View source for Benchmarking: Meadowbank ball mill model

[[category:Benchmarking]]
[[category:Bibliography]]
==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&times;b 38.6; Wi<sub>BM</sub> 10.9 kWh/t

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

{| class="wikitable" border="1"
|-
! 
! DCS Power, kW
! Mill filling
! Morrell Model, kW
! Nordberg model, kW
no density correction
! Nordberg model, kW
density correction
|-
| May 2012
| 4,341
| 30.6% v/v
| 4,765 (+9.3%)
| 4,426 (+1.9%)
| 4,753 (+9.5%)
|}