After hydrogen-rich smelting in blast furnaces,the gasification reaction behavior of coke has undergone significant changes,which directly affects the wettability of the slag-coke interface,and has a significant impact on the permeability and liquid permeability of blast furnaces.The influences of different conditions on the wettability of slag-coke interface were studied by measuring the contact angle of slag-coke interface.The three-dimensional mor-phologies of the coke surface were characterized using a laser confocal microscope and the mechanism of the slag-coke interface was analyzed.The results indicate that with the increase of reaction time between coke and H2O,the sur-face porosity of coke increases,enhancing the wetting driving force of slag on the coke surface,reducing the contact angle,interfacial surface tension,and interfacial reaction rate between slag and coke surface.The interfacial adhe-sion work increases,and the wettability of slag-coke on the coke surface improves.As the slag basicity decreases and w(FeO)increases,the contact angle and interfacial tension between the slag and coke surface decrease,the in-terfacial reaction rate and adhesion work increase,and the wettability of slag-coke improves.The change in wettabil-ity is relatively small when the basicity ranges from 1.1 to 1.3,and the improvement in wettability is most signifi-cant when w(FeO)increases from 5％to 10％.The decrease in basicity and the increase in w(FeO)both increase the corrosion effect of slag on the coke surface,resulting in a significant increase in surface porosity and pore depth of coke,increase in atmospheric pores,and enhanced adhesion effect of slag on coke,which is not conducive to blast furnace production.
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