Metso Full portfolio Zinc Roasting
Get efficient heat recovery, sulfuric acid production, and excellent metals recovery with Metso's Zinc roasting solutions.
  • Steam or power generation without CO2 emissions
  • Sulfuric acid production
  • Recovery of valuable metals such as gold, zinc, copper, and cobalt
Zinc roasting

Zinc 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 860 and 960°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.

  • 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 1,000 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    

Typical composition

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