Slag Foaming: Fundamentals, Experimental Evaluation and Application in the Steelmaking Industry

A. P. Luz, T. A. Ávila, P. Bonadia, V. C. Pandolfelli


Volume 3, Issue 2, Pages 91 - 98


The slag foaming process is currently applied to some equipment for steel production (i.e., electric arc furnace (EAF), basic oxygen furnace (BOF), etc.) aiming to save energy, improve productivity, enhance the refractory service life and inhibit steel re-oxidation. However, the correct control and optimization of the foam generation on the slag surface are still limited and some factors such as basicity, FeO concentration, surface tension, viscosity and how the suspended second phase particles in the liquid act directly in the slag foaming behaviour, need some further understanding. Therefore, this work addresses the main factors that induce foaming, experimental tests used for its evaluation and the use of thermodynamic data in order to control the slag composition while the equipment is being operated. Considering the data presented in the scientific literature, there are various conditions and situations to be explored and thermodynamic calculations seem to be the most suitable tool for these investigations.



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