ferro silicon 75 ua li cas?

Ferro Silicon 75yog tsim los ntawm siab -kub txo nyob rau hauv submerged arc rauv. Cov txheej txheem tseem ceeb suav nrog txo SiO₂ hauv quartz xuab zeb nrog coke thiab seem hlau ntawm 1700-2000℃los tsim cov ferrosilicon alloy:

 Cov tshuaj tiv thaiv tseem ceeb:SiO₂ + 2C → Si + 2CO↑ (ΔG < 0 ntawm qhov kub thiab txias, qhov tshwm sim tshwm sim);

 Cov tshuaj tiv thaiv sab:SiO₂ + 3C → SiC + 2CO↑ (lub qhov cub kub thiab cov khoom siv raw yuav tsum tau tswj nruj me ntsis kom tsis txhob muaj qhov nyuaj thiab nkig SiC theem).

(1) Raw khoom npaj thiab meej proportioning

Raw khoom zoo yog lub hauv paus ntawm FeSi75 kev ua tau zoo. Cov ntaub ntawv tseem ceeb thiab cov kev xav tau yog raws li hauv qab no:

(2) Submerged Arc Rauv Smelting: Siab -Kev txo qis thiab lub zog tswj

Lub submerged arc rauv yog cov khoom siv tseem ceeb rau Ferro Silicon 75% ntau lawm. Cov txheej txheem tseem ceeb yog raws li nram no:

Rauv hom xaiv:

Feem ntau, kaw lossis ib nrab - kaw submerged arc rauv nrog lub peev xwm ntawm 12500kVA lossis siab dua yog siv. Lub qhov cub kaw tuaj yeem txo cov cua sov, thiab lub zog noj ib tuj ntawm cov khoom raug txo los ntawm 10% -15%;

Qhov cub kub tswj:

Qhov kub nyob rau hauv cov tshuaj tiv thaiv cheeb tsam nyob rau hauv lub cub tawg yog khaws cia ntawm 1800-2000 degree. Kev tswj qhov kub thiab txias yog ua tiav los ntawm kev kho cov electrode insertion qhov tob (1.2-1.5m) thiab transformer fais fab (80% -90% ntawm tag nrho cov load);

Hlau Tapping Cycle:

Hlau yog tapping ib zaug txhua 8-12 teev, nrog tapping ntim ntawm 5-8 tons txhua zaus. Tus nqi ntws (0.5-1.0 tons / ton) yuav tsum tau tswj xyuas thaum tapping.

(3) Refining thiab Composition Kho tom qab tapping,

Cov hlau molten yuav tsum tau ua kom zoo dua kom ntseeg tau tias muaj pes tsawg leeg ua tau raws li cov qauv:

Desulfurization:

Thaum cov hlau molten kub yog 1400-1500 degree, ntxiv txiv qaub (CaO Ntau dua lossis sib npaug li 90%) lossis calcium carbide (CaC₂ Ntau dua lossis sib npaug li 80%). Tus nqi desulfurization tuaj yeem ncav cuag 60% -70%, txo cov ntsiab lus S ntawm 0.08% mus rau qis dua 0.03%;

Silicon Cov ntsiab lus hloov kho:

Yog tias cov ntsiab lus ntawm silicon tsawg dhau (<72%), silica (SiO₂≥98%) and coke can be added for secondary reduction in the molten iron ladle, with a silicon recovery rate of about 70%;

Kev tshem tawm impurity:

Los ntawm kev tsim slag (CaO-SiO₂-Al₂O₃ slag system), impurities xws li Al thiab Ca yog adsorbed, txo cov ntsiab lus Al ntawm 1.0% mus rau qis dua 0.5% (yuav tsum tau rau qib FeSi75-Al0.5).

