Get efficient heat recovery, sulfuric acid production, and excellent metals recovery with Outotec's pyrite roasting solutions.
Generates steam or power without CO₂ emissions
Produces sulfuric acid
Recovers valuable metals such as gold, zinc, copper, and cobalt
Pyrite roasting, most commonly known as dead roasting process and is mainly used in our zinc and pyrite roasters. 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 800 and 900°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. For gold roasting applications, even low-sulfur and organic contents are removed efficiently, leading to increased gold recovery in the downstream leaching process.
Direct dry feeding of the concentrate (moisture content 6–12%) to the roaster
Suitable for roasting sulfidic concentrates with a wide range of chemical and physical compositions
High-capacity plants with a throughput of up to 1,500 metric tons per day
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