Ntxiv me me ntawm silicon carbide (SiC) thaum smelting ferrosilicon tuaj yeem txuag tau qee lub zog hluav taws xob. Cov "silicon carbide" hais txog ntawm no tsis yog cov khoom siv tshwj xeeb, tab sis cov khoom siv hluav taws xob thermal pov tseg ntawm graphitization rauv thaum tsim graphite electrodes. Nws muaj ntau ntawm silicon carbide, yog li nws yog kev cai hu rau cov khib nyiab no "silicon carbide".
Nws cov khoom xyaw yog raws li nram no:
SiC25 ~ 40%; SiO220%; C 25%; tus so yog Al2O3 thiab CaO, thiab lwm yam. Yog vim li cas ntxiv me me ntawm "silicon carbide" thaum lub sij hawm smelting yuav txo tau hwj chim noj.
Thaum smelting ferrosilicon, qhov txo ntawm silicon dioxide yog cov tshuaj tiv thaiv uas absorbs ib tug loj npaum li cas ntawm tshav kub zog. Yog li ntawd, cov tshuaj tiv thaiv yuav tsum tau ua kom nruj heev ntawm qhov kub thiab txias (kwv yees li 1800 txog 1900 degree), yog li siv hluav taws xob ntau. Thaum ib feem ntawm silicon carbide ntxiv rau tus nqi, nws reacts nrog steel scraps nyob rau hauv tus nqi raws li nram no nyob rau hauv lub cub tawg:
SiC＋Fe= FeSi＋C
Cov tshuaj tiv thaiv no yog cov tshuaj tiv thaiv endothermic, thiab cov cua sov absorbed thiab cov tshuaj tiv thaiv kub yog qis dua li qhov yuav tsum tau ua rau txo cov silicon dioxide. Yog li ntawd, ntxiv ib feem ntawm silicon carbide rau lub cub tawg yuav txo tau lub zog noj.
Nyob rau hauv smelting 45 ferrosilicon, vim muaj ntau ntawm steel scraps nyob rau hauv tus nqi, kev puas tsuaj cov tshuaj tiv thaiv ntawm silicon carbide mas yog ua raws li SiC + Fe=FeSi + C. Yog li ntawd, qhov kev siv ntawm silicon carbide yog siab dua nyob rau lub sijhawm no.
Thaum smelting 75 ferrosilicon, muaj tsawg steel scraps thiab ntau silica nyob rau hauv tus nqi. Kev puas tsuaj cov tshuaj tiv thaiv ntawm silicon carbide feem ntau yuav ua raws li hauv qab no:
2SiO2＋SiC= 3SiO＋CO↑
SiO＋SiC=2Si＋CO↑
Ob qhov kev tshwm sim yog ua tiav ntawm qhov kub siab tshaj li ntawm 1800 degree, thiab roj SiO koom nrog cov tshuaj tiv thaiv. Txij li thaum gaseous SiO yog ntau volatile, cov tshuaj tiv thaiv uas rhuav tshem silicon carbide tsis tuaj yeem nqa tawm yam xyuam xim. Nws tuaj yeem pom tias thaum smelting 75 ferrosilicon, qhov kev siv ntawm silicon carbide tsawg.
Xyaum tau ua pov thawj tias thaum smelting 45 ferrosilicon nyob rau hauv ib tug loj-muaj peev xwm submerged arc rauv, ntxiv ib feem ntawm silicon carbide muaj ib tug tseem ceeb nyhuv. Thaum smelting 75 ferrosilicon, qee qhov silicon carbide ntxiv, tab sis cov nyhuv tsis tseem ceeb.
Silicon carbide muaj lub siab melting point thiab muaj zog hluav taws xob conductivity. Tom qab ntxiv cov silicon reinforced thaum lub sij hawm smelting, cov electrode tsis yooj yim rau stabilize thiab cov cua sov tej yam kev mob yog nyuaj rau tswj. Ntxiv mus, muaj ntau ntawm silicon carbide hmoov, uas cuam tshuam rau huab cua permeability ntawm cov khoom nto thiab qee zaum ua rau muaj teeb meem loj. Vim li no, nws tsis yooj yim rau ntxiv silicon carbide ntau dhau thaum smelting, thiab silicon carbide siv yuav tsum tau ua tib zoo xaiv los txo cov hmoov.
Kev paub dhau los tau ua pov thawj tias thaum smelting 45 ferrosilicon, 50 mus rau 70 kilograms ntawm silicon carbide tuaj yeem muab ntxiv rau txhua pawg ntawm cov khoom (silica yog xam raws li 300 kilograms); Thaum smelting 75 ferrosilicon, nws yog tsim nyog los ntxiv 20 mus rau 30 kilograms rau txhua batch ntawm cov khoom.
