Dynamic in situ X‐ray observation of a molten steel drop shape change in molten slag

Abstract

In the present work, the interfacial reactions between molten synthetic slag (Al2O3–CaO–SiO2–FeO) and liquid iron alloy were investigated at 1873 K with the aid of an X‐ray radiographic apparatus. The mother slag consists of 40 mass%CaO, 40 mass%SiO2 and 20 mass%Al2O3. FeO was added to this slag at the experimental temperature, and the movement of the droplet and deformation of the droplet shape were monitored in the dynamic mode. The change of the shape of the droplet is discussed based on the reaction and mass transfer at the slag/metal interface. From the movement of the droplet, interfacial velocity of the metal droplet induced by Marangoni flow was estimated and compared with the results obtained in the present laboratory earlier. The importance of surface velocity values on steel refining process simulations is discussed.