Lancing in electric arc steelmaking

Details Lancing in electric arc steelmaking Lancing in electric arc steelmaking

C - Chemistry, Metallurgy

21

C

39/105, 53/88

C21C 5/32 (2006.01) C21C 5/52 (2006.01) F27B 3/26 (2006.01) F27B 3/28 (2006.01) H05B 7/144 (2006.01)

Patent

CA 1204590

ABSTRACT IMPROVEMENTS IN LANCING IN ELECTRIC ARC STEELMAKING. The invention concerns a method of controlling the depth of immersion of an oxygen lance in a bath of molten material contained in an electric arc furnace. The noise emitted from the furnace during lancing in an acoustic spectrum ranging between 1 kHz and 15 kHz and defined by a plurality of selected frequency bands is monitored and the position of the lance with respect to the bath surface is controlled by reference to the amplitudes of the output signals emitted from each of the selected frequency bands. The emitted noise is, in one embodiment, applied to a plurality of frequency filters responsive to third octave bands of frequencies ranging between 3.15 kHz and 10 kHz.

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