| 摘要 |
PURPOSE:To appropriately secure the fluidity in a reducing furnace and to efficiently reduce iron ore by supplying iron ore into the exhaust pipe ot the furnace, sizing the ore by a classifying and preheating cyclone and a solid-gas separation cyclone, and supplying the sized ore into the furnace. CONSTITUTION:The iron ore in a hopper 6 is supplied by a feeder 7a into the exhaust pipe 5 of the fluidized-bed reducing furnace 1, and transported to the classifying and preheating cyclone 2 by the reducing gas discharged from the furnace 1 while being preheated and dried. The coarse iron ore is classified and collected by the cyclone 2, and discharged from a discharger 7c. The iron ore classified to a specified grain size is entrained by the reducing gas, transported to the solid-gas separation cyclone 3, and separated from the reducing gas. The sized iron ore heat-exchanged with the reducing gas, dried, and preheated is sent downward through a transport pipe 8, and supplied to the furnace 1 by a feeder 7b. By this method, good fluidity can be secured in the furnace 1, and the ore is efficiently reduced. |
