Difference between revisions of "Benchmarking: Bond - Kanowna Belle"
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Revision as of 19:50, 27 May 2014
Contents
Benchmarking: Bond/Barratt SABC Circuit Specific Energy Consumption - Kanowna Belle
Lunt, D.J., Thompson, A. and Ritchie, I. The Design and Operation of the Kanowna Belle Milling Circuit, SAG 1996, Pages 81-96.
Paper describes the design criteria for the circuit and one survey.
Design Criteria
The reported mill conditions during the survey are,
- throughput: 170 tonnes/hour
- SAG feed size, F80: 150 mm
- BM cyclone product size, P80: 71 µm
- SAG: 2134 kW power draw at mill shell (ESAG = 12.6 kWh/t)
- Ball mill: 1649 kW power draw at mill shell (ESAG = 9.70 kWh/t)
- transfer size: 300 µm
The pebble crusher isn't described, assume it is a 7-foot cone crusher with 300 HP motor drawing 168 kW (Epeb = 1.0 kWh/t). Total circuit specific energy consumption Etotal is 23.2 kWh/t.
Several samples are given in the text. It is assumed that the survey period looks similar to "Lowes West", the 'median' hardness sample of the non-oxidized samples. The Lowes West sample gives similar predictions to the "Pilot Plant" sample tested at A.R. MacPherson, which is claimed to have been selected to be representative of the sulphides.
Lowes West sample:
- WiC 26.7 (metric)
- WiRM 22.7 (metric)
- WiBM 16.1 (metric)
Density isn't given, assume 2.7 t/m3
Modelling, mill power draw
Adjust the SAG and ball mill models to get the shell power draws reported in the paper. Actual conditions don't matter because there isn't enough detail to properly model the mills -- treat them just as sources of output kW.
Modelling, Optimized Bond/Barratt SABC model
The Lowes West sample is predicted to have Essbm of 22.3 kWh/t, add 10% to give Etotal prediction of 24.6 kWh/t. Based on the split of SAG + BM power, the T80 needed to balance the circuit is about 1370 µm.
The predicted overall Etotal is within 5.6% of the survey value.
| Survey | Model | Difference | |
|---|---|---|---|
| ESAG | 12.55 kWh/t | 13.27 kWh/t | +5.7% |
| Eball | 9.70 kWh/t | 10.24 kWh/t | +5.6% |
| Epeb | 0.99 kWh/t | 1.04 kWh/t | +5.2% |
| Etotal | 23.24 kWh/t | 24.55 kWh/t | +5.6% |
Modelling, Raw Bond/Barratt SABC model
The Lowes West sample is predicted to have Etotal of 29.1 kWh/t. Based on the split of SAG + BM power, the T80 needed to balance the circuit is about 530 µm.
The predicted overall Etotal is 25.0% higher than the survey value.
| Survey | Model | Difference | |
|---|---|---|---|
| ESAG | 12.55 kWh/t | 15.70 kWh/t | +25.1% |
| Eball | 9.70 kWh/t | 12.12 kWh/t | +24.9% |
| Epeb | 0.99 kWh/t | 1.23 kWh/t | +24.5% |
| Etotal | 23.24 kWh/t | 29.05 kWh/t | +25.0% |
