Benchmarking: Meadowbank ball mill model

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Benchmarking: Ball Mill Power Draw - Meadowbank

  • Muteb, P. & Allaire, J., Meadowbank Mine Process Plant Throughput Increase, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013.

The ball mill design given as:

  • Diameter inside shell: 18 ft
  • Length (assumed to be flange-to-flange length): 29 ft
  • Effective grinding length: 28.5 ft (using rule-of-thumb half-foot basis)
  • Motor size: 6,000 horsepower (4,474 kW)
  • Overflow mill with synchronous motor assumed

The operating conditions of the May 2012 survey, including the pre-crushing circuit given as:

  • Mill speed 14.19 rpm (75% critical)
  • Volumetric filling 30.6% v/v
  • Ball charge 30.6% v/v
  • Ore density 2.93 kg/L
  • Grindability: A×b 38.6; WiBM 10.9 kWh/t

Liners assumed to be an effective thickness of 3 inches. DCS power is assumed to be indicated (mill power measurements × 0.985 pinion × 0.96 motor eff equals power "at mill shell"). Model power measurements are shown "at DCS".

DCS Power, kW Mill filling Morrell Model, kW Nordberg model, kW
May 2012 4,341 30.6% v/v 4,765 (+9.3%) 4,423 (+1.9%)