Magnesia alumina cib yog superior rau magnesia cib hauv thermal poob siab vim nws lub ntsiab siv lead ua theem ntawm periclase thiab matrix ntawm magnesia-alumina spinel. Txhawm rau txhim kho cov thermal shock tsis kam ntawm magnesia cib, alumina los yog bauxite clinker hmoov zoo yog nkag mus rau hauv cov khoom xyaw los tsim magnesia alumina spinel matrix, yog li ua rau nws. Uas yog tus cwj pwm los ntawm kev ua haujlwm zoo thermal shock, siab load softening kub, load softening kub siab tshaj 1580 degree, thiab zoo iav corrosion kuj. Nrog rau qhov nce ntawm cov ntsiab lus, pom meej porosity ntawm cib nce. Txawm li cas los xij, thaum cov ntsiab lus tsawg dua 10 feem pua, lub cib tseem ntom ntom, thiab qhov pom meej porosity tuaj yeem ncav cuag 14 feem pua, feem ntau 15 feem pua ~ 18 feem pua. Cov yas ntws ntawm nws pib ntawm 1000 ~ 1200 degree thiab nrawm ntawm 1300 degree. Zoo ib yam li magnesia-chrome cib, tab sis txawv ntawm magnesia cib, qhov kub ceev ntawm magnesia cib yog 100 ~ 200 degree siab dua. Thaum tus nqi ntawm alumina ntxiv yog tsawg dua 15 feem pua, nws yuav tsis nthuav thaum reacting nrog hlau oxide; Thaum tus nqi ntxiv mus txog 15 feem pua, nws yuav nthuav me ntsis; 20 feem pua; 28 feem pua tau mob hnyav heev.
Piv nrog magnesia cib, nws muaj cov yam ntxwv hauv qab no: 1. nws muaj thermal shock stability zoo thiab tuaj yeem tiv taus 20 ~ 25 zaug lossis ntau dua dej txias. Nws muaj qhov zoo thermal poob siab vim tias ob qho tib si magnesia-alumina spinel thiab periclase muaj nyob rau hauv cubic crystal system, thiab thermal expansion ntawm txhua lub axis siv lead ua yog tib yam, yog li qhov nthuav dav thiab kev cog lus zoo sib xws thaum kub hloov pauv, thiab thermal stress me me. . 2. Lub ntsiab kev ua tau zoo ntawm nws yog me ntsis muaj zog dua li ntawm magnesia cib. Vim lub siab melting point ntawm magnesia-alumina spinel, lub load softening kub ntawm nws yog zoo dua li ntawm magnesia cib, ncav cuag 1620 ~ 1690 degree. Magnesia-alumina spinel tuaj yeem tiv thaiv cov kab mob periclase los ntawm slag yaig dua li montmorillonite, yog li magnesia alumina cib muaj zog tiv thaiv alkaline slag thiab hlau oxide slag dua li magnesia cib. Magnesia alumina cib muaj cov khoom zoo tshaj plaws saum toj no, yog li nws tau dav siv los ua cov khoom siv masonry rau sab saum toj ntawm cov kub kub smelting furnaces xws li steel ua qhib hearth rauv thiab tooj liab reverberatory rauv hauv Suav teb, thiab tau ua tiav cov nyhuv ntawm lub neej ntev ntawm lub cub tawg. Muaj txog 300 qhov loj qhib hearth furnaces thiab ntau tshaj 1000 nruab nrab thiab me me qhib hearth furnaces.
Cov txheej txheem ntawm nws yog roughly tib yam li ntawm raug rho tawm magnesia cib, tsuas yog hais tias ib tug tej feem ntawm industrial alumina los yog tshwj xeeb bauxite clinker yog ntxiv rau cov khoom xyaw. Cov ntsiab lus impurity ntawm industrial alumina yog qis dua li ntawm high-alumina clinker. Ntxiv natural bauxite clinker tuaj yeem txhim kho cov yas ntawm av nplaum. Nyob rau tib lub sijhawm, qhov ntom ntom ntawm cib ntau dua. Qhov sib ntxiv ntawm kev lag luam alumina feem ntau yog 5% ~ 10 feem pua. Nws yog feem ntau ntxiv rau hauv daim ntawv ntawm cov hmoov zoo tom qab sib tsoo nrog magnesite nyob rau hauv ib qho kev faib ua feem, uas yog conducive rau tsim ntawm tshiab siv lead ua theem ntawm magnesia-alumina spinel nrog uniform tis nyob rau hauv cov khoom matrix. Qhov kub ntawm qhov hluav taws kub ntawm nws nyob ntawm qhov purity ntawm raw cov ntaub ntawv, feem ntau 30 ~ 50 degree siab tshaj qhov ntawm nws, thiab firing kub ntawm high-purity nws mus txog 1750 ~ 1800 degree.
