Interface reaction between carbon composite brick and blast furnace slag

ABSTRACT The interface reaction between carbon composite brick and blast furnace slag was investigated to clarify the formation and evolution mechanism of slag-rich protective layer on the brick’s surface in blast furnace. The wettability, microscopic morphology, phase components and thickness of the reaction layer between the original/modified brick and slag with different basicities, MnO, CaF2 and FeO additions were analyzed respectively. The results revealed that the mechanism of the deposition process of the slag-rich protective layer was relevant to the ash in the brick and coke, and the slag entrained by coke, the wettability between the brick and slag and the oxides such as MnO and FeO in the slag, the precipitated Ti(C,N) from the molten iron, etc.