ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
High Temperature Performance of Al2O3–SiO2–SiC–C Ramming Refractory While Using Al and BN Additives
Lan HongVeena Sahajwalla
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2013 Volume 53 Issue 12 Pages 2126-2131

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Abstract

High temperature experiments were carried out to investigate the effect of aluminum and BN addition on the performance of Al2O3–SiO2–SiC–C ramming refractory against slag attack. The slag utilized was a typical ironmaking one composed of 45.4% SiO2, 36.6%CaO, 15.9% Al2O3 and balanced by MgO, P2O5 and S. The temperature was set at 1823 K. Infrared (IR), Scanning Electron Microscopy-Energy Dispersive Spectrometer (SEM-EDS) and X-ray Diffraction (XRD) results show that Al is very effective in inhibiting CO and CO2 gas formation resulting from the main in-situ reaction between silica and carbon in the mix and consequently improving the slag corrosion resistance of the material. On the other hand, the sample with BN addition becomes more porous and hence exhibits a deteriorated resistance against slag attack compared to the standard refractory sample due to the fact that the decomposition of BN releases gases. The post-mortem analysis of refractory samples from the Siphon Box of a Cupola Furnace after intense industry service was conducted using an X-ray and SEM-EDS to compare physical properties and the degradation mechanism between the samples after industry service and those used in high temperature laboratory experiments. The resonance of the results for both types evidences the validity of applying knowledge obtained in the current research to actual industrial processes.

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© 2013 by The Iron and Steel Institute of Japan
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