Cov kev cai dav dav rau cov khoom siv refractory rau hluav taws xob arc rauv yog:
(1) Lub refractoriness yuav tsum siab. Lub arc kub tshaj 4000 ° C, thiab steelmaking kub yog 1500 ~ 1750 ° C, qee zaum siab li 2000 ° C, yog li cov ntaub ntawv refractory yuav tsum muaj siab refractoriness.
(2) Lub softening kub nyob rau hauv load yuav tsum siab. Lub tshuab hluav taws xob ua haujlwm nyob rau hauv qhov kub thiab txias load, thiab lub tshuab ua kom sov lub cev yuav tsum tiv taus qhov yaig ntawm cov hlau molten, yog li cov khoom siv refractory yuav tsum muaj qhov kub thiab txias.
(3) Lub zog compressive yuav tsum siab. Lub tshuab hluav taws xob hauv ob sab phlu raug cuam tshuam los ntawm kev cuam tshuam ntawm kev them nyiaj thaum lub sijhawm them nyiaj, lub siab zoo li qub ntawm cov hlau molten thaum smelting, kev yaig ntawm cov hlau ntws thaum tapping, thiab txhua yam kev co thaum ua haujlwm. Yog li ntawd, cov khoom siv refractory yuav tsum muaj siab compressive zog.
(4) Lub thermal conductivity yuav tsum me me. Txhawm rau txo qhov kub poob ntawm lub cub hluav taws xob thiab txo qhov kev siv hluav taws xob, cov khoom siv refractory yuav tsum muaj cov thermal conductivity tsis zoo, uas yog, thermal conductivity coefficient yuav tsum me me.
(5) Thermal stability yuav tsum zoo. Tsis pub dhau ob peb feeb los ntawm tapping mus rau them rau hauv hluav taws xob rauv steelmaking, qhov kub thiab txias poob los ntawm ib ncig ntawm 1600 ° C mus rau qis dua 900 ° C, yog li cov ntaub ntawv refractory yuav tsum muaj thermal stability.
(6) Muaj zog corrosion kuj. Thaum lub sij hawm steelmaking txheej txheem, slag, furnace gas thiab molten steel tag nrho cov muaj zog tshuaj yaig los ntawm cov ntaub ntawv refractory, yog li cov ntaub ntawv refractory yuav tsum muaj zoo corrosion kuj.
Xaiv cov khoom siv refractory rau sab phab ntsa
MgO-C 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 corroded hnyav 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 ua nrog MgO-C 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 ntau MgO-C. cib). Txhim kho nws lub neej ua haujlwm tau zoo.
Txawm hais tias lub cub tawg phab ntsa tau raug txo vim yog kev txhim kho hauv cov txheej txheem hluav taws xob ua haujlwm, nws tseem nyuaj rau cov khoom siv refractory kom ntev lub neej kev pab cuam ntawm qhov 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 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.
Kev tsim kho tshiab ntawm MgO-C cib rau UHP hluav taws xob rauv yog siv cov hluav taws kub kub thiab tom qab ntawd impregnation nrog asphalt los tsim cov khoom hu ua hluav taws xob asphalt-impregnated MgO-C cib. Raws li tuaj yeem pom los ntawm Table 2, piv nrog cov cib 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 siab. tsis kam yog Lub zog tau raug txhim kho zoo, yog li nws muaj kev ua haujlwm siab.
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. 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 lub tom kawg siv silica bricks, quartz xuab zeb, dawb av nkos, thiab lwm yam.
Lus Cim: Rau cov khoom siv hluav taws xob hauv cov khoom siv hluav taws xob, cov hluav taws xob alkaline siv cov khoom siv alkaline refractory, thiab cov hluav taws xob hluav taws xob siv cov khoom siv acidic refractory.
Post lub sij hawm: Oct-12-2023
