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Hot metal pre-treatment process has been recently employed and carried out prior to the decarburization in the converter. Since this process is conducted at relatively low temperature, say c.a. 1 350°C, retardation of lime dissolution into the slag has become a significant problem, which dissolution is essential for rapid and effective dephosphorization. Dissolution of lime into molten slag would proceed by two step reactions, namely, the formation of 2CaO·SiO2 on the surface or in the vicinity of the lime and dissolution of 2CaO·SiO2 into molten slag, where the rate-controlling step is regarded as mass transfer of 2CaO·SiO2 in the slag phase.1–3) To promote the dissolution of lime, elevation of temperature is a key factor because the solubility of 2CaO·SiO2 would greatly depend on the temperature and increase with its elevation. For proper understanding of thermal condition regarding lime dissolution, thermal conductivity of 2CaO·SiO2 is the most essential information. With this information, heat conduction from molten slag to solid lime would be appropriately understood. Nowadays, as the novel method for promotion of the lime dissolution, much attention has been paid and favorable result has been reported on the utilization of the gaseous phase generThermal Conductivity of 2CaO·SiO2 Bearing Solid Solution

Thermal Conductivity of 2CaO·SiO<sub>2</sub> Bearing Solid Solution