Dynamic Refining Control by Analysis of Exhaust Gas from LD Converter

Abstract

The possibility of blowing control based on exhaust gas data was studied. The amount of oxygen accumulated in LD converter (O_s), which is calculated from the oxygen balance by using exhaust gas data, corresponds to the amount of FeO, Fe₂O₃ and MnO in the slag during blowing.
When the refining reaction was controlled by O_s control, the carbon, phosphorus and manganese contents of steel and the total iron content of slag at blow end were controlled at preferable levels and the fluctuations of levels were remarkably reduced. Namely, O_s is an effective parameter representing the progress of the reaction and can be used to control the blowing at an optimum level.