Foaming slag operation at the EAF process is state of the art. A stationary foam operation can be maintained only by adjustment of the blowing parameters according to the real situation in the furnace. The best results can be achieved by using an automatic slag management system which is able to detect the actual situation quantitatively and control the carbon addition in order to achieve perfect foaming condition. From operations aspect it is essential to have simple and robust devices for slag determination, since this requires a minimum of installation cost and a minimum of failure risk. The automatic foaming slag based on harmonics analysis of the current is a meanwhile proven technology is meanwhile implemented in numerous installations worldwide.
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