Lub luag haujlwm tseem ceeb thaum lub sijhawm EAF steelmaking oxidation
1. Ntxiv dephosphorization. Xav txog qhov muaj peev xwm ntawm phosphorus rov qab thaum lub sij hawm txo qis, nws yuav tsum tswj P ntawm qib ntawm<0.010% during the oxidation period.
2. Tshem tawm cov pa roj thiab impurities. Qhov yuav tsum tau ua kom tiav oxidation yog H<0.0035% and N<0.007%.
3. Cov cua kub thiab qhov kub tsis sib xws ntawm cov hlau molten. Thaum kawg ntawm oxidation, qhov kub ntawm 10-20 degree siab tshaj qhov kub ntawm tapping yog yuav tsum tau los tsim tej yam kev mob rau slag tsim thiab alloying thaum lub sij hawm txo.
4. Tswj cov ntsiab lus carbon hauv cov hlau. Xav txog qhov deoxidation thaum lub sij hawm txo qis thiab electrode carbonization, lub sij hawm oxidation yuav tsum tau C cov ntsiab lus yog 0.03 ~ 0.08% qis dua qhov qis qis yuav tsum tau rau qib steel.
Dephosphorization
Muaj txiaj ntsig zoo rau dephosphorization: qhov kub thiab txias, siab oxidation, siab alkalinity, loj slag ntim.
Decarbonization
Lub oxidation thiab decarbonization ntawm hluav taws xob arc rauv tsis yog lub hom phiaj, tab sis yog ib qho txhais tau tias ntawm boiling lub pas dej ua ke molten thiab tshem tawm cov pa phem thiab impurities los ntawm cov hlau, thiaj li ua tiav lub hom phiaj ntawm kev ntxuav cov hlau molten. Cov pa roj carbon monoxide boiling thiab degassing tuaj yeem nkag siab zoo li cov tshuaj tiv thaiv decarbonization tsim ntau cov pa npuas CO, uas ntab rau ntawm cov hlau molten. Hauv CO npuas, ib nrab siab ntawm nitrogen thiab hydrogen yog xoom, sib npaug rau lub tshuab nqus tsev me me, yog li ua tiav lub hom phiaj ntawm degassing.
Cov pa roj oxygen rau hauv cov pas dej Molly tuaj yeem kho tau sai sai rau hauv cov npuas tuab, thiab cov me dua cov npuas tsim hauv cov hlau Molten. Cov npuas npuas tuaj yeem raug oxidation ncaj qha nrog [C] hauv cov hlau, nrog rau kev tsis ncaj oxidation tshwm sim nrog [C].
Direct oxidation: [C] +1/2 {O2} → CO
Indirect oxidation: [Fe] {{0}}/2 {O2} → [Fe0]
[FeO]+[C] →>CO + [Fe]
Hauv qhov cub hluav taws xob hluav taws xob, qhov decarburization feem ntau tuaj yeem ncav cuag {{0}}.025-0.050% / min, tab sis thaum cov ntsiab lus carbon qis dua 0.2-0.3%. , cov ntsiab lus carbon tsawg thiab decarburization tus nqi poob sharply.