Cov ntaub ntawv refractory rau sab phab ntsa ntawm cov hluav taws xob hluav taws xob zoo tib yam
MgO-C refractory cib feem ntau yog siv los tsim cov phab ntsa ntawm cov hluav taws xob hluav taws xob tsis muaj cov phab ntsa dej txias. Cov chaw kub thiab cov kab slag muaj cov kev pabcuam hnyav tshaj plaws. Lawv tsis tsuas yog hnyav heev corroded thiab eroded los ntawm molten steel thiab slag, raws li zoo raws li heev mechanically cuam tshuam thaum seem ntxiv, tab sis kuj raug rau thermal tawg los ntawm lub arc. Yog li ntawd, cov khoom no tau tsim nrog MgO-C cib nrog kev ua tau zoo heev. Rau sab phab ntsa ntawm cov hluav taws xob furnaces nrog cov phab ntsa dej-txias, vim yog siv cov cuab yeej siv dej txias, cov khoom siv hluav taws xob tau nce ntxiv thiab cov kev siv tau nruj dua. Yog li ntawd, MgO-C bricks nrog zoo slag kuj, thermal poob siab stability thiab siab thermal conductivity yuav tsum tau xaiv. Lawv cov ntsiab lus carbon yog 10% ~ 20%.
Cov ntaub ntawv refractory rau sab phab ntsa ntawm ultra-siab fais fab fais fab
Sab phab ntsa ntawm lub qhov cub hluav taws xob ultra-high fais fab (UHP furnaces) feem ntau yog ua nrog MgO-C refractory cib, thiab cov chaw kub thiab cov kab slag yog tsim nrog MgO-C cib nrog kev ua tau zoo heev (xws li cov pa roj carbon matrix MgO- C cib). Txhim kho nws lub neej ua haujlwm tau zoo.
Txawm hais tias lub cub tawg phab ntsa tau raug txo vim kev txhim kho hauv cov txheej txheem hluav taws xob ua haujlwm, nws tseem nyuaj rau cov ntaub ntawv refractory kom ntev lub neej kev pab cuam ntawm cov kub kub thaum ua haujlwm hauv UHP rauv smelting tej yam kev mob. Yog li ntawd, dej txias tshuab tau tsim thiab siv. Rau qhov cub hluav taws xob siv EBT tapping, qhov chaw txias dej nce mus txog 70%, yog li txo qis kev siv cov khoom siv refractory. Kev siv dej txias niaj hnub xav tau MgO-C cib nrog cov thermal conductivity zoo. Asphalt, resin-bonded magnesia refractory cib thiab MgO-C cib (cov ntsiab lus carbon 5%-25%) yog siv los tsim cov phab ntsa ntawm lub cub hluav taws xob. Nyob rau hauv cov mob hnyav oxidation, cov tshuaj antioxidants ntxiv.
Rau cov chaw hotspot feem ntau raug puas tsuaj los ntawm redox cov tshuaj tiv thaiv, MgO-C bricks nrog loj crystalline fused magnesite li raw khoom, cov ntsiab lus carbon ntau dua 20%, thiab tag nrho cov pa roj carbon matrix yog siv rau kev tsim kho.
MgO-C cib rau UHP hluav taws xob furnaces raug rho tawm haujlwm ntawm qhov kub thiab txias thiab tom qab ntawd impregnated nrog asphalt los tsim cov khoom hu ua raug rho tawm haujlwm asphalt-impregnated MgO-C cib. Piv nrog rau cov cib uas tsis muaj impregnated, cov ntsiab lus ntawm cov khoom seem ntawm MgO-C cib tom qab asphalt impregnation thiab recarbonization nce li ntawm 1%, lub porosity txo los ntawm 1%, thiab lub siab kub flexural zog thiab compressive zog yog ho txhim kho. Yog li ntawd, nws muaj kev ua haujlwm siab durability.
Magnesium refractory cov ntaub ntawv rau hluav taws xob rauv sab phab ntsa
Hluav taws xob rauv hauv ob sab phlu yog muab faib ua alkaline thiab acidic sawv daws yuav. Cov qub siv alkaline refractory cov ntaub ntawv (xws li magnesia thiab MgO-CaO refractory cov ntaub ntawv) raws li lub qhov cub hauv ob sab phlu, thaum tom kawg siv silica refractory bricks, quartz xuab zeb, dawb av, thiab lwm yam.
