Difference between revisions of "Benchmarking: Bond - Cadia"

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[[category:benchmarking]]
  
[[category:benchmarking]]
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[[category:Bond/Barratt model]]
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[[category:Bond/Barratt Model]]
 
==Benchmarking: Bond/Barratt - Cadia==
  
==Benchmarking: Bond/Barratt - Cadia==
 
''Dunne, R., Morrell, S., Lane, G., Valery, W. and Hart, S.'', '''Design of the 40 foot diameter SAG mill installed at the Cadia gold copper mine'''. Proceedings of SAG 2001, pages I-43 to I-58.
  
''Dunne, R., Morrell, S., Lane, G., Valery, W. and Hart, S.'', '''Design of the 40 foot diameter SAG mill installed at the Cadia gold copper mine'''. Proceedings of SAG 2001, pages I-43 to I-58.
  +
 
''Lane, G., Foggiatto, B. and Bueno, M'', '''Power-based comminution calculations using Ausgrind'''. Proceedings of Procemin 2013, Chapter 2, paper 2.
  
''Lane, G., Foggiatto, B. and Bueno, M'', '''Power-based comminution calculations using Ausgrind'''. Proceedings of Procemin 2013, Chapter 2, paper 2.
   
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* Survey conducted shortly after start-up
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Papers describe a survey conducted shortly after start-up.
   
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Ore characterization:
 +
===Ore characterization===
 
* Monzonite ore type,
  
* Monzonite ore type,
 
** Wi<sub>C</sub> = 16.5 (metric)
 
** Wi<sub>C</sub> = 16.5 (metric)
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** DWI = 7.5
  
** DWI = 7.5
 
** density = 2.7 t/m³
  
** density = 2.7 t/m³
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* SAG feed is primary crushed to F<sub>80</sub> = 98 mm
  
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* Ball mill circuit product P<sub>80</sub> = 170 &micro;m
  
   
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SAG mill characteristics:
 +
===SAG mill characteristics===
 
* Diameter inside shell = 12.2 m (40 ft)
  
* Diameter inside shell = 12.2 m (40 ft)
 
* EGL = 6.1 m (20 ft)
  
* EGL = 6.1 m (20 ft)
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* Mill speed = 78% of critical <small>(Lane et al, 2013 appears to have a typo. They claim 72% which actually looks like the BM speed)</small>
  
* Mill speed = 78% of critical <small>(Lane et al, 2013 appears to have a typo. They claim 72% which actually looks like the BM speed)</small>
 
* Pulp density = 70% w/w
  
* Pulp density = 70% w/w
  +
* SAG feed is primary crushed to F<sub>80</sub> = 98 mm
   
−
Ball mill characteristics:
 +
===Ball mill characteristics===
 
* Diameter inside shell = 6.7 m (22 ft)
  
* Diameter inside shell = 6.7 m (22 ft)
 
* EGL = 11.3 m (36.5 ft)
  
* EGL = 11.3 m (36.5 ft)
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* Mill speed = 72% of critical
  
* Mill speed = 72% of critical
 
* Pulp density = 70% w/w
  
* Pulp density = 70% w/w
  +
* Ball mill circuit product P<sub>80</sub> = 170 &micro;m
   
  +
===Modelling===
−
Result for default model conditions:
  
  +
<gallery>
  +
File:Procemin-CadiaBenchmarking.png|Model screenshot of Cadia 1998 survey simulation
  +
File:Procemin2013-CadiaSag.png|SAG model screenshot of Cadia 1998 survey simulation
  +
File:Procemin2013-CadiaBM.png|Ball mill model screenshot of Cadia 1998 survey simulation
  +
</gallery>
  +
  +
===Results===
  +
  +
Result for default Optimized Bond/Barratt SABC-A model conditions:
 
{| class="wikitable" border="1"
  
{| class="wikitable" border="1"
 
|-
  
|-
 
!
  
