Lub ntsiab siv lead ua theem ntawm magnesia cib yog periclase, uas muaj cov yam ntxwv ntawm cov khoom alkaline refractory, tab sis nws cov thermal shock kuj tsis zoo.
Nws tuaj yeem raug rho tawm haujlwm thiab tsis raug rho tawm haujlwm. Cov hluav taws xob magnesia cib tau muab faib ua silicate bonding, ncaj qha kev sib txuas thiab recombining magnesia bricks. Cov unburned sawv daws yuav muab faib ua chemical bonding thiab asphalt bonding magnesia bricks.
Nws tau tsim thawj zaug hauv Austria xyoo 1880s. Tom qab ntawd, Tebchaws Asmeskas thiab Russia kuj tau pib tsim khoom hauv xyoo 1895 thiab 1900, raws li. Nyob rau xyoo 1960 thiab 1980s, lawv tau pib ntau lawm ntawm recombination thiab ncaj qha bonding magnesia bricks, feem.
Nws cov khoom siv raw yog cov magnesite, thiab nws cov ntsiab lus tseem ceeb yog MgCO3, uas yog calcined ntawm qhov kub thiab txias thiab tom qab ntawd crushed rau qee qhov loj los ua sintered magnesia. Magnesium xuab zeb yog dav siv los ua cov khoom siv kho cua sov thiab cov khoom siv ramming. Magnesium xuab zeb nrog tsawg impurities (ω(CaO)<2.5%, ω(SiO2)<3.5%). The reserves and output of magnesium ore in my country rank among the top in the world.
Raws li cov txheej txheem ntau lawm, nws tuaj yeem muab faib ua sintering thiab tshuaj sib xyaw ua ke. Lub sintered magnesia cib yog tsim los ntawm magnesia uas tau raug hlawv thiab muaj qhov sib npaug ntawm qhov loj me, ntxiv nrog brine (MgCl2 aqueous tov) thiab sulfite pulp pov tseg kua ua tus neeg sawv cev khi, pressurized thiab molded, thiab raug rho tawm ntawm qhov kub ntawm { {1}} degree. Cov tshuaj sib xyaw ua ke tsis dhau ntawm cov txheej txheem sintering. Tom qab sintered magnesia tau npaj raws li qhov sib piv ntawm qhov loj me, qhov tsim nyog ntawm cov ntxhia pob zeb thiab cov neeg sawv cev sib txuas ntxiv, nias rau hauv cov duab, thiab ziab kom dhau los ua cov khoom tiav. Lub zog ntawm cov tshuaj sib txuas yog tsawg, thiab kev ua haujlwm tsis zoo li sintered, tab sis tus nqi pheej yig dua, tsawg dua ib nrab ntawm cov nqi sintered. Nws yog siv nyob rau hauv qhov chaw uas tsis tshua muaj kev xav tau, xws li cov hauv qab ntawm lub cub tawg thiab cov cua sov so.
Magnesia cib yog cov khoom siv alkaline refractory, uas muaj zog tiv thaiv alkaline slag, tab sis tsis tuaj yeem tiv taus qhov yaig ntawm acid slag. Nws tuaj yeem cuam tshuam nrog silica cib, av nplaum cib thiab txawm tias alumina cib siab ntawm qhov kub ntawm 1600 degree. Nws refractoriness yog siab tshaj 2000 degree, tab sis nws softening point nyob rau hauv load tsuas yog 1500 ~ 1550 degree. Tsis tas li ntawd, lub sijhawm kub ntawm qhov muag mus rau 40 feem pua ntawm deformation yog me me, thiab qhov thermal stability tsuas yog 30 ~ 50 degree kuj tsis zoo, uas yog ib qho tseem ceeb rau nws kev puas tsuaj.
Hauv cov cua kub cua sov thiab cov cua sov so, nws tsuas yog siv los ua cov txheej txheem hauv qab thiab sab qis ntawm phab ntsa ntub dej. Nws tuaj yeem tiv thaiv corrosion ntawm oxide nplai.
