Cov khoom siv refractory feem ntau yog magnesite nyob rau hauv lub qhov cub cua sov

Cov khoom siv refractory feem ntau yog magnesite nyob rau hauv lub qhov cub cua sov

Qhov feem pua ​​​​ntawm silica bricks nyob rau hauv tag nrho cov nyiaj ntawm ntau yam refractory cib yog kwv yees li 3-7%. Nyob rau ntawm qhov hluav taws kub tsis tu ncua, nws yog siv los tsim lub qhov cub hluav taws xob, qee zaum tsuas yog cov cua kub cua kub thiab cov cua kub tsis sib xws, thiab ntu preheating tseem ua nrog cib. Qhov nruab nrab ntawm lub qhov dej ntub dej siv rau lub tsev rauv phab ntsa tsis haum rau kev siv silica bricks vim nws qhov siab load softening point, hnyav kub hloov nyob rau hauv lub qhov cub lub qhov ncauj, thiab susceptibility rau alkaline slag corrosion nyob rau hauv qab ntawm lub cub tawg. Silicon bricks kuj tseem siv los tsim cov phiajcim cib nyob rau sab sauv txheej ntawm cov khoom cua sov.

Magnesia cib

Magnesia bricks yog cov ntaub ntawv refractory nrog MgO cov ntsiab lus ntawm ntau tshaj 80-85%, feem ntau yog tsim los ntawm periclase ua thawj cov pob zeb hauv av. Cov khoom siv tseem ceeb rau magnesium bricks yog magnesite, nws cov khoom tseem ceeb yog MgC03. Tom qab kub-kub calcination, nws dhau los ua sintered magnesite, uas yog ces crushed mus rau ib tug tej yam me me ua ntej ua sintered magnesia xuab zeb (tseem hu ua metallurgical magnesia xuab zeb). Magnesia yog dav siv los ua cov khoom siv kho cua sov thiab cov khoom siv ramming. Magnesia nrog cov impurities tsawg yog siv los ua cov khoom siv raw rau kev ua magnesia cib. Lub peev txheej ntuj ntawm magnesite tsis muaj ntau, thiab Tuam Tshoj txoj kev khaws cia thiab cov nqi tso tawm yog nyob rau sab saum toj hauv ntiaj teb. Ntau lub teb chaws tsis muaj magnesite cia siab rau kev tsim cov magnesia xuab zeb los ntawm seawater, uas ua rau cov nqi siab.

Magnesia bricks tuaj yeem muab faib ua ob hom raws li lawv cov thev naus laus zis ntau lawm: sintered magnesia cib thiab chemically bonded magnesia bricks. Sintered magnesia cib yog tsim los ntawm kev siv magnesia xuab zeb nrog qhov tsim nyog qhov loj me piv los ntawm kev tua hluav taws tuag, sib xyaw nrog brine (MgCl2 aqueous tov) thiab sulfite pulp pov tseg ua cov ntaub ntawv, thiab nias rau daim ntawv. Nws raug rho tawm haujlwm ntawm qhov kub siab ntawm 1550-1650 degree . Thaum lub sij hawm tua hluav taws, impurities thiab cov neeg koom nyob rau hauv magnesite tsim ib theem ua kua, uas khi cov periclase ua ke. Txawm li cas los xij, chemically bonded magnesia bricks tsis mus txog qhov kev tua hluav taws. Tom qab sintering magnesia xuab zeb raws li nws cov particle loj piv, tsim nyog mineralizers thiab binders ntxiv rau txwv txoj kev molding, thiab cov khoom tiav yog tau los ntawm kev ziab.

Chemical bonded magnesia bricks muaj lub zog qis dua thiab ua haujlwm tsawg dua li sintered magnesia bricks, tab sis lawv pheej yig dua thiab tsawg dua ib nrab ntawm tus nqi ntawm sintered magnesia bricks. Nws yog siv rau hauv cov cheeb tsam uas tsis tshua muaj kev ua haujlwm, xws li hauv qab ntawm cov cua sov rauv taws thiab cov qhov dej ntub dej. Magnesium bricks belongs rau alkaline refractory cov ntaub ntawv thiab muaj zog tiv thaiv alkaline slag, tab sis tsis tuaj yeem tiv thaiv corrosion 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 melting point ntawm MgO yog siab li 2800 degree, thiab qhov hluav taws kub kuj ntawm magnesium bricks yog siab tshaj 2000 degree, tab sis lawv load softening point yog tsawg heev, tsuas yog nyob nruab nrab ntawm 1500-1550 degree. Qhov no yog vim hais tias cov crystallization ntawm periclase yog bonded los ntawm tsawg melting point calcium magnesium olivine (CaO · MgO · SiO2) thiab iav theem, thiab periclase tsis tsim ib tug nruam siv lead ua network. Qhov kub ntawm load deformation yog tsawg heev, thiab qhov deb ntawm qhov pib softening mus rau 40% deformation kub yog tsawg heev, tsuas yog 30-50 degree . Lub thermal stability ntawm magnesium bricks kuj tsis zoo, nrog yooj yim tawg thaum lub sij hawm ceev ceev txias thiab cua sov, uas yog lub hauv paus ua rau puas magnesium bricks.

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