Abstract
The characteristics of the reduction process of sintered ore in a fixed bed with the radial distribution of particle sizes were studied. The reduction rate of sintered ore by CO gas was measured continuously by a weighing method in the range of reducing gas flow rate from 12g·6 to 50.4 NI/min at 900°C.
The following results were obtained.
(1) At a constant ratio of the bed weight to gas flow rate (M/V), 25g·min/Nl the effect of gas film resistance in the range of reducing gas flow rate from 12g·6 to 50g·4NI/min on the reduction process was to be disregarded.
(2) The gas utilization coefficient obtained in the fixed bed with a mixed charge of different sizes of sintered ore was observed to be greater than that obtained with a radially distributed charge of the same sintered ore. The calculated results using the rate constants for the reduction process for the uniform size in a bed were in a good agreement with the data obtained in the fixed bed with a mixed charge and a distributed charge of different sizes of sintered ore, respectively.
(3) In a fixed bed with a radially distributed charge of different sizes of sintered ore, the effect of gas flow rate in the range from 12g·6 to 24g·4 NI/min on the reduction process was small.
