Difference between revisions of "Benchmarking: Ball Mill Power Draw Models"

Revision as of 01:36, 27 January 2013

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

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

	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%)

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 * ''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".
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