底吹き転炉吹錬における脱燐挙動と溶銑脱燐法の開発

概要

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Dephosphorization during blowing in a 5 ton bottom blown converter has been studied. The effects of lime size and injection pattern on dephosphorization have also been investigated in a 230 ton Q-BOP. The phosphorus partition suitable for the bottom blown converter has been obtained by the regression analysis of experimental data. Injection of lime and premelt powder mixtures into the 5t test Q-BOP has revealed that dephosphorization proceeds largely in the early stage of blowing. This characteristic has been utilized to develop a new and effective dephosphorization pretreatment of hot metal in Q-BOP. This new technique has enabled us to dephosphorize hot metal from ca. 0.14% to 0.010%P with a consumption of 20 kg CaO/tpig and 3kg CaF_2/t-pig within 2 to 4 minutes of oxygen blowing. The ultra-low phosphorus and sulfur steels have been successfully produced by the newly developed technique.
社団法人日本鉄鋼協会の論文
1982-09-01