Method for operating a vacuum melt assembly and vacuum melt assembly operated according to this method

摘要

The method involves detecting the acoustic signals generated in a ladle (6) which receives molten steel, by structure-borne noise detectors (30-1-30-4) which are directly or indirectly acoustically coupled to the ladle. The acoustic signals are used to determine the height (H) or thickness (d) of the foamed slag (18) found in the ladle over a molten bath (14) of the molten steel. The time derivative of the height and the thickness of the foamed slag, is determined for controlling the supply of process gas (P1,P2) in the ladle. An independent claim is included for a vacuum melting system.