FURNACE BOTTOM DISCHARGE METHOD FOR MELTING FURNACE AND DEVICE THEREOF

PURPOSE:To enable prevention of the stop of discharge of a molten metal in the middle of discharge, by a method wherein a molten metal is cooled for solidification, a tap hole is closed, after completion of a melting and refining process, a metal solidified in the tap hole is heated and molten, and a stopper is elevatably mounted to the upper opening part of the tap hole. CONSTITUTION:When, after a tap hole 24 is close and melting and refining are completed, a high frequency current is fed through a transmission line 36 to a coil 27, the coil 27 generates heat, and a metallic lump solidified in the tap hole 24 is molten, the tap hole 24 is opened, and a molten metal contained in a furnace is discharged through the tap hole 24. When, during discharge of the molten metal, the feed of the molten metal is stopped, a stopper 32 is lowered in the molten metal to close the upper part of the tap hole 24, and through closing of an openable gate 28, the lower part of the tap hole 24 is closed. By cooling the molten metal confined in the tap hole 24 by the feed of cooling water to the interior of the hollow coil 27, the molten metal is solidified in the tap hole 24 again, and the tap hole 24 is closed again to stop discharge.