Qhov kev nthuav tawm cuam tshuam txog ib txoj hauv kev ntawm kev ua kom cov pa roj carbon hauv qab ntawm qhov cub tawg lub sijhawm smelting ntawm silicon hlau
Hauv cov txheej txheem ntawm hluav taws xob ua kom sov ntawm cov hlau nplaum, cov khoom siv sib xyaw yog thawj cov txheej txheem, cov pa roj carbon ntau siv nyob rau hauv txhua qhov cuam tshuam ncaj qha rau kev lag luam thiab ntsuas cov ntsiab lus ntawm txhua theem, thiab kev noj cov pa roj carbon monoxide yog kev tswj ntsuas qhov tseem ceeb hauv cov txheej txheem ntawm hluav taws xob cua sov smelting ntawm silicon hlau. Thaum muaj cov pa roj carbon tsis txaus nyob rau hauv lub cub tawg, silica tsis tuaj yeem raug txo qis, thiab ntau dhau ntawm cov kua roj silica tsim cov ntau ntawm silicon monoxide hauv cov cub tawg. Ib feem ntawm cov ntau tshaj ntawm silicon dioxide ua kua thiab slagged ua ke nrog impurities hauv cov khoom siv raw, ua rau cov cua sov hloov. Thaum muaj cov pa roj carbon ntau hauv qhov cub tawg, silicon carbide yuav tsim nyob rau hauv lub cub tawg, uas ntab hauv oxides ntawm silicon hlau txhawm rau txhim kho viscosity ntawm yaj, uas ua rau lub cub tawg slag yog qhov nyuaj rau tshem tawm ntawm lub cub tawg, cov pa roj carbon ntau yuav tseem txhim kho qhov kub uas tsis muaj conductivity ntawm lub luag haujlwm thiab txo qhov ua haujlwm tsis kam, uas ua rau cov electrode lifting. Hauv cov txheej txheem ntau lawm, silicon hlau rauv taws smelting rauv taws ua tiav cov txheej txheem muaj peev xwm muab faib ua cov chaw hauv qab no: (1) qhov nruab nrab tsis tshua muaj siab txias cheeb tsam (qis dua 1100 ° C) hauv qhov kub ua rau cov pa roj, kom khiav tawm ntawm cov khoom saum npoo ntawm cov SiO sib cuag nrog oxygen hauv huab cua, cov tshuaj tiv thaiv hauv qab no Si 1/2 = 0 {{12}} SiO2 (1) hauv 1100 ° C lub SiO tsis ruaj khov, kuj yuav ua rau cov tshuaj tiv thaiv 2 si0 = Si02 {{13}} Si (2) tab sis kev ua ub no hauv kev txo tus neeg sawv cev rau saum npoo, Muab qhov muaj feem thib rau cov tshuaj tiv thaiv hauv qab no SiO {{28}} C = SiC {{29}} CO (3) (2) tsim lub cheeb tsam SiC (1100, 1800 °) C), cov tshuaj tiv thaiv (3) los ntawm 1100 ° C tau ua tiav kev sib zog ntau dua, txog 1537 ° C, tuaj yeem nqa tawm hauv qhov tshwm sim tshwm sim hauv qab no Si02 + 3 C = SiC + 20 (4) thiab (3) los tsim cov yaj silicon thaj chaw (siab tshaj 1400 ° C), thaum kwv yees li 1400 ° C silicon melting (piv txwv li, ua kom qis dua melting taw tes ntawm Si - Fe alloy), tom qab ntau tshaj li qhov ntshiab melting point, SiO cov tshuaj tiv thaiv carbon, Si S iO+C = Si+C0 Los ntawm 1650 ° C, cov tshuaj tiv thaiv hauv qab no yuav mus rau sab xis rau Si02+2SiC = 3Si+2C0) SiC decomposition thaj tsam (siab tshaj 1800 ° C), thiab cov tshuaj tiv thaiv hauv qab no yuav pib rau sab xis rau Si02 +2SiC = 3Si+2C0 ntawm qhov kub siab tshaj, vim tias cov tshuaj tiv thaiv ntawm SiC thiab SiO, qhov kev txiav tawm yuav ua rau muaj silicon thiab carbon monoxide. (5) SiO qhov chaw evaporation (siab tshaj 2000 ° C), los ntawm 1750 ° C, cov tshuaj tiv thaiv rau txoj cai ntawm cov cai hauv qab no Si02 + C = Si0 + C0 hnub no thaum cov khoom xyaw thaum los ntawm kev tshawb xav ua ke nrog cov kev ua tau zoo hauv cov pa roj carbon monoxide txaus, tab sis vim poob ntawm qhov reductant hauv qhov tsis tshua muaj qhov kub thiab txias tshuaj tiv thaiv cheeb tsam yog ntau dua, feem ntau ntawm tus neeg sawv cev txo qis ua ntej nkag mus rau lub cim ntawm thaj chaw yaj ua ntej cov tshuaj tiv thaiv, nkag mus rau hauv cov khoom ua kua silicon yaj qhov chaw txo qis qis, qhov cub tawg hauv qab vim yog tsis muaj hluav ncaig. , lub cub tawg ntev ntev hauv qab tsis muaj hluav ncaig, qhov ntau ntawm cov kua roj silica yog tsim tom qab melting viscous slag, tsis yooj yim rau kev tshem tawm, yuav ua rau lub cub tawg hauv qab nce, electrode ntxig tsis yooj yim, huab cua permeability ntawm cov khoom saum npoo tsis zoo, uas ncaj qha cuam tshuam rau ntau lawm.
