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Revision as of 21:13, 19 May 2015
Contents
Benchmarking: Amelunxen SGI Specific Energy Consumption - Agnico Eagle Laronde
Starkey, J., Robitaille, J., Cousin, P., Jordan, J. and Kosick, G., Design of the Agnico-Eagle Laronde Division SAG mill. Proceedings of SAG 2001, pages III-165 to III-178.
Survey conducted shortly after start-up
Design Criteria
Actual operating data, table 7 from the reference
- SAG circuit F80 = 100 mm
- transfer T80 = 244 µm
- circuit P80 = 74 µm
- SAG power draw (at motor input) = 1350 kW (at mill shell = 1283 kW)
- SAG mill ball charge = 10.6 % vol
- SAG mill discharge % solids = 84% weight
- SAG mill speed 8.59 RPM (53.4% of critical)
(to achieve DCS power of 1350 kW requires 14% vol mill load)
- ball mill power draw (sum of 2 mills, at motor input) = 1422 kW (at mill shell = 2 × 673 kW = 1346 kW)
- ball mill % solids = 83% weight
(to achieve 1422 kW, assume 30% vol mill charge, 17 RPM)
Design criteria
- SGI (actually SPI&tm;) of ore (Oct 1, 2000 to - April 30,2001); assumed to be the 25th percentile = 24 minutes.
- WiBM assumed to be 10 kWh/tonne.
- Plant availability = 94.4%
Mill criteria
- SAG mill: 24 foot nom diam by 12 foot effective grinding length (EGL)
- ball mill: two 11 foot nom diam by 17 foot (assumed to be EGL)
- SAG mill single variable speed motor 4500 HP
- Ball mill single fixed speed motors 1000 HP (each mill)
- assume rubber liners in SAG, nominal 8½ inch liner thickness
- assume steel liners in ball mills, nominal 3¼ inch liner thickness
Modelling
The Amelunxen SGI model for SAB circuit is used.
- circuit F80 = 100 mm
- circuit P80 = 74 µm
SAG mill is modelled using following:
- full Morrell SAG grate C-model
- assume ore density 2.7 t/m³
- effective dimensions 6882 mm diam × 3657 mm EGL
Ball mill is modelled using following:
- full Morrell ball mill wet overflow C-model
- assume ore density 2.7 t/m³
- effective dimensions 3186 mm diam × 5181 mm EGL
Results
Result for default Amelunxen SGI SAB model conditions:
| Esag | Epeb | Ebm | Etotal | t/h | |
|---|---|---|---|---|---|
| Predicted | 5.48 | - | 5.77 | 11.24 | |
| Survey | - | ||||
| Difference | - | ||||
| Difference | - |
