The slag and molten iron erosion of two kinds of castables in laboratory and field conditions were studied.The erosion part of the castable was characterized by scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS)to clarify its erosion mechanism.It also provides a theoretical reference for the rational selection and optimization of castables for blast furnace hearth.The results show that the castable has good corrosion resistance to molten iron,and the corrosion resistance of castable 2 is better than that of castable 1;the slag corrosion resistance of castables is poor,and the slag corrosion resistance of castable 1 is much better than that of castable 2.The erosion of castables by molten iron is formed by the penetration and erosion of molten iron and the reaction of silicon compounds.The erosion of the castable by the slag is carried out by the dissolution of the castable,the penetration of the slag and the reaction at the interface between the two.Silicon compounds will promote the erosion of castables by molten iron by reacting with molten iron,while alumina has a great influence on the erosion of slag castables.During the operation of the blast furnace,the use value of castable 1 exceeds that of castable 2,which is more suitable for the hearth sidewall under the center line of the taphole.
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