Difference between revisions of "Benchmarking: Amelunxen SGI - Agnico Eagle"
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| Line 7: | Line 7: | ||
Survey conducted shortly after start-up |
Survey conducted shortly after start-up |
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| − | ==Design Criteria== |
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Actual operating data, table 7 from the reference |
Actual operating data, table 7 from the reference |
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| + | * Throughput = 210 dry tonnes per hour |
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* SAG circuit F<sub>80</sub> = 100 mm |
* SAG circuit F<sub>80</sub> = 100 mm |
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* transfer T<sub>80</sub> = 244 µm |
* transfer T<sub>80</sub> = 244 µm |
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| Line 16: | Line 16: | ||
* SAG mill discharge % solids = 84% weight |
* SAG mill discharge % solids = 84% weight |
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* SAG mill speed 8.59 RPM (53.4% of critical) |
* SAG mill speed 8.59 RPM (53.4% of critical) |
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| + | * E<sub>SAG</sub> at mill shell = 1283/210 = 6.11 kWh/t |
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(to achieve DCS power of 1350 kW requires 14% vol mill load) |
(to achieve DCS power of 1350 kW requires 14% vol mill load) |
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| − | * ball mill power draw (sum of 2 mills, at motor input) = 1422 kW (at mill shell = 2 × |
+ | * ball mill power draw (sum of 2 mills, at motor input) = 1422 kW (at mill shell = 2 × 674 kW = 1348 kW) |
* ball mill % solids = 83% weight |
* ball mill % solids = 83% weight |
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| − | (to achieve |
+ | (to achieve 1424 kW, assume 30% vol mill charge, 17 RPM) |
| + | * E<sub>bm</sub> at mill shell = 1348/210 = 6.41 kWh/t |
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| + | * ball mill operating Wi<sub>O</sub> relative to motor input = 13.0 kWh/t (= 13.7 kWh/t relative to mill shell) |
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| − | Design |
+ | ==Design Criteria== |
* SGI (actually SPI&tm;) of ore (Oct 1, 2000 to - April 30,2001); assumed to be the 25<sup>th</sup> percentile = 24 minutes. |
* SGI (actually SPI&tm;) of ore (Oct 1, 2000 to - April 30,2001); assumed to be the 25<sup>th</sup> percentile = 24 minutes. |
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* Wi<sub>BM</sub> assumed to be 10 kWh/tonne. |
* Wi<sub>BM</sub> assumed to be 10 kWh/tonne. |
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| Predicted |
| Predicted |
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| − | | |
+ | | 6.5 |
| - |
| - |
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| − | | |
+ | | 6.9 |
| − | | |
+ | | 13.4 |
| − | | |
+ | | 196 |
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|- |
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| Survey |
| Survey |
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| − | | |
+ | | 6.1 |
| - |
| - |
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| − | | |
+ | | 6.4 |
| − | | |
+ | | 12.5 |
| − | | |
+ | | 210 |
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|- |
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| Difference |
| Difference |
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| − | | |
+ | | 0.4 |
| - |
| - |
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| − | | |
+ | | 0.5 |
| − | | |
+ | | 0.9 |
| − | | |
+ | | 14 |
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|- |
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| Difference |
| Difference |
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| + | | model 7% high |
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| − | | |
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| - |
| - |
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| + | | model 8% high |
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| − | | |
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| + | | model 7% high |
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| − | | |
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| + | | model 7% low |
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| − | | |
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Revision as of 20:32, 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
Actual operating data, table 7 from the reference
- Throughput = 210 dry tonnes per hour
- 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)
- ESAG at mill shell = 1283/210 = 6.11 kWh/t
(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 × 674 kW = 1348 kW)
- ball mill % solids = 83% weight
(to achieve 1424 kW, assume 30% vol mill charge, 17 RPM)
- Ebm at mill shell = 1348/210 = 6.41 kWh/t
- ball mill operating WiO relative to motor input = 13.0 kWh/t (= 13.7 kWh/t relative to mill shell)
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 | 6.5 | - | 6.9 | 13.4 | 196 |
| Survey | 6.1 | - | 6.4 | 12.5 | 210 |
| Difference | 0.4 | - | 0.5 | 0.9 | 14 |
| Difference | model 7% high | - | model 8% high | model 7% high | model 7% low |
