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Analysis of Corrosion Mechanisms of Low-cement or No-cement Al_(2)O_(3)-MgO Gunning Mix with Special Calcined Alumina in Rotary Slag Test

引用

China's Refractories 2023年第4期32卷 16-21页

作者： lee yaotsung ZHAO Lite lee Johnson LIU William Hsin LianHsin EnterpriseCo. Ltd.Kaohsiung 831702China ALTEO Alumina Taipei 110502China Wuhan Ruxing Technology Co. Ltd.Wuhan 430415China

Al_(2)O_(3)-MgO and Al_(2)O_(3)-spinel low cement castables(LCC-AM and LCC-AS)have been extensively used in steel ladles as working ***,the use of alumina-magnesia gunning mixes has been mainly kept for maintaining these castable linings,because of high rebound loss,poor green strength,high porosity and short *** to a high BET alumina(MC-G),it is now possible to develop a series of high-performance no-cement or low-cement Al_(2)O_(3)-MgO gunning mixes(NCG-AM or LCG-AM).The paper focuses on the BOF slag resistance of NCG-AM,LCG-AM,LCC-AM and *** corrosion mechanisms of rotary slag samples were studied by scanning electron microscopy(SEM/EDS).The results reveal different microstructures around MgO particles,depending on the four used *** and thicker spinel phases were formed in NCG-AM,which was proved to have the best corrosion resistance after the dynamic slag ***-G can provide a high diffusion flux of Al^(3+)in terms of kinetics and hence inhibits Kirkendall porosity around MgO *** addition,a continuous spinel phase acts like a pinning nail to reinforce the matrix and thus decreases erosion by *** contrast to NCG-AM,the porous spinel phase was found around unreacted MgO particles and some particles were carried away near the interface of LCC-AM and *** NCG-AM containing MC-G had been tested in two steel plants,and it extended the service life of the ladles up to 50%.In addition,this study suggests the potential application of NCG-AM as steel ladle linings.

关键词： reactive alumina ladle working lining dynamic slag test kirkendall effect no-cement gunning mix

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