Ntau yam magnesia bricks ntawm refractory cib
Tab sis nyob rau hauv dej kub los yog boiling dej nws yog cov tshuaj sib npaug zos reacts: MgO + H2O= cua sov =Mg(OH)2 Cov tshuaj tiv thaiv tshwm sim nyob rau hauv dej kub. Yog li cov tshuaj tiv thaiv no nyob ntawm cov xwm txheej uas nws tshwm sim. Nws reacts nrog dej rau cov laj thawj hauv qab no:
1. Magnesium hydroxide generated los ntawm cov tshuaj tiv thaiv ntawm magnesium oxide nrog dej yog cov dej-soluble tshuaj, uas yog qhwv nyob rau hauv lub nto ntawm magnesium oxide thiab inhibits cov tshuaj tiv thaiv ntxiv ntawm magnesium oxide thiab dej. Txawm hais tias Mg (OH) 2 yog insoluble nyob rau hauv dej, nws yog ib tug nruab nrab muaj zog puag, yog li ntawd muaj ib tug me ntsis dej, thiab tus nqi ntawm tsuas yog generated yog heev me me. Yog hais tias cov tshuaj yog saturated, me me yog txuas nrog magnesium cib, tab sis nws tsis pom. Mg (OH) 2 decomposes saum 200 degrees.
2, tus nqi ntawm cov tshuaj tiv thaiv tshuaj thiab qhov kub thiab txias yog zoo sib xws, feem ntau nyob rau hauv cov tshuaj tiv thaiv, qhov kub thiab txias, siab dua cov tshuaj tiv thaiv. Lwm txoj kev xav yog tias raws li AR Mihailenko's "Nonferrous Metallurgy Rauv" cov ntaub ntawv, cov txheej txheem ntawm magnesium bricks yog muab cov hlau nplaum tuag (cov khoom qis dua 5 hli rau cov hmoov zoo) nrog rau qhov tsim nyog ntawm sulfite pulp pov tseg kua los yog caustic magnesia li A. binder nyob rau hauv xovxwm molding. Muaj pes tsawg leeg ntawm magnesia cib yog: metallurgical magnesia, sulfite pulp pov tseg kua, caustic magnesia. Metallurgical magnesia yog MgO decomposed los ntawm magnesite saum toj no 1600 degree, uas muab faib ua: MgO: 92-93.5%, Fe2O3:1.5-3%, AL2O3:0. {12}}%, CaO: 1-2.5%, SiO2: 2-2.5%. Los ntawm cov ntsiab lus saum toj no, nws tuaj yeem pom tias Fe2O3, AL2O3 thiab SiO2 tsis hydrolysis hauv cov huab cua ntub, thiab MgO yog cov siv lead ua magnesite nrog lub siab melting point (kwv yees li 2500 degree), yog li hydrolysis tsis tshwm sim. Tsuas yog CaO thiab H2O tshwm sim CaO + H2O=Ca (OH) 2, yog li metallurgical magnesia nws tus kheej muaj qee qhov nqus dej. Sulfite daim ntawv slurry yog ib qho polymer viscous colloidal khoom nrog hydrophilic zog, uas ua rau magnesium bricks nqus dej hauv huab cua. Caustic magnesia yog decomposition ntawm magnesite ntawm 800-900 degree raws li MgCO3=MgO + CO2-28900 kcal. Qhov no magnesia yog qhov txawv ntawm qhov kub siab saum toj no 1600 degree tuag hlawv metallurgical magnesia, hydrolysis tshwm sim hauv cov huab cua ntub: MgO + H2OM → Mg (OH) 2 Cov tshuaj tiv thaiv tsuas yog qhia qhov laj thawj vim li cas magnesium cib tshwm sim hauv kev sib ntsib ntawm cov dej noo. thiab dej vapor
Magnesium calcium yog tib tsev neeg, tab sis tib tsev neeg tsis txhais hais tias qhov xwm yog tib yam, qhov xwm ntawm magnesium calcium zoo ib yam, tab sis calcium muaj zog ntau dua li cov khoom kub ntawm magnesium, piv txwv li, calcium tuaj yeem ua rau muaj kev kub ntxhov. dej txias, tab sis magnesium tsuas tuaj yeem cuam tshuam nrog dej kub
