Countercurrent Reduction of Powder Ore in a Drum-type Rotary Fluidized Bed
1980 Volume 66 Issue 13 Pages 1995-2003
Details
1980 Volume 66 Issue 13 Pages 1995-2003
In order to increase the gas utilization coefficient and to prohibit the sintering phenomena in fluidized bed, the experiments of the countercurrent reduction of powder are with CO gas in a drum-type rotary fluidized bed at the temperature of 900°C and 750°C were carried out.
In a modelling vessel (diameter : 30 cm), the rotary fluidized state could be obtained on the conditions that the filling ratio of powder are was in the range of 30 to 50% and the dimensionless rotary speed (F) was 1.0 to 1.2.
The motion of powder are in the drum-type rotary fluidized bed was seemed to be a completely mixing state. The gas utilization coefficient was maximum under the condition that F was 1.0, and it could be increased up to the stoichiometric equilibrium concentration for the reduction of ore. The results of a mathematical calculation on dimensionless numbers (Gc and Ot) for countercurrent reduction based on the three-interface model were in good agreement with observed data.
