予備処理溶銑の脱炭プロセスにおける新吹錬法の検討

概要

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Decarburization of pretreated hot metal with less slag was studied by use of a 10 t ladle type travelling furnace based on a new idea. The characteristics of refining and the mechanism of post combustion of off gas were discussed. (1) In spite of deep bath (L_0/D=1.0) in the furnace, molten steel was not overoxidized in the case that the flow rate of argon blown from the bottom was more than 0.05 Nm^3/min・t with super soft oxygen top blowing (L≃100 mm). (2) In this method, the post combustion ratio (CO_2/(CO+CO_2)) was very high, so the high temperature rising, almost 200℃/%C, was obtained. This decarburization furnace had large flexibility for heat balance. (3) On post combustion, the parameter K(=(Σ^^iS_i+αΣ^^jS_j′)×3600/(FO_2+FO_2′)) was proposed and the mechanism could be explained by this parameter K on this ladle type furnace and the conventional top and bottom blowing converter.
社団法人日本鉄鋼協会の論文
1987-04-01