Aluminium magnesia carbon cibyog cov khoom uas tsis tau hlawv ua los ntawm tshwj xeeb high-alumina bauxite clinker, fused magnesia los yog sintered magnesia thiab graphite li raw cov ntaub ntawv, thiab kua phenolic resin ua ib tug binder. Lub cev thiab tshuaj ntsuas ntawm aluminium-magnesium carbon bricks Raws li kev txhim kho ntawm txhuas-magnesium carbon cib, aluminium-magnesium spinel carbon cib rau ladle tau tsim. Aluminium-magnesium spinel carbon cib yog cib nrog ib feem ntawm pre-synthesized magnesium-aluminium spinel ntxiv rau cov khoom ci ci, thiab lawv cov kev ua tau zoo dua li ntawm aluminium-magnesium carbon bricks ntawm tib qib.
1. Cov yam ntxwv ntawm aluminium-magnesium carbon cib
Raws li cov khoom siv refractory rau hauv ob sab phlu ntawm lub qhov cub refining, aluminium magnesia carbon bricks muab tag nrho cov kev ua si rau lub zog slag yaig tsis kam ntawm magnesia thiab qhov qis expansion thiab siab thermal conductivity ntawm carbon, ua rau qhov tsis zoo ntawm cov tsis zoo spalling tsis kam ntawm magnesia. Kev ua tau zoo ntawm aluminium-magnesium-carbon bricks yog raws li nram no:
(1) MgO thiab C tsis muaj kev sib raug zoo ntawm qhov kub thiab txias. Lub melting point ntawm carbon yog siab tshaj 3000 degree, thiab lub melting point ntawm MgO mus txog 2800 degree. Ob leeg yog refractory raw khoom nrog zoo heev kub kuj.
(2) Zoo heev tiv thaiv alkaline slag corrosion. MgO muaj zog tiv thaiv alkaline slag thiab siab hlau slag. Nyob rau tib lub sijhawm, lub kaum sab xis ntub dej ntawm graphite rau slag yog qhov loj, lub slag tsis yooj yim rau nkag mus, thiab cov txheej txheem metamorphic yog nyias.
(3) Al2O3 reacts nrog MgO hauv matrix ntawm qhov kub thiab txias los tsim aluminium-magnesium spinel. MA spinel muaj qhov me me elastic modulus thiab me me thermal expansion coefficient. Nws tuaj yeem hloov pauv MF spinel thib ob hauv periclase thiab nrog rau qhov ntim nthuav dav. Nws tuaj yeem thaiv qhov pores thiab inhibit ntxiv kev nkag mus ntawm slag.
Ib tug loj npaum li cas ntawm CaO nyob rau hauv lub slag reacts nrog Al2O3 los ua high-melting-point columnar CA6 thiab ib tug me me ntawm CA2. Nrog rau kev tsim cov minerals xws li CA, ib tug loj npaum li cas ntawm CaO nyob rau hauv lub slag yog noj, uas ua rau kom lub viscosity ntawm slag thiab txo permeability ntawm lub slag. Nyob rau tib lub sijhawm, spinel hauv matrix ntawm qhov kub siab tuaj yeem ntes FeO thiab MnO hauv cov slag los ua cov tshuaj spinel, uas tuaj yeem txhim kho cov slag tsis kam ntawm aluminium-magnesium carbon bricks. AMC bricks muaj qee yam kev nthuav dav, yog li cov pob qij txha cib nruj thiab kev ncaj ncees zoo tom qab siv.
2. Cov teeb meem ntawm aluminium magnesia carbon cib hauv daim ntawv thov ladle
Feem ntau ntawm cov ua hauj lwm hauv ob sab phlu ntawm cov loj thiab nruab nrab-qhov loj refined ladle nyob rau hauv Tuam Tshoj siv txhuas-magnesium carbon cib. Vim muaj cov ntsiab lus ntawm cov pa roj carbon ntau ntawm aluminium-magnesium carbon cib, nws yuav muaj cov pa roj carbon zoo rau cov hlau molten, cuam tshuam rau smelting ntawm tsawg-carbon steel, ultra-low-carbon steel thiab lwm yam hlau. Nyob rau tib lub sijhawm, nws cov thermal conductivity yog loj heev, uas yuav ua rau kom qhov kub thiab txias poob ntawm molten steel, uas tsis yog conducive mus rau lub kub tswj ntawm casting technology. Aluminium-magnesium carbon ladle bricks react chemically nrog Al2O3 thiab MgO hauv matrix los tsim aluminium-magnesium spinel, ua rau lub ntim ntawm cov khoom nthuav dav, ua rau muaj kev ntxhov siab nyob rau hauv lub ladle ua hauj lwm hauv ob sab phlu thaum siv, ua rau lub cib qauv tev tawm, cuam tshuam rau kev nyab xeeb ntawm kev siv.
Txhawm rau txhim kho kev lag luam kev sib tw, Ma Steel No. 3 Steel Plant ntxiv cov txheej txheem LF refining system kom paub txog cov cua sov arc, roj nplawm thiab lub cub tawg ua kom zoo rau kev kho qhov sib xyaw. Los ntawm kev ntxiv dag zog rau kinetic thiab thermodynamic cov tshuaj tiv thaiv, cov hlau molten tuaj yeem ua kom huv thiab sib xyaw ua ke hauv lub sijhawm luv luv, ua tiav cov txiaj ntsig ntawm refining. Vim lub siab kub nplawm thiab scouring, muaj zog alkaline slag yaig thiab lub sij hawm ntev immersion ntawm molten hlau thaum refining, qhov chaw ua hauj lwm ntawm lub ladle hauv ob sab phlu yuav hnyav heev. Txhawm rau kom ua tau raws li kev siv LF refining system ntawm Ma Steel No. 3 Steel Plant thiab kev ua haujlwm ntawm lub ladle, lub neej ntev aluminium-magnesium-carbon lining cib rau lub ladle tau tsim tshwj xeeb. Al2O3-MgO-C series ladle bricks rau ladle hauv ob sab phlu muaj cov yam ntxwv ntawm kev kub siab ua haujlwm, zoo slag kuj thiab thermal shock stability.
