METHOD FOR CHARGING RAW MATERIAL INTO BLAST FURNACE

PURPOSE:To keep perfect mixed condition of raw material in a furnace by holding charged raw material upper level to higher than bottom face of conical bell and continuously supplying the raw material from gap between the bell bottom face and furnace top wall. CONSTITUTION:The upper surface of the raw material 2 in furnace top part in the blast furnace is held to higher than the bottom face level of the conical bell 11. At the time of lowering the level of the raw material 2 according to descent of the charging material 3 in the furnace, the mixed raw material 1 in a uni-pressure discharging hopper 5 is supplied into an upper hopper 10 in the furnace top through lower sealing valve 8. The charged raw material 2 goes down from the gap 12 between the bell 11 and the furnace top wall 2, to form reversed conical-shape surface 13 at lower space 14 in the bell. Furnace gas passes through the reversed conical-shape surface 13 and comes to the lower apace 14 in the bell and is exhausted from exhaust gas ducts 4 arranged at opening part of sloping face part of the bell 11. By this method, the separation of coke and ore at the time of charging them into the furnace is prevented and the perfect mixed condition in the furnace can be kept.