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Prediction of powder reaction rate from Hao-Tanaka's model

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According to the Hao-Tanaka's model, the powder reaction rate should be predictable only from the particle sizes, molar ratio of the samples and the diffusivity of the diffusing component in the course of the reaction. In this paper, the realizability is examined with respect to MgO-Al2O3 and Fe2O3-V2O5 systems in which the reaction rate is controlled by the counter diffusion and one way diffusion, respectively. The use of appropriate values of the diffusivities brings about fairly good agreement between the predicted curves of the reaction rate and the experimental values in both systems.

Affiliations: 1: Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita-ku Sapporo 060, Japan; 2: Department of Process Engineering, Faculty of Engineering, Hokkaido University, Kita-ku, Sapporo 060, Japan


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