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Grinding Media Size Evaluation

Size Matters


Ball mill grinding efficiency is directly influenced by the size distribution of the grinding balls in the mill. However, determining the ball size (or sizes) that should be added to a plant ball mill to obtain optimal performance is a difficult task. Metcom Technologies has developed a specialized method for designing ball charges to best suit the characteristics of a given ore and circuit performance requirements. When applied, the economic benefits have often proven to be substantial with no capital cost!

The media size evaluation process makes use of a comprehensive database consisting of numerous tests and plant data. This is used in conjunction with your plant information to create a customized grinding media test program. The evaluation process is typically divided into two phases.

1) Scoping Study and Customized Test Planning ($3,495)

Prior to beginning the media size pilot test work, a detailed plan must be developed. This ensures that the right tests will be conducted and all plant-specific requirements are addressed. Phase 1 includes the following deliverables:

  • Detailed sample collection instructions and sample collection containers
  • An analysis of the provided samples
  • Interpretation of current media performance from sample analysis
  • A comparative database review of other plants and media size pilot tests
  • A preliminary estimate of potential grinding performance improvement through media sizing
  • A customized media size improvement pilot test program developed for your specific operation

2) Pilot Scale Torque Mill Test Program

This phase consists of conducting tests using different media size charges in our pilot-scale instrumented torque mill. The custom test program uses samples collected from your operation and evaluates the performance of a variety of potential media size charges. The results of these tests are then interpreted and a detailed report is provided, complete with media charging practice recommendations for the plant. The cost for this test work and analysis is dependent on the number of tests required as determined in phase one.

Torque Mill

Our media size testing facilities include a torque instrumented pilot-scale test mill, a large inventory of graded media charges for both mixed and single size charging practices, and all needed support and analysis laboratory equipment.


For a quotation or further details contact us:
phone: (906) 273-1300

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