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Influence of reactive alumina and Calcined alumina on properties of Free Flowing Castables

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China's Refractories 2021年第3期30卷 7-10页

作者： Christian DÜNZEN Nabaltec AG Schwandorf 92421Germany

reactive alumina is a well-established group of raw materials for refractory castables to improve their rheological *** this article the influence of bimodal reactive alumina and standard(alumina on workability,packing density and strength of alumina based castables is *** will be shown that there is a significant effect on water demand and apparent density of the castable,which is depending on the percentage of reactive alumina on the one hand and on the type of reactive alumina on the other *** effect of the alumina on setting time and cold crushing strength has shown to be insignificant in this set of experiments.

关键词： reactive alumina refractory castables calcined alumina rheological behavior

Relation Between Sintering Reactivity of Matrix and Thermal Shock Resistance of Ultra-low Cement Bonded Corundum-spinel Castables for Fired Purging Plugs

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China's Refractories 2018年第4期27卷 13-20页

作者： ZHANG Ju LONG Bin ZHOU Yunpeng Andreas BUHR WANG Feng CUI Qingyang XIE Guofeng DING Dafei JIA Quanli YE Guotian Henan Key Laboratory of High Temperature Functional Ceramics School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Qingdao Almatis Co. Ltd.Qingdao 266510China Almatis GmbH Frankfurt 60528Germany Luoyang LIRR Refractories Co. Ltd.Luoyang 471000China

Purging plugs installed in the bottom of steel ladles are widely used for the secondary refining of high quality steel *** dynamic service conditions and temperature gradients caused by the cold inert gas blown through the plug during stirring create a strong thermal shock impact on the *** can affect its service life and restrict the safety and efficiency of steel making if the plug fails during *** this work,the influence of the particle size distribution (PSD) and amount of reactive alumina on the sintering behavior of ultra-low cement bonded corundum-spinel based castables was investigated on lab *** relationship between sintering reactivity of matrix and thermal shock resistance of castables was evaluated in *** show that the sintering of castables can be intensified by using finer reactive ***,excessive sintering of the castable through finer reactive alumina is negative for thermal shock *** microstructure characterization reveals that castables with more intense sintering show denser matrix structure,which is less effective in hampering crack propagation and therefore results in decline of their thermal shock resistance.

关键词： reactive alumina corundum-spinel castable sintering reactivity thermal shock resistance

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

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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