Solubility and Activity of Iron Oxide in Solid Solutions between Ca₂SiO₄ and Ca₃P₂O₈ at 1573 K

Abstract

Towards better understanding of fundamental dephosphorization slags of the FeO-CaO-SiO₂-P₂O₅ quaternary system, this study aimed at clarifying the thermochemical properties of iron oxide in Ca₂SiO₄-Ca₃P₂O₈ solid solutions. The solubility and activity of FeO in the solid solutions coexisting with CaSiO₃ at 1573 K were determined by SEM-EDX analysis and a gas equilibrium method, respectively. Based on the present experimental results, the phase relationships could be explained that the solid solution of high FeO solubility coexists with CaSiO₃ and liquid slag of low FeO content, while the solid solution of low FeO solubility coexists with CaO and liquid slag of high FeO content.