Magnesia alumina cib

Magnesia alumina cib yog ua los ntawm cov khoom siv zoo sintered magnesia thiab kwv yees li 8%ntshiab Al2O3 cov hmoov zoo lossis cov qib high-alumina bauxite (Al2O3> 78%, SiO2 <20%, me me ntawm Fe2O3 thiab lwm yam tsis huv), siv sulfite pulp pov tseg cov kua ua ib phau ntawv, Alkaline cov khoom siv hluav taws xob ua los ntawm kev sib xyaw, sib xyaw, sau nqi, kom qhuav, tua thiab lwm yam txheej txheem.

Cov ntsiab lus magnesium oxide hauv cov magnesia alumina cib yog li 85%. Cov ntsiab lus alumina yog 5% txog 10%, cov khoom siv ua kom tsis sib haum nrog periclase ua cov theem siv lead ua tseem ceeb thiab magnesia-aluminium spinel raws li theem siv lead ua theem ob (raws li theem tseem ceeb khi). Qhov pom kev porosity feem ntau yog 15-18%. Cov coefficient ntawm thermal nthuav dav yog 10.6 × 10-6/° C. Cov cua sov poob siab ua haujlwm zoo dua li cov cib magnesia sib xws. Vim tias magnesium aluminium spinel nrog cov ntsiab lus melting siab dua tau muab faib rau hauv cov lej, nws qhov kub siab zog yog siab dua, thiab qhov pib kub ntawm qhov muag muag muag siab dua 1580 ° C. Kev tiv thaiv slag kuj zoo dua. Feem ntau, cov khoom siv zoo sintered magnesia yog siv ua cov khoom siv, thiab cov hmoov zoo tsim los ntawm magnesia thiab bauxite lossis lub teeb-hlawv bauxite clinker lossis industrial alumina tau ntxiv rau hauv ib qho kev faib ua feem, thiab nws tau los ntawm kev sib xyaw, tsim thiab tua.

1. Magnesia alumina cib tuaj yeem ua los ntawm kev ntxiv 5-10% Al2O3 rau sintered magnesia. A12O3 tau ntxiv rau hauv cov hmoov zoo hauv daim ntawv ntawm kev lag luam alumina lossis qib alumina bauxite clinker.

2. Yog tias Al2O3 tau qhia nrog alumina pob zeb siab hauv av, nws tau cog lus los qhia qhov tsis xws xws li SiO2 tib lub sijhawm, yog li txo qhov refractoriness thiab kub zog lub zog ntawm cov khoom. Yog li, tus nqi ntawm alumina ntxiv yuav tsum tsis txhob loj heev.

3. Cov txheej txheem tsis rau kev tsim cov magnesia alumina cib yog ntxhib zoo ib yam li cov cib magnesia. Nws tsuas yog tias qhov ntsuas kub feem ntau siab tshaj qhov kub ntawm magnesia cib los ntawm 30-50 ° C, mus txog 1750-1800 ° C.

Magnesia alumina cib muaj cov yam ntxwv hauv qab no:

1. Magnesia alumina cib muaj cov cua sov zoo ruaj khov thiab tuaj yeem tiv taus dej txias txog 20-25 zaug lossis siab dua. Qhov no yog nws qhov txiaj ntsig tseem ceeb tshaj plaws. Magnesia alumina cib muaj cov cua kub zoo ruaj khov. Ob leeg magnesia alumina spinel thiab periclase koom nrog cov txheej txheem siv lead ua cubic. Kev nthuav dav cua sov raws txhua qhov kev taw qhia ntawm qhov siv lead ua zoo ib yam, yog li kev nthuav dav thiab kev cog lus yog ob qho tib si thaum qhov kub hloov pauv. Nws yog ntau dua qub thiab ua kom muaj cua sov tsawg dua.

2. Cov khoom tseem ceeb ntawm magnesia alumina cib kuj tseem muaj zog dua li cov cib magnesia. Vim tias lub siab melting point ntau dua ntawm magnesia-aluminium spinel nws tus kheej, qhov hnyav ua kom sov ntawm magnesia-aluminium cib yog qhov zoo dua li ntawm magnesia cib, mus txog 1620 ～ 1690 ℃.

3. Cov tshuaj lom neeg muaj pes tsawg leeg ntawm magnesia-txhuas cib sib txawv nrog cov khoom sib txawv, feem ntau yog MgO> 81%, Al2O3 8.7%, SiO2 <6.0%, CaO <1.5%, Fe2O3 <1.0%.

4. Cov tshuaj muaj pes tsawg leeg ntawm magnesia alumina cib. Hauv nws cov tshuaj muaj pes tsawg leeg, lub ntsiab siv lead ua yog periclase, thiab cov lej yog tsim los ntawm magnesium ferrite, forsterite, forsterite thiab magnesia spinel.

5. Lub refractoriness thiab load softening kub ntawm magnesia alumina cib. Hauv magnesia alumina cib, periclase muaju thiab magnesia alumina spinel tsim lub network moj khaum. Txawm hais tias qhov me me ntawm cov ntsiab lus qis melting impurities tau sau rau hauv qhov khoob ntawm lub network moj khaum, lub network moj khaum tseem yog Nws muaj peev xwm tiv taus qhov kub thiab txias, yog li qhov refractoriness thiab load softening kub ntawm magnesia alumina cib yog qhov siab, qhov refractoriness tuaj yeem ncav cuag 2100 ℃, thiab qhov hnyav ua kom sov yog 1570 ℃.

6. Lub thermal nthuav thiab thermal stability ntawm magnesia-txhuas cib. Vim tias qhov nthuav dav nthuav tawm coefficient ntawm magnesia-aluminium spinel me me, txoj kab nthuav dav nthuav tawm ntawm magnesia-aluminium cib yog qhov me me. Hauv thaj tsam ntawm 20 ~ 1000 ℃, qhov nthuav dav nthuav tawm coefficient ntawm magnesia alumina cib tsuas yog 10.6 × 10-6 ℃ -1. Vim tias magnesia alumina spinel ua lub luag haujlwm txhim kho cov cua sov tiv taus hauv cov cib, magnesia alumina cib muaj cov cua sov zoo dua tiv taus, thiab cov dej txias ntau dua 20 zaug.

7. Cov slag tsis kam ntawm magnesia-txhuas cib. Vim tias magnesia-txhuas cib muaj qhov 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 ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom nti tuaj yeem ua rau magnesia-aluminium spinel, thiab AI2O3 yog ib qho nruab nrab nruab nrab oxide, yog li magnesia-txhuas cib Muaj peev xwm tiv taus cov kua qaub thiab alkaline slag yaig kuj muaj zog.

Lub peev xwm ntawm magnesia alumina cib los tiv thaiv periclase hais los ntawm slag yaig muaj zog dua li ntawm forsterite, yog li lub peev xwm ntawm magnesia alumina cib los tiv thaiv alkaline slag thiab hlau oxide slag tau muaj zog.

Magnesia-alumina cib muaj cov cuab yeej hais los saum toj no, yog li lawv tau siv dav ua cov khoom siv masonry rau lub ru tsev ntawm qhov kub thiab txias qhov cub tawg xws li hlau-ua qhib-hearth rauv thiab tooj liab-smelting reverberatory rauv, thiab tau ua tiav cov nyhuv ntawm ncua lub neej ntawm lub cub tawg. Qhov qhib qhov cub loj tuaj yeem ncav cuag li 300 lub cub tawg, thiab nruab nrab thiab me me qhib qhov cub muaj ntau dua 1000 lub cub tawg.