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  Grinding Media Wear Rate  
  (For monochamber mills)              
                   
    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 Cement Grinding Office