Magnesia alumina spinel cib

Magnesia alumina spinel cib siv thawj cib magnesia thiab sintered magnesia alumina spinel xuab zeb nrog C/S piv ntawm 0.4 ua raw khoom, nrog qhov loj me me ntawm 3mm. Qhov loj me me ntawm magnesia txais yuav 3 ~ 1mm cov khoom loj, <1mm nruab nrab hais thiab <0.088mm hmoov zoo li peb qib cov khoom xyaw. Siv sulfite pulp pov tseg cov kua ua cov neeg sawv cev khi, sib xyaw nrog ntub zeb, thiab tsim los ntawm 300t txhuam txhuam cib xovxwm. Tom qab lub cev ntsuab qhuav, nws raug rho tawm ntawm 1560 ~ 1590 ° C. Qhov chaw tsis muaj zog oxidizing yuav tsum raug tswj thaum lub sijhawm tua.

Cov khoom siv hluav taws xob kub thiab qhov kub poob siab ruaj khov ntawm periclase-spinel cib yog qhov zoo dua li cov cib magnesia alumina zoo tib yam. Lub zog sib zog ntawm chav sov yog 70-100MPa, thiab qhov kub poob siab ruaj khov (1000 ℃, dej txias) yog 14-19 zaug. Cov cib periclase-spinel tuaj yeem siv rau thaj tsam kub ntawm cov txiv qaub ua haujlwm rauv kilns thiab cement rotary kilns.

kuv lub teb chaws magnesium-aluminium spinel txais yuav ob txheej txheem tsim khoom: sintering thiab fusion. Cov ntaub ntawv nyoos feem ntau yog magnesite thiab muaj alumina hmoov lossis bauxite. Raws li qhov ntsuas sib txawv ntawm magnesia thiab alumina, magnesia-nplua nuj spinel thiab txhuas-nplua nuj spinel tau muab cais thiab siv rau hauv ntau thaj chaw.

1. Raws li cov txheej txheem tsim khoom lossis txheej txheem: sintered magnesium aluminium spinel (sintered spinel) thiab fused aluminium magnesium spinel (fused spinel).

2. Raws li cov khoom siv raw, nws tuaj yeem faib ua: bauxite-based magnesia-aluminium spinel thiab alumina-based magnesia-aluminium spinel. (Sintering lossis electrofusion)

3. Raws li cov ntsiab lus thiab kev ua tau zoo, nws tau muab faib ua: magnesium-nplua nuj spinel, aluminium-nplua nuj spinel thiab nquag spinel.

Magnesia alumina spinel cib kuj tseem hu ua periclase-spinel cib, uas yog ua los ntawm high-purity fused magnesia lossis siab-purity ob-kauj ruam calcined magnesia thiab high-purity pre-synthesized magnesia-aluminium spinel ua cov khoom tseem ceeb, siv cov khoom xyaw meej Forming Kev kub siab sib sau ua ke thiab kub ua kom kub txheej txheem ntau lawm. Piv nrog magnesia-chromium cib, cov magnesia-aluminium sib xyaw ua ke cib tsis yog tsuas yog tshem tawm qhov kev puas tsuaj ntawm hexavalent chromium, tab sis kuj tseem muaj kev txhim kho corrosion zoo, oxidation-txo qis, tiv tshav kub thiab kub ntim ruaj khov. Nws yog cov cement loj thiab nruab nrab Qhov tsim nyog tshaj plaws uas tsis muaj chromium tsis muaj cov khoom siv hluav taws xob rau thaj chaw hloov pauv ntawm cov khoom siv hluav taws xob. Nws kuj tau siv rau hauv cov khoom siv kub-txias xws li cov txiv qaub rauv, lub qhov cub iav, thiab cov khoom siv ua kom tsis siv lub tshuab ua kom sov, thiab tseem tau ua tiav cov txiaj ntsig zoo.

Kev ntsuas lub cev thiab tshuaj lom neeg ntawm cov khoom tsim tawm magnesium-aluminium spinel cib yog: MgO 82.90%, Al2O3 13.76%, SiO2 1.60%, Fe2O3 0.80%, pom porosity 16.68%, ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntaws 2.97g/cm3 54.4 ℃ flexural zog 1400MPa.

