Get efficient heat recovery, sulfuric acid production, and excellent metals recovery with Outotec's gold roasting solutions.
Recovers valuable metals such as gold, zinc, copper, and cobalt
Generates steam or power without CO₂ emissions
Produces sulfuric acid
Gold concentrate roasting, most commonly known as dead roasting, uses Outotec's circulating fluidized bed technology. When using a dead roasting process for concentrates, the sulfides are completely transformed into oxides. The gas temperature in this type of plant is typically between 600 and 700°C. The hot gas generated in the process is used for heat recovery and is suitable for high-pressure steam production in a waste heat boiler. Even low-sulfur and organic contents are removed efficiently, leading to increased gold recovery in the downstream leaching process.
Direct dry or slurry feeding of the concentrate to the roaster
High combustion velocity results in low residual sulfur in the calcine
Maximized heat recovery in the fluidized bed in conjunction with an off-gas waste-heat boiler
Chlorine and fluorine removed from concentrate during roasting