Ua rau corrosion ntawm hluav taws xob rauv hauv ob sab phlu thaum siv ib txwm
Thaum lub sij hawm ib txwm smelting, lub qhov cub hauv ob sab phlu yog nyob rau hauv kev sib cuag nrog high-temperature molten steel thiab slag, thiab cov kev ua hauj lwm yog hnyav heev. Yog vim li cas rau furnace lining puas yog:
(1) Thermal spalling tshwm sim los ntawm arc hluav taws xob thiab tshuaj lom neeg yaig ntawm qhov kub siab.
(2) Cov nyhuv scouring ntawm molten slag, molten steel thiab rauv roj rau ntawm lub qhov cub hauv ob sab phlu.
(3) Tshuaj yaig ntawm lub qhov cub hauv ob sab phlu los ntawm molten slag.
(4) Peeling tshwm sim los ntawm kev hloov kub.
(5) Cracking tshwm sim los ntawm decomposition ntawm cov ntxhia muaj pes tsawg leeg ntawm lub cub tawg cib nws tus kheej.
(6) Kev sib tsoo tshuab thiab yaig ntawm lub qhov cub hauv ob sab phlu thaum ntxiv cov khoom seem thiab ntxiv cov hlau molten.
Cov txheej txheem yaig ntawmMagnesia carbon cibs thaum lub sij hawm hluav taws xob rauv smelting
Magnesia-carbon bricks yog ua los ntawm cov tuag-hlwb magnesia los yog fused magnesia thiab cov ntaub ntawv carbon (feem ntau yog tag nrho crystallized graphite), npaj thiab pressurized nrog cob raws li ib tug khi, thiab tsim tom qab kev kho cua sov. Txhawm rau txhim kho oxidation tsis kam, hlau lossis lwm yam tshuaj tiv thaiv kab mob feem ntau ntxiv rau magnesite carbon cib.
Cov txheej txheem tseem ceeb ntawm magnesium carbon cib yaig thaum siv hluav taws xob rauv yog:
(1) Magnesia carbon bricks muab faib ua peb txheej tom qab cov tshuaj tiv thaiv: thawj cib txheej (lub cib lub cev uas tsis tau reacted) - decarburization txheej (lub internal MgO thiab carbon undergo ib tug self-consumption cov tshuaj tiv thaiv) - tuab txheej (ib feem ntawm kev sib cuag. nrog steel slag).
(2) Cov MgO thiab cov pa roj carbon monoxide hauv magnesite carbon cib tau txais kev siv tus kheej ntawm qhov kub thiab txias:
MgO+C=Mg+CO
Mg+[O]=MgO
(3) Cov oxides hauv cov slag teb ncaj qha: (Fe2O3) + C cib hauv slag=2(FeO) + {CO}
Magnesium oxide yog txo rau magnesium gas thiab migrate raws lub pores ntawm cov khoom refractory mus rau qhov chaw uas nws yog theem nrab oxidized rau MgO, thiab tsim ib tug high-viscosity petrographic qauv nrog rau lwm yam impurity ntsiab nyob rau hauv nruab nrab ntawm cov magnesia carbon cib, uas yog. feem ntau hu ua ib txheej tuab. Cov txheej txheem yaig yog raws li nram no:
(1) Lub cev hnav thiab tsim kua muag.
Thaum lub sij hawm tshuab ntawm lub converter, lub zog ntawm lub cev steel slag rauv gas ua rau lub cev thiab txhua yam hnav ntawm cov qauv petrographic tev tawm thiab nkag mus rau hauv slag.
(2) Tshuaj tua kab mob.
Cov tshuaj tiv thaiv yog tias ntau yam khoom nyob hauv nruab nrab ntawm cov slag yuav hnov mob nrog cov txheej tuab ntawm cov cib. FeO tuaj yeem txhawb kev sib cais thiab hloov pauv ntawm magnesia mus rau nruab nrab ntawm cov slag thiab ua rau kom muaj kev yaig ntawm magnesia carbon cib.
(3) Cov nyhuv ntawm qhov kub thiab txias ntawm kev yaig.
Qhov siab dua qhov kub, qhov viscosity ntawm steel slag txo qis, lub cev erosion intensifies, thiab decarburization txheej tob, ua rau erosion intensify.
Qhov poob mechanism ntawm magnesia carbon bricks lined nrog hluav taws xob furnaces
Feem ntau, mag carbon bricks yog ua los ntawm high-zoo magnesia nrog high-purity graphite, silicon, silicon carbide thiab lwm yam additives, thiab yog nias nrog phenolic resin raws li ib tug binder. Cov kev cai yooj yim rau magnesite carbon bricks rau hluav taws xob furnaces yog:
(1) Lub thermal conductivity yog tsawg kom ntseeg tau tias tsis tshua muaj cua sov thiab txhim kho thermal efficiency ntawm lub cub hluav taws xob;
(2) Kev ua haujlwm siab rau thermochemical thiab thermophysical corrosion coefficients, uas yuav tsum tau muaj kev ruaj ntseg zoo;
(3) Kev tiv thaiv rau slag, tev, oxidation thiab siab compressive zog, uas ua rau tsawg noj thiab lub neej ntev.
Thaum ci lub tshuab hluav taws xob tshiab, cov kev cuam tshuam tseem ceeb hauv qab no yuav tshwm sim thaum lub qhov cub hauv ob sab phlu kub txog 750 degree:
1. Feem ntau yog vim li cas cov roj magnesium thiab cov pa roj carbon monoxide tsim tawm mus rau qhov kub thiab txias ntawm qhov pores. 2. Nyob rau ntawm phab ntsa ntawm lub cub tawg, cov roj magnesium yog dua oxidized los ntawm terbium tebchaw rau hauv magnesium oxide, thiab tsim ib tug siab melting point lithology nrog rau lwm cov kab sib txuas nyob rau hauv magnesia carbon bricks. compound.
Yog li ntawd, kev tswj qhov kub thiab txias ntawm qhov cub thiab tiv thaiv ntau cov tshuaj tiv thaiv 1 yog tus yuam sij rau kev tswj lub ntim ruaj khov ntawm magnesium carbon cib. Qhov no tseem ceeb heev txawm nyob rau hauv lub converter los yog hluav taws xob rauv taws.
