石灰-蛍石系スラグによる溶銑脱りん反応の熱力学と反応速度(脱りん・脱硫 : 石灰系スラグ)(<特集>溶銑処理の発展)

概要

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Thermodynamics and kinetics of hot metal dephosphorization reaction have been studied for the slags containing 10 to 50% CaF_2 in the quasi-ternary CaO-SiO_2-CaF_2 system. From the fundamental experiments, an equation with respect to phosphorus partition equilibrium was derived and the thermodynamic effect of CaF_2 addition was discussed. It was indicated that the increase in the activity of (FeO) was one of the main reasons of achieving high phosphorus partition ratio by CaF_2-containing slag. The rate controlling step of dephosphorization reaction was determined to be the supply of oxygen, in the form of (FeO), to the reaction interface. Based on the result of the fundamental experiments, 250 t scale test has been carried out, and it is considered that the hot metal dephosphorization treatment with the slag in CaO-SiO_2-CaF_2 system is beneficial for the production of high quality steel with less phosphorus content. In terms of the mass production, the process is likely to be more promising, with the improvement of the acceleration of dephosphorization reaction rate.
1983-11-01