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      Grinding Media Wear Rate  
      (For monochamber mills, SAG mills excluded)            
                       
        Date            
        Company/Plant        
        Mill N°            
        Mill shell diameter m          
        Analysis :              
        Length of chamber m          
        Initial ball charge              
        Diameter 100mm t            or %      
        Diameter 90mm t            or %      
        Diameter 80mm t            or %      
        Diameter 70mm t            or %      
        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 %      
        Wear rate calculations:              
        Initial volume load %        
        Production data between initial situation and wear rate calculation:          
        Average absorbed power of the mill kW        
        Tonnage of cement producted t        
        Running hours (1) h        
        (1) From the initial situation            
        Average output t/h          
        Average specific power consumption kwh/t          
        Measured volume load %          
        Ball charge tonnage t          
        Wear rate:              
        Tons of balls consumed t          
        Wear rate in gr/t gr/t          
        Wear rate in gr/kWh gr/kWh          
        Minimum ball diameter permitted (1) mm          
        (2) Balls which have to been removed of the chamber            
        Ball specific gravity kg/dm3          
        Ball charge surface at the equilibrium            
        m2 100    
        m2 90    
        m2 80    
        m2 70    
        m2 60    
        m2 50    
        m2 40    
        m2 30    
        m2 25    
        m2 20    
        m2 17    
        m2 15,01    
        Total m2        
        Wear rate in mm/100hours mm/100h          
        Wear rate in mm/tons produced mm/1000tons produced        
        Hours required for the smallest ball to reach the minimum ball diameter permitted hours    
                       
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    All rights reserved © 2012-2015 The Mining Grinding Office