Difference between revisions of "Benchmarking: Meadowbank ball mill model"
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! Morrell Model, kW |
! Morrell Model, kW |
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! Nordberg model, kW |
! Nordberg model, kW |
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| + | density correction |
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| + | ! Nordberg model, kW |
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| + | no density correction |
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| May 2012 |
| May 2012 |
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| 30.6% v/v |
| 30.6% v/v |
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| 4,765 (+9.3%) |
| 4,765 (+9.3%) |
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| − | | 4, |
+ | | 4,753 (+9.5%) |
| + | | 4,426 (+1.9%) |
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Revision as of 19:49, 26 January 2014
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
density correction |
Nordberg model, kW
no density correction | |
|---|---|---|---|---|---|
| May 2012 | 4,341 | 30.6% v/v | 4,765 (+9.3%) | 4,753 (+9.5%) | 4,426 (+1.9%) |
