Shell liners in medium grinding

Grinding mechanism by cascading

In coarse to medium grinding, the particle size reduction is mainly made inside the ball charge. Trajectories must allow the material to enter the ball charge made of grinding media big enough to reduce it.

The design will depend on:

  • Drilling pattern on mill shell
  • Mill speed (rpm)
  • Maximum grinding media diameter (mm)
  • Grinding media filling degree (%)

Key benefits:

  • Optimum compromise between lifetime and grinding efficiency
  • Continuous optimization of the liner profile via wear profile studies
  • Ease of installation process (filler ring and handling system)
  • Anti-pulp racing design to avoid pulp circulation
  • Design to minimize the number of plate/liner models
  • Design to minimize grinding media consumption
Shell liners in medium grinding
  • Primary and secondary ball mills
  • Rod mills
  • Specific MVL (Magotteaux Variable Lift) design type have been developed by Magotteaux with to goal to maintain the liner profile and therefore the grinding efficiency all along the lifetime of the liner.
  • The alloy choice for the liner will depend on operating conditions of the mill, the expected lifetime and the cost
  • Liners can be manufactured either in Chrome-Moly (FMU226 type) or in High-Chrome (FMU41, 40, 49)
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