The equations below describe this process:

  
    
      
        
          ZnO
          +
          C
          
            
              →
              
                
                  950
                  o
                
                C
              
            
          
          Zn
          +
          CO
        
      
    
    {\displaystyle {\ce {ZnO + C ->[950^oC] Zn + CO}}}
  

  
    
      
        
          ZnO
          +
          CO
          
            
              →
              
                
                  950
                  o
                
                C
              
            
          
          Zn
          +
          
            CO
            
              2
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {ZnO + CO ->[950^oC] Zn + CO2}}}
  In electrowinning, zinc is leached from the ore concentrate by sulfuric acid and impurities are precipitated:

  
    
      
        
          ZnO
          +
          
            H
            
              2
            
            
              
            
          
          
            SO
            
              4
            
            
              
            
          
          ⟶
          
            ZnSO
            
              4
            
            
              
            
          
          +
          
            H
            
              2
            
            
              
            
          
          O
        
      
    
    {\displaystyle {\ce {ZnO + H2SO4 -> ZnSO4 + H2O}}}
  Finally, the zinc is reduced by electrolysis.
Ismo may refer to:

-ism in Spanish, Portuguese, Esperanto and Italian
Ismo, a brand name for isosorbide mononitrate
Ismo Leikola, Finnish comedian