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      Pre-grinding systems        
                   
      3   Roller Press (suite 1)        
         3.4 General representation:        
        - The schema below shows the main components of the roller press:    
         
     
           
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
        - The main components are:        
          1. Electric motor (2x)        
          2. Drive shaft (2x)        
          3. Planetary gearbox (2x)        
          4. Hydraulic cylinder (2x or 4x)        
          5. Batteries nitrogen (2x)        
          6. movable roller        
          7. Fixed roll        
          8. cylindrical bearing (2x)        
          9. Feed hopper        
          10. Dosing device        
        - Components not shown in the diagram:        
          * A frame        
          * A hydraulic kit including motor, valves, pumps and tank      
          * A press dust removal system        
          * A feed measuring system        
         3.5 Methods of use and types of circuits:        
        - Roller presses may be used in a configuration of:      
          * Pre-grinding        
          * Semi-finished grinding        
          * Integral grinding        
        - The pre-grinding configuration can be divided into 2 solutions:      
          * Open circuit        
          * Recirculation of cakes        
        - The configuration in semi-finished grinding can be divided into 2 solutions:    
          * Press and mill in closed circuit        
          * Press in closed circuit and mill in open circuit      
        - Here below are simplified flowsheets of these configurations:      
         3.5.1 Pre-grinding - Open circuit        
         
     
         
               
               
               
               
               
               
               
               
         3.5.2 Pre-grinding - Recirculation of cakes        
         
     
         
               
               
               
               
               
               
               
               
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         3.5.3 Semi-finished grinding - Press and mill in closed circuit      
         
     
         
               
               
               
               
               
               
               
               
         3.5.4 Semi-finished grinding - Press in closed circuit and mill in open circuit    
         
     
         
               
               
               
               
               
               
               
               
         3.5.5 Integral grinding - Press in closed circuit        
         
     
         
               
               
               
               
               
               
               
               
        - Other systems have emerged in recent years like the Comflex system of KHD Humbolt, but they will not be
          discussed in this presentation.        
        - Also, the integral grinding solution will not longer be discussed because it is not strictly a pre-grinding solution.
        - On the next page, we can see the flow-sheets of the two most used circuits.    
                   
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