(ECIC-19)The Effect of Molten Slag Wetting on Iron Melting and Slag-Metal Separation in CCA System

摘要

It is well known that the initiation of iron melting and the separation of molten slag rapidly take place incarbon composite iron ores CCA. Since the size of carbonaceous material and iron ore particles is tiny in CCA, thewetting behavior of molten slag can dynamically play a critical role in the iron melting initiation and the metal-slagseparation. The iron melting and slag separation has been clarified by direct observation of the phenomenaoccurring in a simplified carbon composite agglomerate sample (iron disk – slag particle – graphite), which is carriedout by a confocal laser scanning microscope combined with an image furnace. It is found that the molten slagwetting induced the iron melting initiation by attracting graphite or coke to iron to contact each other. The molten slag(without iron oxide) separation takes place after the solid iron particle melting. In the case of slag bearing iron oxide,the separation occurs after the most of iron oxide in the molten slag is reduced. In addition, the mechanism of moltenslag separation from Fe-C melt is verified by using phase field modeling.