Sulphide Capacities of "FeO"-SiO2, CaO-"FeO", and "FeO"-MnO Slags

In view of the lack of sulphide capacity data for iron oxide-bearing slags that are of great importance in metallurgical processes, the present work was initiated to study the sulphide capacities of FeO-SiO 2 , FeO-CaO, and FeO-MnO melts. The melts were equilibrated with a gas mixture of CO, CO 2 , SO 2 and Ar with known sulphur and oxygen partial pressures in the temperature range of 1 623 to 1 873 K. The quenched slag samples were analysed for sulphur contents by the stoichiometric combustion method. Chemical analyses were also carried out to determine the chemical composition of the slag in view of the dissolution of iron and manganese from the slag into the platinum containers. The experimental results were compared with those obtained by other investigators and the thermodynamic aspects are discussed. On the basis of a sulphide capacity model developed in the present laboratory, the sulphide capacities in these three binary systems have been described as functions of temperature and composition.