イルメナイト鉱のアーク炉内炭素還元に関する二段反応モデル

概要

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A comprehensive mathematical model was developed to simulate the reduction of ilmenite ore with carbon in commercial electric furnaces. Two distinct reaction sites were assumed to exist in an open arc furnace : seething surface and bulk bath of titania slag. The model takes into account such physical features as surface tension (or Laplace-Kelvin pressure), viscosity and density (or residence time by Allens law), together with equilibrium mass balances incorporating the thermodynamic properties of the TiO2 - TiO1.5 - TiO - FeO - SiO2 - AlO1.5 - MgO slag and the molten Fe-C metal. The model explains all known industrial observations : interdependence of the TiO2 content of slag and the carbon content of pig iron, its variation with temperature, electric power consumptions, and so forth. The model also provides partial explanations for the foaming and permanent CO gas boiling of the slag. The computer model predictions can be used to monitor and optimize the conditions for smelting different ores in various operating modes.
1998-12-25