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      CALCULATION OF TOP SIZE GRINDING MEDIA      
      (Fred.C.Bond formula)            
                   
      Use the following formula:            
     
     
             
               
               
               
               
      where:            
      Db = the top size of the grinding media in mm        
      Pf = size in µ of the 80% passing in the fresh feed        
      C = 200 for ball mills            
      Wi = Work index in kWh/sht          
      Vcr = percentage of the critical speed          
      Sgs = specific gravity of feed in t/m3          
      D = internal diameter of mill in m          
                   
      Grinding Media
    choose      
      Mill diameter m        
      Lining average thickness mm        
      Mill internal diameter m        
      Speed of rotation        
      Vcr %        
      C          
      Pf µ        
      Wi kWh/sht        
      Sgs t/m3         
                   
      Db mm        
                   
      Commercial size (*)  
                    
      (*) Available sizes in this calculator:          
      Balls in mm: 125,110,100,90,80,70,60,50,40,30,25        
      Balls in inches: 5,4,3½,3,2½,2,1½,1¼,1          
      Minimum top size = 25mm or 1"          
      Cylpebs in mm: 45×45,40×40,32×32,28×28,24×24        
      For cylpebs: minimum top size = 24×24mm        
                   
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    All rights reserved © 2012-2015 The Cement Grinding Office