If deposits of zinc carbonate, zinc silicate, or zinc-spinel (like the Skorpion Deposit in Namibia) are used for zinc production, the roasting can be omitted.For further processing two basic methods are used: pyrometallurgy or electrowinning. Pyrometallurgy reduces zinc oxide with carbon or carbon monoxide at 950 °C (1,740 °F) into the metal, which is distilled as zinc vapor to separate it from other metals, which are not volatile at those temperatures. The zinc vapor is collected in a condenser.
2
          
          
            ZnSO
            
              4
            
            
              
            
          
          +
          2
          
          
            H
            
              2
            
            
              
            
          
          O
          ⟶
          2
          
          Zn
          +
          
            O
            
              2
            
            
              
            
          
          +
          2
          
          
            H
            
              2
            
            
              
            
          
          
            SO
            
              4
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {2ZnSO4 + 2H2O -> 2Zn + O2 + 2H2SO4}}}
  The sulfuric acid is regenerated and recycled to the leaching step.