Gulu ndi magwiridwe antchito a aluminium-magnesium spinel?

Makhalidwe apadera a magnesium-aluminium spinel, monga slag dzimbiri, kukana kwamphamvu kwamphamvu kwamphamvu komanso kutentha kwambiri, zimapangitsa kuti igwiritsidwe ntchito kwambiri pazinthu zopangira zitsulo. Kukonzekera kwa spinel yopangidwa mwaluso kwambiri kumapereka zinthu zatsopano zopangira zida zopangika bwino komanso zoyera. Kenako, mkonzi wa Qianjiaxin Refractories akuwuzani:

Njira ziwiri zikuluzikulu zopangira spinel ndi sintering ndi electrofusion. Zipangizo zambiri zopangidwa ndi spinel zimapangidwa ndi pure-purity synthetic alumina komanso mankhwala a magnesia, omwe amalowetsedwa mu uvuni ndi kusungunuka kwamagetsi mu ng’anjo yamagetsi. Ubwino wa sintered magnesia-aluminium spinel ndikuti njirayi ndi njira yopitilira kuyika miyala, yomwe imayendetsa kuthamanga kwa kudyetsa komanso kutentha kokwanira pamoto, zomwe zimapangitsa kukula kwa kristalo yofanana ndi 30-80μm ndi porosity low (<3%) Zogulitsa.

Kupanga kwa magnesium-aluminium spinel mwa njira ya electrofusion ndi ntchito yoyimira gulu. Malo akuluakulu oponyera amafunika kukulitsa nthawi yozizira. Kuzirala kwa malo oponyera kumabweretsa ma microstructure osagwirizana. Chifukwa chozizira kwambiri, makhiristo akunja a spinel ndi ocheperako kuposa makhiristo amkati amkati. Malo osungunuka otsika amakhala mkati. Chifukwa chake, ndikofunikira kusanja ndi kusungunula zopangira za magnesia-aluminium spinel zopangira.

Ubwino wina wogwiritsa ntchito zopangira zoyera kwambiri kuti apange aluminiyamu-magnesium spinel ndizotsika pang’ono mu aluminium-magnesium spinel aggregate (MgO A1203> 99%), makamaka zotsika za SiO2, zomwe zimapangitsa kukhala ndi kutentha kwakukulu . Spinel yochokera ku Bauxite siyabwino ngati spinel yopanga alumina, ndipo imatha kugwiritsidwa ntchito m’malo okhala ndi zofunikira zochepa pakuthana ndi dzimbiri komanso kutentha kwambiri.

Magnesium-rich (MR) aluminium spinel:

Kupezeka kwa trace periclase mu magnesium-rich aluminium spinel kumakhudza mawonekedwe ndi kugwiritsa ntchito kwa spinel. Popeza sipinala yolemera kwambiri ya magnesia MR66 ilibe alumina yaulere, spinel sidzapanganso spinel pambuyo powonjezeredwa ku njerwa za magnesia ndipo ichulukira mu voliyumu. Kugwiritsa ntchito njerwa za magnesia ndi MR56 mumakina oyenda simenti kumatha kusintha kusintha kwamphamvu kwa Thermal ndipo kumatha kulowa m’malo mwa chrome ore. Makina omwe amasintha kukana kwamphamvu kwa matenthedwe ndikuti spinel imakulitsa kutenthetsa pang’ono kuposa periclase.

Kuchuluka kwa MgO mu MR66 kumakhudza momwe amagwiritsidwira ntchito popanga zinthu monga madzi. Chifukwa cha kutulutsa kwa periclase, brucite (Mg (OH) 2) itha kupangidwa, zomwe zingapangitse kuti voliyumu isinthe ndikupangitsa ming’alu. Maginesiamu olemera kwambiri a aluminium spinel amatha kugwiritsidwa ntchito m’makina a simenti, makamaka mu tyerere komanso malo otentha kwambiri.

Aluminium wolemera (AR) magnesium spinel:

Refractory yopangidwa ndi rich aluminium-magnesium spinel imagwiritsidwa ntchito kwambiri pakupanga chitsulo. Makhalidwe awiri akulu amalimbikitsa kugwiritsa ntchito sipinamu yolemera ya aluminium-magnesium: imatha kusintha mphamvu yakutentha kwambiri komanso kukana kwamphamvu kwa zinthuzo, komanso kukana kwazitsulo kwazitsulo. Kuphatikiza kwa pure-pure-aluminium-magnesium wolemera spinel ku alumina castable amasintha kwambiri kutentha kwapamwamba.

Zomwe zimayambira mu aluminium-magnesium spinel Refractories nthawi zambiri zimakhala 15% -30% (yolingana ndi 4% -10% MgO). Kafukufuku waposachedwa akukhulupirira kuti m’malo opukutira a Al-Mg spinel a ladle, low-silicon (<0.1% SiO2) poyerekeza ndi high-silicon (1.0% SiO2) Al-Mg spinel njerwa zitha kuchepetsa moyo wa ladle ndi 60%. Izi zikuwonetsa kuti magwiridwe antchitowo akhoza kungoyikidwa pazinthu zopanga zoyera kwambiri.

Kuyerekeza pakati pa pre-synthesized magnesia-aluminium spinel ndi in-situ mapangidwe a magnesia-aluminium spinel:

Kupanga spinel in situ mu zotheka kumatha kuchepetsa ndalama zopangira, koma njirayi ilinso ndi zovuta. Alumina ndi magnesia akamagwira ntchito popanga spinel, padzakhala kukulira kwa voliyumu. Malinga ndi kuwerengera ongolankhula za dongosolo wandiweyani, kukula buku angafikire 13%, koma leni kukula buku ndi za 5%, amene akadali mkulu, Kodi kupewa kupezeka kwa ming’alu structural. Zowonjezera za ufa wa silicon (monga ufa wa silicon) zimagwiritsidwa ntchito kulimbikitsa kutsetsereka kwamadzimadzi ndikulola kusinthaku kwina kuti kuletse kukula kwa voliyumu. Komabe, mphamvu yotentha kwambiri yamagalasi otsala imakhudza kwambiri.