Magnesium Aluminium Spinel (MgAl2O4)

Magnesium aluminate spinel (MgAl2O4) yog ib qho yooj yim refractory khoom uas muaj feem ntau ntawm magnesium thiab alumina ua raw cov ntaub ntawv, raws li zoo raws li hluavtaws spinel refractory raw cov ntaub ntawv. Cov khoom siv yooj yim no tsis tshua pom muaj nyob hauv qhov xwm txheej, thiab tag nrho cov magnesium-aluminium spinel siv hauv kev lag luam yog tsim tshuaj. High-zoo bauxite nrog ib qho Al2O3 concentration ntawm ntau tshaj 76 feem pua ​​thiab high-zoo lub teeb-hlwb magnesium hmoov nrog ib tug MgO cov ntsiab lus ntawm ntau tshaj 95 feem pua ​​yog siv nyob rau hauv bauxite-based sintered magnesia-aluminium spinel. Saum toj no, sintered ntawm qhov kub thiab txias.

Magnesium aluminium spinel (MgAl2O4) yog tib qhov sib xyaw nruab nrab hauv MgO-Al2O3 binary system. Lub theoretical muaj pes tsawg leeg ntawm cov ntaub ntawv rwb thaiv tsev yog MgAl2O4 los yog MgOAl2O3. Nws cov qauv siv lead ua yog nyob rau hauv equiaxed crystal system, thiab qhov thib ob-txiav cations tau sau nyob rau hauv yim Plaub-kev sib koom tes yog tsim nyob rau hauv ib qho ntawm tetrahedral voids, thiab qhov thib peb-txiav cations tau sau rau hauv ib nrab ntawm octahedral voids rau daim ntawv. yim-kev sib koom tes, thiab cov pa oxygen ions tau teem rau hauv cubic kaw packing. Al-O thiab Mg-O tau ua ke los ntawm kev sib koom ua ke los ntawm cov ntawv cog lus muaj zog, thiab lawv cov khoom siv hluav taws xob electrostatic sib npaug, thiab cov qauv ruaj khov. Yog li ntawd, cov qauv siv lead ua ntawm magnesium-aluminium spinel yog saturated, thiab nws muaj thermal shock stability, tshuaj corrosion kuj thiab ntxiv rau, magnesium-alumina refractory cov ntaub ntawv MgAl2O4 kuj muaj cov yam ntxwv ntawm siab melting point (2135 degree), siab tshuaj stability. , thiab qis thermal expansion coefficient.

Magnesium-aluminum spinel belongs to equiaxed minerals, n=1.715, hardness=8, relative density 3.55, melting point 2135℃. High-purity magnesium-aluminum spinel is colorless, but it is red when it contains a small amount of Cr²+, green when it contains Cr+>15 feem pua, nyom ntsuab thaum nws muaj me me ntawm Fe3 ntxiv, thiab ntuj xiav thaum nws muaj Fe2 ntxiv. Magnesium-aluminium spinel crystals tsim nyob rau hauv tej yam ntuj tso tej yam kev mob muaj zoo tshuaj stability, yog li lawv feem ntau pom nyob rau hauv bleaching xuab zeb deposits. Zoo-tsim, ntshiab-muaj magnesium-aluminium spinel crystals tsis hydrate los yog hnov ​​nrog acids.

Spinel refractories nrog magnesium aluminium spinel yog cov khoom siv tseem ceeb hauv cov cement rotary kilns, ladles, pob tshab ceramics, Nuclear roj thiab roj hlwb, thiab lwm yam.

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