!
  +
!T80, mm
 
!Esag
  
!Esag
 
!Epeb
  
!Epeb
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!Etotal
  
!Etotal
 
!t/h
  
!t/h
−
!T80, mm
  
 
|-
  
|-
 
| Predicted
  
| Predicted
  +
| 2.06
 
| 8.6
  
| 8.6
 
| 0.3
  
| 0.3
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| 17.4
  
| 17.4
 
| 2000
  
| 2000
−
| 2.06
  
 
|-
  
|-
 
| Survey
  
| Survey
  +
| 1.34
 
| 8.6
  
| 8.6
 
| -
  
| -
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| 16.6
  
| 16.6
 
| 2065
  
| 2065
−
| 1.34
  
 
|-
  
|-
 
| Difference
  
| Difference
  +
| 0.72
 
| 0
  
| 0
 
| 0.3
  
| 0.3
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| 0.8
  
| 0.8
 
| -65
  
| -65
−
| 0.72
  
 
|-
  
|-
 
| Difference
  
| Difference
  +
| 54%
 
| 0%
  
| 0%
 
| -
  
| -
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| 5%
  
| 5%
 
| -3%
  
| -3%
−
| 54%
  
 
|}
  
|}
  +
  +
  +
===Discussion===
  +
* The rod mill work index was determined on an apparatus with a smooth liner. Bond specified that the liners of a Bond rod mill work index apparatus should have wave liners, and the Optimized Bond/Barratt model is calibrated to the wave-liner machines. If one deducts 2 kWh/t from the rod mill work index (allowance for difference in apparatus) and re-runs the calculation, the following results are obtained:
  +
** E<sub>SAG</sub> = 8.3 kWh/t (-3% from survey)
  +
** E<sub>ball</sub> = 8.2 kWh/t (+2% from survey)
  +
** E<sub>total</sub> = 16.8 kWh/t (+1% from survey)
  +
* Using the Raw Bond/Barratt model predicts E<sub>total</sub> = 18.2 kWh/t (+10% from survey). The Optimized Bond/Barratt model works better at modelling this circuit.

Latest revision as of 22:49, 31 January 2015

Benchmarking: Bond/Barratt - Cadia

Dunne, R., Morrell, S., Lane, G., Valery, W. and Hart, S., Design of the 40 foot diameter SAG mill installed at the Cadia gold copper mine. Proceedings of SAG 2001, pages I-43 to I-58.

Lane, G., Foggiatto, B. and Bueno, M, Power-based comminution calculations using Ausgrind. Proceedings of Procemin 2013, Chapter 2, paper 2.

Papers describe a survey conducted shortly after start-up.

Ore characterization

  • Monzonite ore type,
    • WiC = 16.5 (metric)
    • WiRM = 19.0 (metric)
    • WiBM = 17.1 (metric)
    • A×b = 36
    • DWI = 7.5
    • density = 2.7 t/m³

SAG mill characteristics

  • Diameter inside shell = 12.2 m (40 ft)
  • EGL = 6.1 m (20 ft)
  • Ball filling = 12% v/v
  • Total filling = 25% v/v
  • Mill speed = 78% of critical (Lane et al, 2013 appears to have a typo. They claim 72% which actually looks like the BM speed)
  • Pulp density = 70% w/w
  • SAG feed is primary crushed to F80 = 98 mm

Ball mill characteristics

  • Diameter inside shell = 6.7 m (22 ft)
  • EGL = 11.3 m (36.5 ft)
  • Ball filling = 30% v/v
  • Mill speed = 72% of critical
  • Pulp density = 70% w/w
  • Ball mill circuit product P80 = 170 µm

Modelling

  • Model screenshot of Cadia 1998 survey simulation

  • SAG model screenshot of Cadia 1998 survey simulation

  • Ball mill model screenshot of Cadia 1998 survey simulation

Results

Result for default Optimized Bond/Barratt SABC-A model conditions:

T80, mm Esag Epeb Ebm Etotal t/h
Predicted 2.06 8.6 0.3 8.5 17.4 2000
Survey 1.34 8.6 - 8 16.6 2065
Difference 0.72 0 0.3 0.5 0.8 -65
Difference 54% 0% - 6% 5% -3%


Discussion

  • The rod mill work index was determined on an apparatus with a smooth liner. Bond specified that the liners of a Bond rod mill work index apparatus should have wave liners, and the Optimized Bond/Barratt model is calibrated to the wave-liner machines. If one deducts 2 kWh/t from the rod mill work index (allowance for difference in apparatus) and re-runs the calculation, the following results are obtained:
    • ESAG = 8.3 kWh/t (-3% from survey)
    • Eball = 8.2 kWh/t (+2% from survey)
    • Etotal = 16.8 kWh/t (+1% from survey)
  • Using the Raw Bond/Barratt model predicts Etotal = 18.2 kWh/t (+10% from survey). The Optimized Bond/Barratt model works better at modelling this circuit.
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