Benchmarking: Ball Mill Power Draw Models

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, no density correction kW at input / shell	Nordberg Model, density correction kW at input / shell
Survey 1	3,864	66.7 68.4 †	38.7	72.0	3,798 / 3,798	3,619 / 3,370	3,894 / 3,626

• Morrell model predicts 2% high
• Nordberg model predicts 7% low with no density correction and 0.8% high with density correction.

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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.

	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%)

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Benchmarking: Ball Mill Power Draw - Santa Rita

• Latchireddi, S. & Faria, E., Achievement of High Energy Efficiency in Grinding Mills at Santa Rita, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013.
• Faria, E. & Latchireddi, S., Commissioning and Operation of Milling Circuit at Santa Rita Nickel Operation, Paper #137: Proceedings of the International Autogenous Grinding, Semiautogenous Grinding and High Pressure Grinding Roll Technology Conference, Vancouver, Canada, September 2011.

	DCS Power, kW	Mill filling	Morrell Model, kW	Nordberg model, kW (no density correction)	Nordberg model, kW (density correction)
July 2010	5085	27.5% v/v	4979 (-2.1%)	4706 (-8.1%)	5083 (0.0%)

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Benchmarking: Ball Mill Power Draw - Collahuasi

• Villouta, R.M., Collahuasi: After years of operation, Proceedings of the International Autogenous and Semiautogenous Grinding Technology conference (SAG 2001), Vancouver, Canada, Pages I-31 – I-42

	DCS Power, kW	Speed, % of critical	Mill filling	Morrell Model, kW	Nordberg model, kW (no density correction)	Nordberg model, kW (density correction)
original	8900	74%	35% v/v	9044 (+1.6%)	[deduct 5%] 8183 (-8.8%)	[deduct 5%] 8717 (-2.1%)
later	9200	78%	35% v/v	9655 (+4.9%)	[deduct 5%] 8890 (-3.5%)	[deduct 5%] 9471 (+2.9%)

All power values relative to DCS.

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