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      Grinding technology of limestone with ball mills
             
      4. Different types of mills and circuits:
             
      4.1. Classical ball mill circuit:  
      See typical flow-sheet herebelow:  
     
     
         
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
      Main characteristics:    
       - Ball mill with 2 compartments  
       - L/D = 3      
       - Closed circuit with bucket elevator  
       - Dynamic separator of 1st, 2nd or 3rd generation
       - Filter (Bag or EP)    
       - Granulometry of fresh feed: normally 35-40mm
       - Moisture of fresh feed: maximum 1%H2O
      This is the circuit to grind fine product.
      4.2. Air-swept mill circuit:  
      See the flow-sheet herebelow:  
     
     
         
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
      Main characteristics:    
       - Ball mill with 1 or 2 compartments   
      * 1 compartment = 1 grinding chamber  
      * 2 compartments = 1 drying and 1 grinding chamber
       - L/D = 2-2.5 (short mill)    
       - Closed circuit with pneumatic system
       - Static separator and cyclones For cleaning
       - Filter (mainly The kiln Filter which is an EP Filter)
       - Granulometry of fresh feed: 5%R30mm (residue between 30 and 40mm)
       - Moisture of fresh feed: maximum 8%H2O with gas kiln at 350°C (15% if additional heater-temperature 600°C)
      Without drying chamber: 4-6%H2O  
       - Power requirements for pneumatic conveying: 4-6 kWh/t
      This is one of the circuits used in the cement plants to grind the raw material .
      This circuit is recommended in case of big moisture content and for a fineness of the product around 20%R90m.
      4.3. Birotator circuit:    
      See the flow-sheet herebelow:  
     
     
         
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
      Main characteristics:    
       - Ball mill with 3 compartments: 1 drying and 2 grinding
       - L/D = more than 3    
       - Peripheral discharge (2 feeds)  
       - Closed circuit with Static separator For gas and Dynamic separator For material
       - with bucket elevator    
       - Filter (mainly The kiln Filter which is an EP Filter)
       - Granulometry of fresh feed: maximum 50 to 80mm
       - Moisture of fresh feed: maximum 7%H2O with gas kiln at 350°C (15% if additional heater)
             
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