METHOD FOR THERMAL TREATMENT OF GRANULATED IRON ORE BEFORE REDUCTION

摘要

The wet granulated iron ore is initially conducted through a drying zone. The ore leaves the drying zone at a temperature of 120-400 ~C. The ore is then heated in direct contact with hot gas to temperatures of 700-1,100 ~C before being delivered to a reduction zone. The ore coming out of the drying zone is fully or partially guided through a separating device so as to separate the ore into fine and coarse grain fractions. The fine-grained ore fraction is conveyed to a granulating device so as to produce an iron ore granulate which is conducted to the drying zone. The coarse-grained ore fraction is heated to temperatures of 700-1,100 ~C before it is guided into the reduction zone.