<報文>小型高圧移動層反応装置による還元鉄製造の基礎的研究(第2報) : 酸化鉄ペレットの水素還元における速度パラメータの測定

概要

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Stepwise reduction experiments of single iron oxide pellets by H_2-H_2O mixture were carried out within the temperature range of 723〜1273 K and the rate parameters, i.e. chemical reaction rate constants and intraparticle diffusivities, were determined by the one-interface unreacted core model. The rate parameters of the reduction step from magnetite to wustite were found to be extremely small at low temperature below 973 K. The data fitting method was also applied to estimate the same rate parameters as mentioned above. The values of the rate parameters obtained by these two methods were tested with the application to the reduction of a single pellet by pure hydrogen and to the process analysis of a laboratory scale moving bed. It was found that some problems still remained in the application of the rate parameters obtained by stepwise reduction to the hydrogen reduction of a single pellet, however they were applicable to process analysis of the laboratory scale moving bed. Furthermore, it became clear that the rate parameters obtained by the data fitting method could be sufficiently applied, if the values of stepwise reduction were used in the reduction of magnetite pellet to wustite at low temperature.
東北大学の論文
1980-09-30