Electric arc rauv smelting txheej txheem
Cov txheej txheem oxidation smelting ib txwm yog lub hauv paus ntawm EAF steelmaking, thiab cov txheej txheem tseem ceeb suav nrog tsib theem: them, melting, oxidizing, txo, thiab tapping; Nyob rau hauv tus txheej txheem ntawm EAF steelmaking, peb theem ntawm melting, oxidizing, thiab txo tam sim no feem ntau hu ua "laus thib peb theem".
1. Kev them nyiaj yug
Cov ntaub ntawv tseem ceeb siv nyob rau hauv hluav taws xob arc rauv yog cov khoom seem, cov khoom xa rov qab, thiab cov carburizers, nrog rau qee qhov DRI, npua hlau (los yog hlau molten), thiab cov ntaub ntawv alloy; Tam sim no, txoj hauv kev tseem ceeb ntawm kev them nyiaj yog siv lub tshuab hluav taws xob sab saum toj them lub tank (lossis them pob tawb, silos), thiab txhua qhov cub hluav taws xob tau ntxiv rau hauv 1-3 batch.
Qhov zoo ntawm cov khoom siv them nyiaj cuam tshuam rau lub neej kev pab cuam ntawm lub qhov cub hauv ob sab phlu, smelting lub sij hawm, kev siv hluav taws xob, kev siv hluav taws xob, thiab kev kub hnyiab ntawm cov ntsiab lus alloy; Cov kev paub ntawm qhov chaw ntawm cov nqi faib khoom yog: ntom rau hauv qab, xoob ntawm sab saum toj, siab hauv nruab nrab, thiab qis ib puag ncig. Tsis muaj cov blocks loj ntawm qhov nkag ntawm lub qhov cub, nws tuaj yeem nkag mus rau qhov dej sai sai yam tsis muaj kev txuas, yaj sai, thiab muaj kev ua haujlwm siab.
2. Lub sijhawm yaj
Tom qab kev thauj khoom tiav thiab cov cuab yeej tau lees paub tias yuav ua haujlwm tau, lub sijhawm melting pib thaum lub hwj chim qhib. Lub sij hawm melting xaus thaum cov khoom siv hauv lub cub tawg yog melted thiab cov hlau molten yog rhuab mus rau qhov kub uas yuav tsum tau rau ore ntxiv los yog oxygen tshuab.
Lub sij hawm melting suav txog li 50-70% ntawm EAF smelting lub sij hawm, thiab cov hluav taws xob siv nyiaj li ntawm 60-80%. Lub luag haujlwm tseem ceeb ntawm lub sijhawm melting yog kom yaj cov khoom siv hluav taws xob sai sai rau hauv cov kua ua kua, tsim cov slag melting ua ntej kom stabilize lub arc, txo qhov nqus ntawm molten steel thiab volatilization ntawm hlau.
3. Lub ntsiab physicochemical cov tshuaj tiv thaiv thaum lub sij hawm melting
Lub arc cua sov qhov chaw yog concentrated, thiab qhov kub ntawm lub arc kem tuaj yeem ncav cuag 300-6000 degree, deb tshaj qhov kub ntawm qee cov hlau. Yog li ntawd, lub ntsiab volatilization tshwm sim nyob rau hauv arc cheeb tsam thaum tus nqi melts. Yog li ntawd, ua kom zoo melting slag yog ib qho tseem ceeb heev rau txo cov volatilization ntawm hlau.
