METHOD FOR CONTROLLING DISCHARGE OF MOLTEN METAL FROM METAL MELTING FURNACE

PURPOSE:To automate discharging and stopping operation of molten metal by arranging an induction heating device as heating means inside of a furnace and an induction heating device possible to change over heating and cooling outside of the furnace in molten metal discharging tube in the metal melting furnace. CONSTITUTION:The molten iron discharging tube 3 is connected to an iron tapping hole 2 in a lower part of the blast furnace 1, and the molten iron 4 in the blast furnace 1 is discharged to a molten iron trough 5. The induction heating devices 6a, 6b composed of an electromagnetic coils 7a-7d made of cooled copper pipe are connected to the above molten iron discharging tube 3 surrounding the outer circumference thereof. These are independently controlled with induction current generators 9a, 9b. Among these devices, the induction heating device 6a inside of the furnace is used as heating device to prevent solidification of the molten iron 4 in the above discharging tube 3. On the other hand, the induction heating device 6b outside of the furnace is used by changing over as the heating device at the time of conducting the current and as the cooling device at the time of stopping the current. By this method, the molten iron 4 in the discharging tube 3 is melted or solidified to execute start or stop of the discharge of the molten iron 4 from the blast furnace 1.