RI 6769 The Thermodynamic Properties Of The ZnO-Fe2O3-Fe3O4 System At Elevated Temperatures (In Two Parts) 2. The Thermodynamic Properties as Related to Zinc Concentrate Roasting

A compound stability diagram was constructed by the Bureau of Mines for the Zn-Fe-S-O system to show the phases that should be thermodynamically stable at various temperatures, oxygen pressures, and SO2 pressures. The diagram was demonstrated to have good qualitative value for predicting stable phases that may, in turn, be related to the recovery of zinc in the leaching phase of the electrolytic zinc process. The study showed that roasting temperature is the most Significant variable in preventing roaster formation of zinc ferrite, which is directly related to subsequent extraction of zinc in the leaching step.