DETECTION OF SLAG OUTFLOW

摘要

PURPOSE:To detect the outflow of slag with high accuracy by receiving the thermal radiation energy of a molten metal flowing down in an immersion nozzle with a receiving antenna via a microwave lens. CONSTITUTION:A microwave lens 9 is installed on the outside of an immersion nozzle 5 attached to a sliding nozzle 3 installed in the bottom of a ladle 1, in such a way that the focus of said lens is brought to the position where a molten metal flows. A receiving antenna 10 of which the detecting direction is directed toward the lens 9 is disposed on the side of the lens 9 opposite from the focus thereof. The thermal radiation energy of the molten metal (m) and slag S flowing down in the nozzle 5 is received with good accuracy by such lens 9, the antenna 10 and a radiometer 11 connected to the antenna 10 from a remote place apart by several meters. The outflow of the slag S is detected from the change in the thermal radiation energy thereof.