OPERATION OF SMELTING REDUCTION FURNACE WITH CARBONIC MATERIAL PACKING LAYER

PURPOSE:To facilitate smelting of ore in raceway in front of tuyere, by charging a part of flux as lump state together with carbonic material from top of furnace at the time of producing molten iron by blowing the powdery iron ore and the flux together with the hot blast from tuyere of carbonic material packing layer type vertical furnace. CONSTITUTION:The carbonic material for solid reducing material is charged in the furnace from a top charging device 6 in a carbonic material packing layer type vertical smelting reduction furnace 1, to form reducing material packing layer in the furnace. The flux 9, such as powdery iron ore 8 and lime, etc., is blown from the upper step tuyere 4 of furnace and at the same time, hot blast from a blasting device 2 is blown to the upper step tuyere 4 and the lower step tuyere 5 through a distributor 3. The iron ore is smelted together with the flux at the raceway space in front of the upper tuyere 4 and reduced into pig iron by carbonic material in front of the lower step tuyere 5. In this case, by charging a part of flux as lump state from the furnace top, the raceway space in front of the upper step tuyere is become to large and smelting quantity of iron ore is increased, to increase the production of molten iron and also SiO2 in ash in the carbonic material is stabilized by the lime, to restrain the increase of SiO2 content in the molten iron.