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A growing attention has been paid for the promotion of lime fluxing in order to meet the recent demands, that is, high efficiency and rapid operation of refining processes, which realize reduction of slag emission and suppression of calcium fluoride as well as shortening the operation time. Up to now, there have been several investigations reported on the dissolution behaviour of CaO into refining slags. Matsushima et al.1) have shown the appropriateness to take the difference between CaO concentration of the slag and that for CaO saturation as the driving force of the CaO dissolution into the slag. Recently, the effect of additional components such as Al2O3 and CaF2 on the dissolution rate of CaO into the CaO–FetO–SiO2 slag has been investigated.2) Regarding the multi–phase flux refining process,3) absorption of phosphorus into 2CaO·SiO2 phase (hereafter, abbreviated as “C2S”) has been elucidated. Innovative work has been done on the utilization of gas generation from the quick lime which effectively crushes the surface layer to promote the CaO dissolution.4) Mechanism of CaO dissolution which has been revealed on the basis of the foregoing studies is that C2S layer firstly forms on the surface of the lime on immersion and then dissolves into slag rich in FeO, where two steps reactions are considered and the rate–controlling step would be the C2S dissolution into molten slag.5) However, all these Rate of 2CaO·SiO2 Dissolution into Molten CaO–FeO–SiO2 Slag Saturated with Solid Iron

Rate of 2CaO·SiO<sub>2</sub> Dissolution into Molten CaO–FeO–SiO<sub>2</sub> Slag Saturated with Solid Iron