Experiments on hot metal dephosphorization by using mixtures of Fe oxide and Mn oxide as oxidants were achieved by use of a Tammann furnace. The results were analyzed by the coupled reaction model which consisted of mass transfer equations of each component. Among many unknown parameters in the model, the effective equilibrium constants of P, Mn and S and the mass transfer coefficient in slag phase were changed by the experimental conditions and determined by fitting to the experimental result. The observed distribution ratio of P, S and Mn was consistent with the calculated value for each experiment and the applicability of the coupled reaction model is demonstrated. The degree of dephosphorization, desulfurization, Mn recovery and the reaction rate increased with am increase of Fe-oxide ratio in the flux. The activity coefficients of FeO, P//2O//5 and MnO converted from the effective equilibrium constants were compared with values calculated by the thermodynamic models. Satisfactory agreements were not obtained.
|Number of pages||8|
|Journal||Transactions of the Iron and Steel Institute of Japan|
|Publication status||Published - 1988 Jan 1|
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