Mathematical Model of LD Converter Process Taken Account of Oxidation of Phosphorus and Manganese of Rate of Lime Solution

Abstract

Mathematical model for determining the variations of process variables which take place with the progress of blowing in LD converter is developed in this work.
Concerning the oxidations of phosphorus and manganese, direct oxidations by oxygen gas occurring at cavity and indirect oxidation by wustite taking place at the interface between slag and metal have been taken into account in the model. Furthermore, a modified phase diagram for the ternary system (CaO)-(FeO)-(SiO₂) has been applied to modeling the process of lime solution.
On the basis of the model, numerical calculations have been conducted under various operating conditions with the aid of digital computer. The results calculated on the variations of process variables have been compared with the experimental data obtained by other investigators and the former has been in good agreement with the latter.
The effects of the mass of lime solved in the bath, of the slag basicity and of the bath temperature on the fractional dephosphorization at the end of blowing have been evaluated by use of the model under the hypothetical operating conditions and the maximum value of fractional dephosphorization has been illustrated theoretically in this paper.