2017 Volume 103 Issue 6 Pages 254-261
In order to decrease slag (SiO2, Al2O3 etc.) contents in sinter ore, it is an effective option to increase ratio of ultra fine iron ores called as Concentrate (Conc.) or Pellet Feeds (PF) in sintering mixture owing to its relatively lower slag contents than typical Sinter Feeds (SF), which, however, has a drawback to decrease the permeability of the sintering bed and sinter productivity.
This report has investigated the optimal ratio of PF/SF in a separate granulation process in terms of the productivity by means of pot sintering test with granules observation, and plant trial.
The pot test (300 mm diameter), where approximately 20% of raw materials, which include the PF, were mixed by high speed intensive mixer and then granulated by pan pelletizer, showed that the optimal PF/SF ratio was 3/1. The observation of granules revealed that P-type granules began to increase from the optimal ratio on up.
The plant trial of 8 hours at Wakayama No.5 sinter plant confirmed that the productivity came to maximum at the PF/SF ratio of 3/1 under using 20 mass% of PF in the sinter mix.
