METHOD FOR CHARGING RAW MATERIAL INTO SMELTING REDUCTION FURNACE AND CHUTE FOR CHARGING RAW MATERIAL INTO SMELTING REDUCTION FURNACE

摘要

PURPOSE: To produce molten iron in good yield of raw material by returning fine powdery iron ore and powdery coal generated from a smelting reduction furnace and a pre-reduction furnace together with coarse grain iron ore and coal back to the smelting reduction furnace, in the iron ore smelting reduction furnace providing the pre-reduction furnace. ;CONSTITUTION: The coarse grain iron ore from the fluidized bed type pre-reduction 2 is charged into the converter type smelting reduction furnace 1 through a chute 5. High temp. reducing exhaust gas containing dust generated from the smelting reduction furnace 1 is subjected to the fine powdery dust separation in a cyclone 3 and supplied into a fine powdery dust carrying pipe 9 or into a chute 7 for pulverized coal from a cyclone 4 by changing over dumpers 12a, 12b with a carrier gas 11 of N₂, etc. It is then connected to the chute 5 for coarse granular into ore and a chute 6 for coarse granular coal and supplied into the smelting reduction furnace 1 together with the coarse granular iron ore and coal. The high temp. exhaust gas from the smelting reduction furnace 1 is supplied into the pre-reduction furnace 2 after separating the dust by the cyclone 3 and the coarse granular iron ore in the furnace is pre-reduced in the solid phase and charged into the smelting reduction furnace 1 through the chute 5 and the fine powdery raw material in the dust is effectively utilized.;COPYRIGHT: (C)1993,JPO&Japio