Difference between revisions of "Benchmarking: Ball Mill Power Draw Models"
(→Benchmarking: Ball Mill Power Draw - Fimiston) |
(→Benchmarking: Ball Mill Power Draw - Meadowbank) |
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* Diameter inside shell: 18 ft |
* Diameter inside shell: 18 ft |
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* Length (assumed to be flange-to-flange length): 29 ft |
* Length (assumed to be flange-to-flange length): 29 ft |
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| − | * Effective grinding length: 28.5 ft ( |
+ | * Effective grinding length: 28.5 ft (using rule-of-thumb half-foot basis) |
| − | * Motor size: horsepower ( kW) |
+ | * Motor size: 6,000 horsepower (4,474 kW) |
| − | * Overflow mill assumed |
+ | * Overflow mill with synchronous motor assumed |
The operating conditions of the May 2012 survey, including the pre-crushing circuit given as: |
The operating conditions of the May 2012 survey, including the pre-crushing circuit given as: |
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| Line 55: | Line 55: | ||
! Mill filling |
! Mill filling |
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! Morrell Model, kW |
! Morrell Model, kW |
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| − | ! |
+ | ! Nordberg model, kW |
| − | ! Austin model, kW |
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|- |
|- |
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| May 2012 |
| May 2012 |
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| 4,341 |
| 4,341 |
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| 30.6% v/v |
| 30.6% v/v |
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| − | | ( |
+ | | 4,765 (+9.3%) |
| − | | (+ |
+ | | 4,423 (+1.9%) |
| − | | (-3.0%) |
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|} |
|} |
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Revision as of 00:01, 27 January 2013
Benchmarking: Ball Mill Power Draw - Fimiston
- Nelson, M; Valery, W; Morrell, S, Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit, Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.
| Survey | Survey Power, kW at input |
Mill speed, %critical |
Total load, %v/v |
Pulp %solids, w/w |
Morrell SAG Model, kW at input / shell |
Nordberg Model, kW at input / shell |
|---|---|---|---|---|---|---|
| Survey 1 | 3,864 | 68.3 | 38.7 | 72.0 | 3,933 / 3,776 | 3,592 / 3,345 |
- Morrell model predicts 2% high
- Nordberg model predicts 7% low
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%) |
