CaO-CaF_2 系フラックス吹込みによる取鍋内溶鋼の脱硫

概要

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A study was made on the desulfurization rate of steel by CaO-CaF_2 powder injected into a 150 t ladle. EPMA analysis of suspending particles taken from an Al-Si killed steel melt during powder injection was made, and two types of particles contributing to desulfurization were found. The one formed by coalescense of injected powder with deoxidized Al_2O_3 particles showed a high sulfur partiton ratio of 1000 to 6000. The other type of suspending particles formed by coalescense of injected powder with entrained top slag and Al_2O_3 showed a lower sulfur partition ratio. Observed sulfur partition ratios of both types of particles agree with those estimated from thermodynamic calculation, which indicates that the reaction between suspending particles and sulfur in a steel melt is in equilibrium. A model was proposed, which took account of resulfurization from top slag. Calculation based on the model shows that the contribution of transitory reaction to overall amount of desulfurization is approximately 46% under this experimental condition.
社団法人日本鉄鋼協会の論文
1988-05-01