Process of controlling the slag in a top-blowing steelmaking converter

Abstract From the Canadian patent

In the operation of a top-blowing steelmaking converter having at least one blowing lance the distance of, said lance from the surface of the molten metal bath is controlled in dependence on the sound levels of the blowing noise measured through the slag at selected frequencies. In order to minimize the risk of slopping the actual values of, the sound levels measured at predetermined frequencies are combined to form a resultant value, the difference between said resultant value and a predetermined reference value which is associated with a sound level and indicates that sloping is likely to occur, is determined and said difference, is used as an indication of the probability of an …