Abstract
The kinetics of reduction of molten iron oxide with CO gas at high temperatures of 1450 and 1600°C were investigated. In order to reduce the influence of mass transfer rate on overall reaction rate of reduction, fine powders of iron oxide were used as specimen and were reduced in a transport reactor. After the specimens of fine powder of reagent grade were melted during falling down in reaction zone, liquid oxide drops thus formed were reduced with CO gas. Mean diameter of liquid particles was 25μm.The oxide particles were melted and became spherical, and the reduced iron was surrounded by liquid iron oxide. It is assumed that liquid iron oxide always exists on whole spherical surface and the nucleation, growth and cohesion of iron in liquid drop did not influence the overall reaction.The results were analyzed by considering only the mass transfer in a gas film and the chemical reaction at the gas liquid interface.The value of mass transfer coefficient in gas film kg was estimated by using the Ranz-Marshall equation kgd/D=2.0+0.6Re1/2Sc1/3. Considering the shrinkage of particles by production of metallic iron, the values of rate constant of chemical reaction kc were obtained as 19.4cm/sec at 1600°C and 9.3cm/sec at 1450°C.
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