Thermodynamic modelling of sulphide capacity of ternary silicate slags

Antonio Romero-Serrano, Josué López-Rodríguez, Aurelio Hernández-Ramírez, Alejandro Cruz-Ramírez, Enrique Rivera-Salinas, Miguel Pérez-Labra

Research output: Contribution to journalArticlepeer-review


This article proposes a structural thermodynamic model of slags to estimate the sulphide capacity (CS) of ternary silicate melts. Sulphide ion (S2−) is incorporated into the silicate structure by substituting quasi-lattice sites in the slag for free oxygen ions (O2−). This structural model can take into account the effect of substituting one metal oxide for another in ternary systems, since it considers that each metallic oxide produces a de-polymerisation reaction of O° + O2− = 2 O with a characteristic free energy change. The Cs of ternary silicates can be calculated by this model solely from the data of the binary sub-systems − no ternary terms are required. A good agreement was obtained between the experimental and the model results for the ternary slags of the SiO2–CaO–MgO–MnO–FeO system.

Original languageEnglish
Pages (from-to)1768-1774
Number of pages7
JournalISIJ International
Issue number6
StatePublished - 2021


  • Silicate slag
  • Sulphide capacity
  • Thermodynamic model


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