PROCESS OF DIRECTLY REDUCING IRON OXIDECONTAINING MATERIALS IN A ROTARY KILN

摘要

Materials containing iron oxide are reduced to iron sponge by means of solid carbonaceous reducing agents, coarse-grained iron oxide-containing material being charged into the charging end of the rotary furnace and fine-grained iron oxide-containing material being blown into the reduction zone. To prevent plant upsets by fine-grained material, the lumpy iron oxide-containing material is, before it is charged to the rotary furnace, separated at a screening cut of 3 to 6 mm and a screening cut of 0.8 to 1.5 mm into a coarse fraction, a fine fraction and a very fine fraction, the coarse fraction is charged into the charging end of the rotary furnace, and the fine fraction is blown from the discharge end of the rotary furnace into the reduction zone and distributed on the charge.