(4) Casting thiab tiav cov khoom ua tiav

Casting:

Molten hlau yog poured rau hauv pwm (cam khwb cia hlau los yog hlau pwm) thiab tso cai rau txias lawm nyob rau hauv chav tsev kub los tsim ferrosilicon blocks;

Crushing thiab tshuaj ntsuam:

Cov ferrosilicon blocks yog crushed mus rau ib tug particle loj ntawm 5-100mm thiab graded siv lub vibrating screen kom tshem tawm cov hmoov thiab oversized hais;

Kev soj ntsuam zoo:

Lub spectrometer yog siv los kuaj xyuas qhov muaj pes tsawg leeg ntawm Si, Fe, Al, S, thiab P, kom ntseeg tau tias Si 72% -80%, Al Tsawg dua lossis sib npaug rau 0.5%, S Tsawg dua lossis sib npaug li 0.05%, thiab P Tsawg dua lossis sib npaug rau 0.04% (ua tau raws li qhov yuav tsum tau ua ntawm GB / T 2272-Si575).

(1) Kev txuag hluav taws xob thiab kev siv hluav taws xob txo qis

Kev siv "khoom siv hluav taws xob pov tseg" kom rov qab tau cov khoom pov tseg los ntawm cov roj hluav taws xob ntawm lub qhov cub submerged arc (kub 800-1000 degree) rau preheating raw cov ntaub ntawv los yog lub zog tsim hluav taws xob, txo lub zog noj ib tuj ntawm cov khoom ntawm 8500kWh txog 7500kWh;

Optimizing electrode paste formula kom txo tau electrode noj, txo electrode noj ib tuj ntawm cov khoom los ntawm 25kg mus rau hauv qab 20kg.

(2) Kev tswj cov khoom tsis zoo

If the Si content is too high (>80%), qhov kev faib ua feem ntawm cov khoom seem tuaj yeem nce ntxiv hauv cov khoom siv tom ntej (rau txhua txhua 0.5% nce hauv cov khoom seem, Si cov ntsiab lus txo los ntawm kwv yees li 1%);

Yog tias cov ntsiab lus Al tshaj li tus qauv, siab -purity quartz xuab zeb (Al₂O₃ Tsawg dua lossis sib npaug li 0.3%) yuav tsum tau hloov, thiab cov slag hauv paus (CaO/SiO₂=1.2-1.5) yuav tsum tau kho kom txhim kho slag adsorption muaj peev xwm.

(3) Kev Tiv Thaiv Ib puag ncig thiab Kev Tswj Xyuas Kev Nyab Xeeb

Kev tshem tawm cov plua plav qhuav ua ke thiab cov txheej txheem ntub dej desulfurization tau txais yuav, txo cov plua plav concentration hauv cov pa roj los ntawm 500 mg / m³ mus rau qis dua 10 mg / m³, thiab SO₂ emission concentration rau<50 mg/m³, meeting environmental protection requirements.

High-cov hnab looj tes tiv thaiv kub thiab tsom iav yuav tsum hnav thaum lub tshuab ua haujlwm kub. Kev nyab xeeb nyob deb yuav tsum tau tswj xyuas thaum tapping molten hlau kom tsis txhob kub hnyiab ntawm cov hlau molten.

 Loj dua - nplai thiab Kev Tsim Kho Txawj Ntse:Cov dej num tshiab tau nce ntxiv rau cov khoom siv hluav taws xob submerged arc ntawm 30,000 kVA lossis siab dua, nruab nrog DCS tswj cov tshuab kom ua tiav kev tswj hwm ntawm lub cub tawg kub, electrodes, thiab tapping, nce ntau lawm efficiency los ntawm 20% -30%;
 Ntsuab thiab qis-Kev hloov pauv carbon:Tshawb nrhiav "ntsuab hluav taws xob + ntsuab coke" cov txheej txheem, siv hluav taws xob txuas ntxiv hluav taws xob thiab biomass coke kom txo cov pa roj carbon emissions ib tuj ntawm cov khoom ntau dua 50%, ua raws li lub ntiaj teb sib txawv ntawm carbon neutrality;
 High -End Development:Kev tsim kho, qis -sulfurqis- aluminium Ferro Silicon 75(Al Tsawg dua lossis sib npaug rau 0.3%, S Tsawg dua lossis sib npaug li 0.03%) kom ua tau raws li qhov xav tau nruj ntawm siab -kawg steel thiab precision casting, nce cov khoom hwm ntawm 15%-20%.