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      Ball Charges Composition              
      (For cement mill 2 chambers)              
                     
      Date           No separator
      Company   First generation
      Cement plant   Second generation
      Mill N°         Third generation
                     
      Type of circuit  
          Open  
      Kind of separator  
        Closed  
                     
      Mill diameter   m        
      Mill length   m       Clinker
      L/D ratio           White clinker
      Speed   rpm       Alumina clinker
      Critical speed   rpm       Gypsum
      % of the critical speed   %       Anhydrite
                    Limestone
      Cement type (1)     Pozzolana
      (1) If various cements are produced, choose the cement with the highest output (t/h) rate or the cement the most  Trass
      important or having the highest production (tons/year) rate.     Slag
      Total mill's output   t/h       Fly ash
      Composition of the alimentation: Percentage:   Moisture:     Limestone filler
     
      % %
     
      % %
     
      % %
     
      % %
     
      % %
      Total   % %    
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      Real mill's output (2)   t/h        
      (2) It is the total output less the fly ash/limestone filler fraction      
      (2) We consider that fly ash and limestone filler don't need to be crushed in the 1st chamber and/or are directly
      introduced after the mill              
      Granulometry fresh feed (3):      
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      Residue cumulated on 20mm   %    
      Residue cumulated on 8mm   %    
      Residue cumulated on 4mm   %    
      Residue cumulated on 2,5mm   %    
      (3) Total fresh feed (all the componants)          
      (3) Granulometry after pre-grinding system if it exists!        
      Clinker hardness (4)   cm        
      (4) Hardness of reference is Slegten hardness which is probably the most well-known and used in the world. To know 
      better about this test, go to: http://www.thecementgrindingoffice.com/hardness.html  
      (4) Typical values of the Slegten hardness test:          
     
     
           
             
             
             
             
             
      (4) A majority of clinkers has a hardness around 120        
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      Chamber 1:              
      Useful length   m        
      Kind of lifting lining  
             
      Average thickness of lining   mm   Weak  
      Volume load   %   Normal  
      Tonnage of balls   t   Agressive  
      Absorbed power of chamber 1   kW      
      Specific power consumption (5)   kWh/t        
      (5) The specific power consumption is generally comprised between 9 and 12 kWh/t. If there is a pre-grinding system,
      this value can be reduced. For white cement, a value close to 8 kWh/t is widely accepted. At the contrary, the value
      must be close to 12 kWh/t for alumina cement.      
      (5) The specific power consumption is calculated with the real mill's output (without fly ash and/or limestone filler)
      Grinding media wear chamber 1    gr/t      
      Mill running hours/year   h        
                     
      Composition of the charge of chamber 1:           
      Accept ball with 100mm diameter
             
      Accept ball with 60mm diameter
      Yes      
      Accept ball with 50mm diameter
      No   Make-up  
      Diameter 100mm   t    or % %
      Diameter 90mm   t    or % %
      Diameter 80mm   t    or % %
      Diameter 70mm   t    or % %
      Diameter 60mm   t    or % %
      Diameter 50mm   t    or % %
      Total   t    or % %
                     
      Average weight   gr/ball        
      Balls number            
      Surface of the ball charge   m2        
      Surface by ton of balls   m2/t        
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      Chamber 2:              
      Useful length   m     Classifying  
      Type of lining  
          Not classifying  
      Average thickness of lining   mm      
      Volume load   %      
      Tonnage of balls   t       
                     
      Fineness at chamber 2 inlet Blaine (cm2/gr)    
      Fineness at chamber 2 outlet Blaine (cm2/gr)    
      Barrage (dam) (6)   %        
      (6) The barrage or dam is useful only in case of classifying lining. This barrage consists of balls of diameter 60, 50 and 40mm.
      (6) These balls at the beginning of the chamber allow to crush the last particles of 5-6mm going from the first chamber.
      (6) The part of the dam is normally 10-15% of the tonnage of the chamber 2 ball charge.
      Grinding media wear chamber 2    gr/t        
      Mill running hours/year    h        
                     
      Composition of the charge of chamber 2:           
      Accept ball with 60mm diameter
              
      Accept ball with 30mm diameter (7)
              
      (7) Only in case of not classifying lining           Make-up  
      Diameter 60mm   t    or % %
      Diameter 50mm   t    or % %
      Diameter 40mm   t    or % %
      Diameter 30mm   t    or % %
      Diameter 25mm   t    or % %
      Diameter 20mm   t    or % %
      Diameter 17mm   t    or % %
      Diameter 15mm   t    or % %
      Total   t    or % %
                     
      Average weight   gr/ball        
      Balls number            
      Surface of the ball charge   m2        
      Surface by ton of balls   m2/t        
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      Similar composition in case of cylpebs (8):          
      (8) Only if there is not a barrage and without classifying lining Make-up  
      24 x 24 mm   t    or % %
      20 x 20 mm   t    or % %
      16 x 16 mm   t    or % %
      12 x 12 mm   t    or % %
      Total   t    or % %
                     
      Average weight   gr/cylpebs      
      Cylpebs number            
      Surface of the grinding charge   m2        
      Surface by ton of cylpebs   m2/t        
                     
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