INTERFACIAL PHENOMENA IN THE LIQUID COPPER-CALCIUM FERRITE SLAG SYSTEM

The surface and interfacial tensions of the copper-calcium ferrite. sl ag system were determined at 1573 K as a function of oxygen and sulfur pressures and CaO content in the slag. The effect of a 219 mass pct S iO2 addition to the calcium ferrite slag was also investigated. The me asurements were carried out using the sessile drop technique with a hi gh-temperature X-ray setup. The surface tension of copper was found to be a-strong function of oxygen and sulfur partial pressures. The surf ace tension of the calcium ferrite slag decreased slightly with CaO ad dition. On the other hand, CaO had a negligible effect on the interfac ial tension of the system. Surface tension of the slag and the interfa cial tension were influenced by the oxygen partial pressure in the sys tem. Sulfur partial pressure also altered the interfacial tension betw een the copper and the ferrite slag. Based on the experimental data, f ilming and flotation coefficients were calculated to predict the entra inment behavior of copper, by bubble attachment in the ferrite slag.