Effect of top and bottom blowing conditions on metallurgical characteristics in converter

Abstract

Experiments were carried out in 2 × 103 kg converter in order to quantitatively evaluate the contributions of condition of top and bottom blowing to critical carbon content, Cp and (T.Fe) in slag. Cp decreased and (T.Fe) in slag increased as increasing the bottom stirring power and ratio of cavity depth to bath depth, L/Lo. Effect of L/Lo could not be explained by conventional indices such as ISCO, BOC and I because they did not take top blowing condition into consideration precisely. Newly defined index for carbon oxidation, ICO, was introduced to attain good correlation between operational conditions and (T.Fe) in slag. ICO=4.2×103·(Q/W)·(L/Lo)-0.4· ε-0.33·[C]-1