Metso Full portfolio Gold Concentrate Roasting
Gold Concentrate Roasting

Gold Concentrate Roasting

Get efficient heat recovery, sulfuric acid production, and excellent metals recovery with Metso's gold concentrate 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 Metso'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    

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