Thermodynamic calculation and slag resistance analysis of Al2O3-SiC-C taphole clay during corrosion
Insufficient corrosion resistance of taphole clay leads to problems such as short tapping time or splashing during service,but the invisible service environment of taphole clay makes it difficult to analyze the corrosion process.Therefore,in response to this issue,the corrosion process of slag on Al2O3-SiC-C taphole clay at 1 450 ℃ was calculated using FactSage thermodynamic software,and the dynamic slag re-sistance test was used to analyze the corrosion of slag after different durations(0,8,16,24,and 32 min).The results show that in the process of slag corrosion,anorthite first forms,and then Al2O3 precipitates from the Al2O3 saturated liquid phase to generate an Al2O3 isolation layer;gehlenite forms at the interface be-tween the taphole clay and the slag during the further corrosion,and the final corrosion products complete-ly melt into the liquid phase.The results of the corrosion test are consistent with the thermodynamic calcula-tion.The liquid phase and low-melting point-phases generated during corrosion reduce the critical strength of the taphole clay,leading to accelerated corrosion.When the corrosion time is 32 min,the sample is com-pletely corroded.
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