In order to improve present iron ore agglomeration processes drastically and meet the demands of future trends in iron ore resources suitably, a new agglomeration process named the Hybrid Pelletized Sinter process was studied. On the basis of a prior experimental study and the semi-commercial plant trial, a No. 4 GasFlow Characteristics in Agglomeration ProcessIn an agglomerating plant using the grate system, the control of gas flow passing through the bed is extremely important because it directly affects the productivity and the yield. Recent studies on the sintering process indicate that in the raw material charging unit, avalanches caused by stickiness and repose angle of the quasi-particles occur periodically along the moving direction of the grate. The productive yield of the sinter is reduced by these avalanches.15) This is attributed to the fact that as permeability in the sintering bed changes locally, due to these avalanches, gas flow fluctuates along the bed depth.In order to prevent the avalanches, various charging devices are being studied.15,16) Bycontrast, the HPS process has the following superior characteristics, in comparison with sintering process: (1) The green pellets are more spherical comparedto the quasi-particles.( 2) Since the surface of the green pellets is covered C 1993 ISIJ ISIJ International, Vol. 33 (1993)

2) The restraint of SiO gas formation around the raceway by the lower theoretical flame temperature (TFT8)).4) In order to achieve these ideas smoothly, the following points were put into practice at No. 5 BF: When the HHL is reduced, the tapping temperature increases from TB to TB/ (TA-To~TB'). At this point, water injection is increased to obtain the constant tapping temperature (T1~)' Water injection results in lower temperature (To!)

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