The supersonic jets of gas which is expiring into the melt from nozzle of BOF lance have a powerful acoustic radiation. The sound intensity of the jets is up to 200 dB and it is the most powerful natural source of sound. The jets invasion into heterogeneous unstable and gas saturated liquid melt-solution is the cause of the cavitation phenomena into the liquid. This explains the spontaneity of the gas formation and the speed of the decarburization process throughout the entire volume of the liquid metal volume. Using sound intensity changes, in the 60-th years of the last century, was developed the acoustic monitoring and control system of slag process into the BOF furnace.
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