Improvement of the process of feeding the slag-foaming material to the electric arc furnace (EAF), using of the sound

The research described, aimed to determine the value of the sound level (originating exclusively from the operating electric arc) at which the feeding of the slag foaming material to the Electric Arc Furnace (EAF) should start, in correlation with the stabilization of the furnace’s active power consumption level. For this purpose, the frequency band generated by the working electric arc was extracted from the entire spectrum of sound emitted by the furnace. Using sound analysis in 1/3 octave bands, the focus was on the band with a center frequency of 100 Hz. It was found that feeding the foaming material should start at a sound level of 103 dB