高速溶銑予備処理と直結した転炉レススラグ吹錬における Mn 分配平衡(転炉-取鍋精錬技術と高純度鋼製造)(<特集>転炉機能の拡大)

概要

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In Keihin Works low phosphorous hot metal has been obtained stably in large quantities, after improving operational conditions at hot metal dephosphorizing station. Optimum conditions of less slag blowing at BOF using pretreated hot metal, were also studied, in particular, on Mn partition between slag and metal. Total process of hot metal dephosphorization and less slag blowing which contributed to cost saving was established. The following results were obtained by the study of metallurgical charactarization of hot metal dephosphorization and less slag blowing. (1) (%T. Fe) depends on top oxygen flow rate and bottom stirring. Reduction of top oxygen flow rate and increase of bottom stirring are important for reducing (%T. Fe). (2) Comparing slag oxygen potential with metal oxygen potential, the former is higher than the later. But its difference becomes to be small as decreasing the carbon content in metal. Mn partition ratio between slag and metal apparently depends on intermediate oxygen potential between those of slag and metal.
社団法人日本鉄鋼協会の論文
1990-11-01