Abstract
Flash smelting is one of the major primary heat treatment processes in copper smelting. The overall reaction of the process is the oxidation of the sulfide copper concentrates by oxygen-enriched process gas, meanwhile, overoxidation, reduction, and sulfidation reactions coincide due to the inhomogeneous reactions and various feeds, such as recycling materials. This study focused on the sulfidation of metallic copper in flash smelting furnace conditions to investigate its reaction rate and mechanisms. Metallic copper samples and copper concentrates were heated in a furnace. The quenched samples were evaluated considering the influence of temperature, sulfur partial pressure, and reaction time.