Phase equilibria in ferrous calcium silicate slags: Part IV. Liquidus temperatures and solubility of copper in "Cu2O"-FeO-Fe2O3-CaO-SiO2 slags at 1250 °C and 1300 °C at an oxygen partial pressure of 10(−6) atm

Liquidus temperatures and the solubility of copper oxide in slag are evaluated and discussed for the ferrous calcium silicate system (described by the "CuO"-FeO-FeO-CaO-SiO system). The solubility of copper in this system was interpolated into the fully liquid region by fitting the experimental values to a second-power polynomial in terms of CaO/SiO and SiO/Fe compositional parameters. The industrial application of this slag system for copper converting is discussed and optimal slag compositions are defined that ensure one stable liquid phase over the range of temperatures at the oxygen partial pressure of 10 atm. The copper oxide solubilities in iron-silicate, ferrous calcium silicate, and calcium ferrite slags are compared at fixed conditions relevant to copper converting