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      Hogg and Fuerstenau formula        
      (For monochamber mill)        
                    #
      Date           #
      Company/Plant   #
      Mill N°     #
                    #
      Mill diameter m         #
      Lining average thickness  mm         #
      Internal diameter m         #
      Useful length m         #
      Length/Diameter ratio           #
      Speed rpm         #
      Critical speed rpm         #
      % of the critical speed %         #
      Volume load (Filling degree) %         #
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration! #
     
     
                #
      Correlation %          
                     
      Balls density t/m3           
      Tonnage of balls t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle will be between 30° and 35° if there is a lifting lining          
      (*) Lift angle will be between 20° and 30° if there is a classifying lining          
      Absorbed power at mill shell kW          
                     
      Transmission efficiency
    %          
      Motor efficiency
    %          
                     
      Absorbed power at terminals kW          
                     
    www.thecementgrindingoffice.com
      Hogg and Fuerstenau formula        
      (For 2 chambers mill)        
                     
      Date            
      Company/Plant    
      Mill N°      
                     
      Mill diameter            
      Speed            
      Critical speed            
      % of the critical speed            
                     
      Chamber 1:              
      Lining average thickness  mm          
      Internal diameter m          
      Useful length chamber 1 m          
      Volume load (Filling degree) %          
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration!  
     
     
                  
      Correlation %          
      Balls density t/m3           
      Tons of balls chamber 1 t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle is generally between 30° and 35° for the coarse chamber of a ball mill          
     
     
     
      Absorbed power at mill shell kW for chamber 1          
                     
      Chamber 2:              
      Lining average thickness  mm          
      Internal diameter m          
      Useful length chamber 2 m          
      Volume load (Filling degree) %          
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration!  
     
     
                  
      Correlation %          
      Balls density t/m3           
      Tons of balls chamber 2 t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle is generally between 20° and 30° for the fine chamber of a ball mill          
     
     
     
      Absorbed power at mill shell kW for chamber 2          
      Absorbed power at shaft kW for mill          
      Transmission efficiency
    %          
      Motor efficiency
    %          
      Absorbed power at terminals kW for mill          
    www.thecementgrindingoffice.com
      Hogg and Fuerstenau formula        
      (For 3 chambers mill)        
                     
      Date            
      Company/Plant    
      Mill N°      
                     
      Mill diameter            
      Speed            
      Critical speed            
      % of the critical speed            
                     
      Chamber 1:              
      Lining average thickness  mm          
      Internal diameter m          
      Useful length chamber 1 m          
      Volume load (Filling degree) %          
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration!  
     
     
                  
      Correlation %          
      Balls density t/m3           
      Tons of balls chamber 1 t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle is generally between 30° and 35° for the coarse chamber of a ball mill          
     
     
     
      Absorbed power at mill shell kW for chamber 1          
                     
      Chamber 2:              
      Lining average thickness  mm          
      Internal diameter m          
      Useful length chamber 2 m          
      Volume load (Filling degree) %          
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration!  
     
     
                  
      Correlation %          
      Balls density t/m3           
      Tons of balls chamber 2 t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle is generally between 20° and 30° for a flat lining          
     
     
     
      Absorbed power at mill shell kW for chamber 2          
                     
      Chamber 3:              
      Lining average thickness  mm          
      Internal diameter m          
      Useful length chamber 3 m          
      Volume load (Filling degree) %          
      Find the angle θ to get 99,99% correlation °                 -----------------------> It is an iteration!  
     
     
                  
      Correlation %          
      Balls density t/m3           
      Tons of balls chamber 3 t           
      Specific gravity of the material t/m3          
      Material level
             
      How many millimeters? mm (above or below)          
      Tonnage of material between balls t           
      Volume of charge m3          
      Bulk density of material t/m3          
      Apparent density of the charge t/m3          
      Lift angle (*) °          
      (*) Lift angle is generally between 20° and 30° for the fine chamber of a ball mill          
     
     
     
      Absorbed power at mill shell kW for chamber 3          
                     
      Absorbed power at shaft kW for mill          
                     
      Transmission efficiency
    %          
      Motor efficiency
    %          
                     
      Absorbed power at terminals kW for mill          
                     
    www.thecementgrindingoffice.com
    All rights reserved © 2012-2015 The Cement Grinding Office