Abstract
In order to increase the gas utilization and to prevent the sintering phenomena in fluidized bed, experiments of countercurrent reduction of powder ore with CO gas were carried out in a drum-type rotary Fluidized bed at the temperature of 750 and 900°C. In a modeling vessel (diameter: 30cm), the rotary fluidized state could be obtained on the conditions that the filling ratio of powder ore was from 30 to 50% and the dimensionless rotary speed (F) was from 1.0 to 1.2 at room temperature.The motion of powder ore in the drum-type rotary fluidized bed was seemed to be a completely back-mixing flow. The gas-utilization coefficient was maximum on F=1.0, and it could be increased up to the stoichiometric equilibrium concentration for the reduction of ore.The results of a mathematical calculation by using the dimensionless numbers (Gc and Ot), for the countercurrent reduction based on the three-interface unreacted core model were in good agreement with observed data.
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