntxhia theem qauv ntawm cov khoom.
Qhov pib deformation kub ntawm high-alumina bricks nyob rau hauv load yog ntau tshaj 1400 degree, thiab nws nce nrog rau qhov nce ntawm Al₂O₃ cov ntsiab lus. Rau cov khoom uas muaj Al₂O₃ cov ntsiab lus tsawg dua 71.8%, lub load softening kub nyob ntawm seb muaj pes tsawg tus piv ntawm mullite thiab iav theem, thiab nws nce raws li qhov ntau ntawm mullite nce. Qhov ntau thiab qhov xwm txheej ntawm cov iav theem muaj qhov cuam tshuam tseem ceeb ntawm qhov muag muag hauv qab load. Thaum cov ntsiab lus ntawm Al₂O₃ yog 71.8% ~ 90%, nws yog mullite thiab corundum khoom. Nrog rau qhov nce ntawm Al₂O₃ cov ntsiab lus, lub iav phasor yeej tsis hloov pauv. Txawm hais tias corundum nce, mullite txo; Yog li ntawd, qhov softening kub ntawm load tsis nce. Qhov tseem ceeb. Tom qab cov ntsiab lus ntawm Al₂O₃ tshaj 90%, raws li cov ntsiab lus ntawm Al₂O₃ nce, tus nqi ntawm cov iav theem txo, thiab cov softening kub nyob rau hauv load nce ho, los ntawm 1630 degree ntawm 90% ntawm Al₂O₃ mus rau 1900 degree ntawm 100% ntawm Al₂O₃, thiab Lub softening kub nyob rau hauv load nce nrog nce ntawm Al₂O₃ cov ntsiab lus. txhim kho.
Lub thermal conductivity ntawm siab alumina bricks txo nrog nce kub. Thaum cov ntsiab lus Al₂O₃ nyob rau hauv lub siab alumina cib siab dua, ntau cov mullite thiab corundum crystals muaj, qhov pom tseeb dua qhov nyiam ntawm thermal conductivity txo nrog qhov nce ntawm qhov kub thiab txias. Tab sis siab dua 1000 degree, tus nqi poob qis.
