Difference between revisions of "Template:BarrattEtotalEquation"
(Created page with "<noinclude> Category:formula ==Barratt Total Circuit Specific Energy Equation== This is a basic equation of the family of Bond/Barratt calculations. It describes specific...") |
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This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy requirement of a grinding circuit consisting of primary SAG (or Autogenous) mills and secondary ball mills. |
This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy requirement of a grinding circuit consisting of primary SAG (or Autogenous) mills and secondary ball mills. |
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| + | ===Testwork Required=== |
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| + | * [[Testwork: Bond ball mill work index|Bond ball mill work index]] |
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| + | * [[Testwork: Bond rod mill work index|Bond rod mill work index]] |
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| + | * [[Testwork: Bond crushing work index|Bond crushing (low-energy impact) work index]] |
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| + | |||
| + | ===Discussion, Underlying Theory=== |
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The formula assumes that: |
The formula assumes that: |
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* The breakage properties of an ore is a function of measured hardness value; in this method the three Bond work index values. |
* The breakage properties of an ore is a function of measured hardness value; in this method the three Bond work index values. |
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* The grinding specific energy requirements of different grinding circuit configurations can be related by comparing their efficiency relative to the "maximum efficiency" circuit. |
* The grinding specific energy requirements of different grinding circuit configurations can be related by comparing their efficiency relative to the "maximum efficiency" circuit. |
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| − | The maximum efficiency circuit is described by the [[Template:EssbmEquation|Rowland E<sub>ssbm</sub> equation]] |
+ | The maximum efficiency circuit is described by the [[Template:EssbmEquation|Rowland E<sub>ssbm</sub> equation]] |
| + | ===Formula=== |
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<math>E_{total} = </noinclude> E_{ssbm} \times (1+CF) <noinclude></math> |
<math>E_{total} = </noinclude> E_{ssbm} \times (1+CF) <noinclude></math> |
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where: |
where: |
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* ''[[Template:EssbmEquation|E<sub>ssbm</sub>]]'' is the Rowland specific power consumption for a multi-stage crushing and single-stage ball mill circuit. |
* ''[[Template:EssbmEquation|E<sub>ssbm</sub>]]'' is the Rowland specific power consumption for a multi-stage crushing and single-stage ball mill circuit. |
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| − | * ''CF'' is a contingency factor that relates the grinding efficiency of the circuit being modelled versus the "maximum efficiency" circuit. |
+ | * ''CF'' is a contingency factor that relates the grinding efficiency of the circuit being modelled versus the "maximum efficiency" circuit. |
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| + | === Model defaults === |
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| + | In general, the CF value for a well-designed SABC circuit is 0.10 and the CF value for a well-designed SAB circuit is 0.15. |
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| + | ===Links=== |
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See list of pages that use this formula: {{Special:WhatLinksHere/Template:BarrattEtotalEquation}} |
See list of pages that use this formula: {{Special:WhatLinksHere/Template:BarrattEtotalEquation}} |
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</noinclude> |
</noinclude> |
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Latest revision as of 23:01, 2 December 2012
Contents
Barratt Total Circuit Specific Energy Equation
This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy requirement of a grinding circuit consisting of primary SAG (or Autogenous) mills and secondary ball mills.
Testwork Required
Discussion, Underlying Theory
The formula assumes that:
- The breakage properties of an ore is a function of measured hardness value; in this method the three Bond work index values.
- There exists a "maximum efficiency" grinding circuit configuration: the multi-stage crushing and single-stage ball mill circuit.
- The grinding specific energy requirements of different grinding circuit configurations can be related by comparing their efficiency relative to the "maximum efficiency" circuit.
The maximum efficiency circuit is described by the Rowland Essbm equation
Formula
where:
- Essbm is the Rowland specific power consumption for a multi-stage crushing and single-stage ball mill circuit.
- CF is a contingency factor that relates the grinding efficiency of the circuit being modelled versus the "maximum efficiency" circuit.
Model defaults
In general, the CF value for a well-designed SABC circuit is 0.10 and the CF value for a well-designed SAB circuit is 0.15.
Links
See list of pages that use this formula:
