In Japanese steelworks, hot metal is now being produced by a scrap melting process. With this process, removals of sulphur is very much handicapped because of very high sulphur levels (0.04‐ to 0.09‐ pct by weight) and relatively low tapping temperatures (1623 to 1723 K). In order to overcome such handicaps, the authors explored on the respective phase diagrams. These explorations revealed that {CaO‐SiO2‐Al2O3‐MgO} slags with Al2O3 contents of 30‐ to 35‐pct by weight would be good candidates as reagents for sulphur removal from high sulphur hot metal at relatively low temperatures. For better understanding of the thermodynamic properties of the candidate slags, in this study, sulphide capacities were determined through gas/slag equilibrium technique. The experimental results suggest that there would be, at least, a “window” to remove sulphur from high sulphur hot metal as relatively low temperatures.

In Japanese stee lworks , hot metal is now produced by scrap melting process . With this process removal of sulp hur is very much hand icapped because of very high sulphur levels (0.04 to 0.09 pet by weight) and relat ively low tapping temperatures (1623 to 1723 K). In order to overcome such disadvantages, the authors explored on the phase diagrams of {CaO-Si0 2-AI203-MgO} slags, and this research revealed that those slags at 35 wt%-A1 203 would be good candidates as reage nts for the removal of sulphur from high sulphur hot metal at relatively low temperatures. For better understanding of the thermodynamic properties of the cand idate slags, in this study, activities of FexO were determ ined by using solid-state electrochemical cells incorporating MgO-stabilized zirconia and Mo + Mo0 2 reference electrode.Keywords: hot metal , scrap melt ing, high sulphur contents, removal of sulphur, thermodynam ic properties of slag , sol id-state electrochem ical cells.

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