CaO粉による溶銑の脱硫効果に及ぼす添加酸化物の影響(<特集>革新的高効率混合・分離リアクターの開発)

概要

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Utilization of CaO-CaF_2 fluxes provides an efficient and inexpensive method for the dusulfurization of hot metal and has been used extensively. However, it is an urgent necessity to develop an effective desulfurization treatment without CaO-CaF_2 fluxes from the environmental point of view. Experiments were carried out mainly at 1400℃ to clarify the effect of oxide additives on the desulfurization behavior of hot metal by using CaO-based powders and synthesized CaO-Al_2O_3 slags. The desulfurization efficiency of CaO-based powders increased by the addition of Al_2O_3 and Na_2CO_3. However, as the amount of Al_2O_3 addition increased up to 30mass%, the initial desulfurization rate was decreased, although the formation of liquid slag at the early stage of reaction was promoted. CaO-Al_2O_3-TiO_2 fluxes were found to have the largest promoting effect on the desulfurization, due to low melting point and low viscosity of such slags. According to the EPMA mapping analysis, it was found that the flux powders near the slag-metal interface were sintered or partly melted, and that the sulfur removed was concentrated in this flux. As the result, the desulfurization rate was considered to be considerably accelerated by Ar blowing into the metal bath. Consequently, CaO-Al_2O_3-TiO_2 fluxes was regarded to be very useful for hot metal treatment.
社団法人日本鉄鋼協会の論文
2004-06-01