Magnesium-aluminium spinel cib tau ua tiav siv thaj chaw hloov pauv ntawm cov cement rotary kilns, tab sis lawv muaj feem cuam tshuam rau cov txheej txheem embrittlement thiab cov txheej txheem spalling thaum siv hauv thaj chaw tua hluav taws, nyuaj rau dai rau ntawm daim tawv nqaij kiln, thiab muaj kev tiv thaiv tsis zoo rau alkali chav thiab cement clinker kua theem permeability. Thiab lub peev xwm tsis zoo los tawm tsam cov tshuab kev nyuab siab tshwm sim los ntawm kev hloov pauv ntawm lub cev kiln txwv cov ntawv thov hauv thaj chaw tua hluav taws. Vim li no, cov kws tshawb fawb tau tsim kho hloov magnesia-aluminium spinel cib haum rau thaj chaw tua hluav taws ntawm cov cement rotary kilns. Thaum lub sij hawm tua thiab siv, ib feem ntawm Fe2+ hauv periclase-spinel refractory qauv yog oxidized rau Fe3+. Tom qab ntawd, ib feem ntawm Fe2+ thiab Fe3+ hauv cov hlau-aluminium spinel diffuses rau hauv periclase matrix los tsim MgOss. Nyob rau tib lub sijhawm, qee qhov Mg2+ hauv daim ntawv tseem nthuav tawm mus rau hauv cov hlau-aluminium spinel hais, thiab ua haujlwm nrog Al2O3 seem los ntawm kev decomposition ntawm hlau-aluminium spinel los tsim magnesium-aluminium spinel. Cov koob tshuaj tiv thaiv kab mob no suav nrog kev nthuav dav ntim, ua rau tsim cov microcracks. Rau

Cov hlau-aluminium spinel cib muaj cov khoom zoo kiln-dai thiab thermal poob siab tsis kam. Ntawm lawv, yog vim li cas cov hlau txhuas spinel dai zoo ntawm daim tawv nqaij kiln zoo ib yam li cov mafic-iron spinel cib. Nws kuj tseem yog vim qhov ua ntawm CaO hauv cov cement clinker thiab cov khoom sib xyaw ua ke Fe2O3 hauv periclase los tsim cov nplais uas tuaj yeem ntub periclase. , Calcium ferrite uas ua ke clinker thiab firebrick ua ke. Yog vim li cas rau qhov zoo thermal poob siab kuj yog tsim ntawm microcracks.

Hauv MgO-Al2O3 cov txheej txheem, cov khoom sib tov ntawm Al2O3 hauv periclase ntawm 1600 ° C yog li 0; qhov kev daws teeb meem ntawm 1800 ° C tsuas yog 5%, uas yog me dua Cr2O3. Hauv MgO-Al2O3 system, tsuas yog cov sib xyaw ua ke yog magnesium aluminium spinel. Lub ntsiab lus melting ntawm magnesium aluminium spinel yog siab li 2135 ℃, thiab qhov kub qis tshaj ntawm MgO-MA kuj yog 2050 ℃. Magnesium-aluminium spinel yog cov ntxhia ntuj, uas feem ntau pom muaj nyob hauv cov tshuaj dawb ua cov xuab zeb, yog li nws muaj tshuaj zoo ruaj khov rau cov khoom siv ntuj tsim.

Modulus ntawm elasticity yog me me, magnesia alumina cib (0.12 ～ 0.228) × 105 MPa, thaum magnesia cib yog (0.6 ～ 5) × 105MPa; MA tuaj yeem hloov MF los ntawm periclase, thiab tuaj yeem cheb FeO. Cov tshuaj tiv thaiv muaj raws li hauv qab no: FeO+MgO • AI2O3 → MgO+FeAl2O4, FeO+MgO → (Mg • Fe) O, MA nqus Fe2O3 thiab nthuav me ntsis thiab muaj lub siab melting. Spinel muaj lub ntsiab lus yaj ntawm 2135 ° C, thiab nws thawj qhov kub yaj nrog periclase siab dua 1995 ° C. Kev sib xyaw ua ke ntawm ob qho no yuav txhim kho kev sib koom ua ke ntawm magnesia cib. Lub ntsuas kub ua kom sov siab yog siab, tab sis kev tsim cov spinel nrog rau kev nthuav dav ntxiv, thiab kev sib sau ua ke thiab rov ua dua tshiab muaj peev xwm ua kom tsis muaj zog, yog li yuav tsum tau kub kub dua. Zoo heev thermal poob siab kuj. siab zog. Muaj zog yaig tsis kam.