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Phase equilibrium and thermodynamic experimental data in the Cu 2 O – SiO 2 , Cu 2 O – CaO, and Cu 2 O – CaO – SiO 2  systems in equilibrium with metallic copper have been critically reviewed. The Modified Quasichemical and Bragg–Williams models in the FactSage computer package were used to describe the Gibbs energy of the molten slag phase as a function of composition and temperature. The available data have been used to optimize simultaneously a set of parameters in thermodynamic model equations for the Gibbs energy of liquid slag. The present thermodynamic optimization was carried out as part of the development of a thermodynamic database of copper-containing slag systems.

Thermodynamic modelling of the “Cu 2 O”–SiO 2 , “Cu 2 O”– CaO, and “Cu 2 O”– CaO – SiO 2 systems in equilibrium with metallic copper