製鋼作業中でのスラグの泡立ち現象

概要

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During melting period and oxidizing period of steelmaking, very violent foaming action of molten slag is often observed. This important phenomenon has close relationship with heat transfer and reaction rate in the furnace, damages of refractories etc., but there has been made no detailed studies up to now. Because no sufficient study on various physical and chemical values of high temperature molten slag is being advanced at present. Static and dynamic values of surface tension, viscosity, surface elasticity etc. concerning foaming action of liquid have to be made clear, but it is possible to explain roughly and qualitatively about mechanism of foaming action of slag with the results that have been reported up to now.Slag foaming action is apt to occur if the foaming energy caused by O2-blowing, CO-bubbling etc. is supplied from outside in large quantity into molten slag containing surface active elements such as P2O5, SiO2 or heterogeneous solution containing fine solid particles like Cr2O3, WO, SiO2 etc.
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