1997 Volume 37 Issue 11 Pages 1066-1071
To utilize pisolite ores as raw materials of iron ore sinter, a commercial production trial was carried out by designing the structure of quasi-particles. Main results obtained from the trial are summarized as follows:
(1) The commercial production test using 40 mass% pisolite ores in raw materials showed that high quality sinter was produced by making quasi-particles having duplex structures; the inner core is granulated by raw materials containing the pisolite ores and the outer shell is coated with both coke fine and high grade magnetite ore fines.
(2) According to the reduction kinetic analysis of sinter products, high reducibility of the products produced from quasi-particles having the duplex structure results in the improved reduction rate parameters resulting from the product structures containing many micro-pores ranged from 10 to 100μm.
(3) Improved reduction degradation characteristics of the products depend on decreased hematite phase and increased magnetite phase in the sinter structures as well as micro-pore distributions.
