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  Grinding Media Wear Rate  
  (For 2 chambers mills)              
                   
    Date            
    Company/Plant        
    Mill N°            
    Mill shell diameter m          
    Analysis of the first chamber:              
    Length of chamber 1 m          
    Initial ball charge for chamber 1              
    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 %      
    Chamber 1 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 in chamber 1 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 (2) mm          
    (2) Balls which have to been removed of the chamber            
    Ball specific gravity kg/dm3          
    Ball charge surface at the equilibrium              
    m2          
    m2          
    m2          
    m2          
    m2          
    m2          
    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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    Analysis of the second chamber:              
    Length of chamber 2 m          
    Initial ball charge for chamber 2              
    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 %      
    Chamber 2 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 h          
    Average output t/h          
    Average specific power consumption kwh/t          
    Measured volume load %          
    Ball charge in chamber 2 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 (3) mm          
    (3) Balls which have to been removed of the chamber            
    Ball specific gravity kg/dm3          
    Ball charge surface at the equilibrium              
    m2          
    m2          
    m2          
    m2          
    m2          
    m2          
    m2          
    m2          
    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