Evaluation of the sulphide capacity of Na₂O-containing silicate slags using a structural model

ABSTRACT

This article suggests that the sulphide capacity may be a unique property of slag that can be calculated at a given temperature and composition, even for CaO- or Na₂O-containing slags where the amount of dissolved sulphides is significant. A structural model that incorporates sulphide ions (S²⁻) in the silicate network is used to calculate the sulphide capacity of SiO₂-Na₂O binary and SiO₂-Na₂O-MO (M = Ca, Mg, Mn, Fe) ternary systems. This structural model considers the effect of substituting one metal oxide for another in ternary systems and uses only the data for the binary subsystems without any ternary adjustable parameter.

KEYWORDS:

• Sodium oxide-containing slags
• sulphide capacity
• thermodynamic model

Acknowledgments

The authors wish to thank the National Council for Science and Technology (CONACYT), National Polytechnic Institute (IPN) and the Researcher National System (SNI) for the support of this research.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to gratefully acknowledge the financial support by the Instituto Politécnico Nacional of México.