Refractory Magnesia Cib

Magnesia bricks muab faib ua magnesia bricks thiab unfired magnesia bricks. Burned magnesia bricks muab faib ua silicate bonded magnesia cib, ncaj qha sib txuas magnesia cib thiab rebonded magnesia cib. Unfired magnesia bricks tau muab faib ua chemical bonded magnesia bricks thiab asphalt bonded magnesia bricks.

Cov khoom siv raw ntawm magnesia cib feem ntau yog magnesite, thiab nws cov khoom tseem ceeb yog MgCO3. Tom qab calcined ntawm qhov kub thiab txias thiab ces crushed mus rau ib tug tej yam particle loj, nws yuav sintered magnesia. Magnesia feem ntau yog siv los ua cov khoom siv kho cua sov thiab cov khoom siv ramming. Magnesia nrog ob peb impurities (ω (CaO)<2.5%, ω (SiO2) <3.5%) is used as a raw material for making magnesia bricks.

Magnesia bricks tau muab faib ua ob hom: sintered magnesia bricks thiab chemically bonded magnesia bricks raws li lawv cov txheej txheem ntau lawm. Sintered magnesia bricks yog ua los ntawm cov tuag- raug rho tawm magnesia nrog qhov loj me me piv, ntxiv brine (MgCl2 aqueous tov) thiab sulfurous acid pulp khib kua ua cov khoom siv khi, pressurizing thiab molding, thiab tua ntawm qhov kub ntawm 1550 ~ 1650 degree. Chemically bonded magnesia bricks tsis mus los ntawm cov txheej txheem firing. Tom qab sib tov cov sintered magnesia raws li qhov sib piv me me, ntxiv qhov tsim nyog ntawm cov mineralizer thiab khi tus neeg sawv cev, nias thiab cov duab, thiab tom qab ntawd qhuav cov khoom tiav. Chemically bonded magnesia bricks muaj qis zog thiab kev ua tau zoo tshaj sintered magnesia bricks, tab sis lawv yog pheej yig dua, tsawg tshaj li ib nrab ntawm sintered magnesia bricks. Nws yog siv nyob rau hauv qhov chaw uas tsis tshua xav tau kev ua tau zoo, xws li cov cua sov rauv thiab cov cua sov hauv qab.

Magnesia bricks yog alkaline refractory cov ntaub ntawv uas muaj zog tiv thaiv alkaline slag, tab sis tsis tuaj yeem tiv taus qhov yaig ntawm acidic slag. Ntawm qhov kub ntawm 1600 degree, lawv tuaj yeem hnov ​​​​mob thaum sib cuag nrog silica cib, av nplaum cib thiab txawm tias siab alumina cib. Lub refractoriness ntawm magnesia bricks yog siab tshaj 2000 degree, tab sis nws load softening point tsuas yog 1500 ~ 1550 degree. Ntxiv mus, lub sijhawm kub ntawm qhov muag mus rau 40% deformation yog me me, tsuas yog 30 ~ 50 degree. Lub thermal stability ntawm magnesia bricks kuj tsis zoo, uas yog ib qho tseem ceeb rau kev puas tsuaj ntawm magnesia bricks.

Hauv cov cua kub cua sov thiab cov cua sov, cov khoom siv magnesia feem ntau yog siv los ua kom lub qhov cub hauv qab txheej txheej thiab sab hauv qab ntawm phab ntsa ntub dej. Nws tuaj yeem tiv taus qhov yaig ntawm hlau oxide nplai.

Lub refractoriness ntawm magnesia bricks tuaj yeem ncav cuag ntau tshaj 2000 degree, thiab nws cov load softening kub nws txawv heev nrog lub melting point ntawm lub cementing theem thiab tus nqi ntawm cov kua theem ua nyob rau hauv high kub. Feem ntau, lub load softening pib kub ntawm magnesia bricks yog nyob nruab nrab ntawm 1520 thiab 1600 degree, thaum siab -purity magnesia bricks tuaj yeem ncav cuag 1800℃. Lub load softening pib kub ntawm magnesia bricks tsis ntau txawv los ntawm lub cev qhuav dej kub. Lub linear expansion tus nqi ntawm magnesia bricks ntawm 20 ~ 1000℃yog feem ntau 1.2% ~ 1.4%, thiab yog kwv yees li linear. Thaum cov kua theem tshwm nyob rau hauv lub cib ntawm qhov kub thiab txias, sai li sai tau shrinkage tshwm sim. Lub thermal conductivity ntawm magnesia bricks yog siab, thib ob tsuas yog carbon cib thiab silicon carbide cib ntawm cov khoom refractory, thiab nws txo qis thaum kub nce. Lub thermal shock tsis kam ntawm magnesia bricks tsis zoo. Txhim kho qhov purity ntawm magnesia cib tuaj yeem txhim kho cov thermal poob siab. Magnesia bricks muaj kev tiv thaiv tsis zoo rau acidic slag. Lawv tsis tuaj yeem tiv tauj ncaj qha nrog silica bricks thaum siv. Cov cib nruab nrab feem ntau yog siv los cais lawv. Lub conductivity ntawm magnesia bricks nyob rau hauv ib txwm kub yog tsawg heev, tab sis nws yuav tsis raug ignored nyob rau hauv high kub (xws li 1500 degree). Yog tias nws siv rau hauv qab ntawm lub qhov cub hluav taws xob, yuav tsum tau them nyiaj mloog.

Magnesia raw cov ntaub ntawv yog crushed rau hauv granular cov ntaub ntawv thiab hmoov. Tom qab sib xyaw ua ke raws li ib qho piv txwv, tus neeg sawv cev sib txuas ntxiv txhawm rau txhawm rau cov av nplaum rau hauv av, thiab tom qab ntawd cov hluav taws kub nyhiab magnesia tau ua rau raug rho tawm haujlwm magnesia bricks los ntawm cov txheej txheem xws li shaping, ziab, thiab tua. Qhov hluav taws kub kub ntawm qhov zoo tib yam magnesia bricks feem ntau yog 1500 ~ 1650 degree, thaum qhov hluav taws kub kub ntawm siab -purity magnesia bricks yog siab li 1700 ~ 1900℃. Cov txheej txheem tsim khoom ntawm cov tshuaj sib xyaw ua ke magnesia cib yog qhov zoo ib yam, tshwj tsis yog tias nws tau ua ke nrog cov tshuaj binders tsis muaj siab - kub kub, thiab tsuas yog yuav tsum muaj qhov tsim nyog qis -kub kub kho kom tsis txhob hlawv magnesia cib.

Lus Cim: Magnesia bricks muaj dej tsis zoo thiab yooj yim hydrated thaum raug dej, ua rau tawg thiab txo lawv lub zog. Yog li ntawd, xyuam xim rau cov dej noo, nag thiab daus thaum khaws cia thiab thauj.