Template:BarrattEsagEquation - Revision history

Alex Doll: /* Barratt SAG Specific Energy Equation */

2012-11-06T19:35:13Z

Barratt SAG Specific Energy Equation

Alex Doll: /* Barratt SAG Specific Energy Equation */

2012-11-06T19:33:05Z

Barratt SAG Specific Energy Equation

Alex Doll: /* Barratt SAG Specific Energy Equation */

2012-11-06T19:31:28Z

Barratt SAG Specific Energy Equation

Alex Doll: Created page with " Category:formula ==Barratt SAG Specific Energy Equation== This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy re..."

2012-11-06T19:30:51Z

Created page with "<noinclude> Category:formula ==Barratt SAG Specific Energy Equation== This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy re..."

New page

<noinclude>
[[Category:formula]]
==Barratt SAG Specific Energy Equation==
This is a basic equation of the family of Bond/Barratt calculations. It describes specific energy requirement of a SAG (or Autogenous) mill ''Esag'' as a function of feed size ''F80'', transfer size ''T80'' and the work index values at three different sizes:
* ''WiC'': the Bond low-energy impact crushing work index, covers 20 mm to 100 mm size range.
* ''WiRM'': the Bond rod mill work index, covers 2 mm to 10 mm size range.
* ''WiBM'': the Bond ball mill work index, less than 2 mm size range.
There are a series of calibration parameters that correspond to the size ranges listed above. It is useful to think of this model as a hypothetical 3-stage crushing — rod mill — ball mill circuit with a calibration adjustment (1.25) for SAG milling.
* ''PC'' is the hypothetical tertiary crusher product size (default=18850 µm)
* ''PR'' is the hypothetical rod mill product size (default=2100 µm)
Three Rowland Efficiency Factor adjustments are required:
* ''EF4RM'' is the oversize feed factor for rod milling, and is a function of the hypothetical crusher product size or the larger of work index for crushing and work index for rod milling.
* ''EF4BM'' is the oversize feed factor for ball milling, and is a function of the hypothetical rod mill product size and the work index for rod milling.

<math></noinclude>{{{E|E_{SAG}}}} = \left [
{{{WiC|Wi_{C} }}} \times \left ( \frac {10}{\sqrt{ {{{Pc|P_{C} }}} }} - \frac {10}{\sqrt{ {{{F80|F_{80} }}} }} \right ) +
{{{WiRM|Wi_{RM}}}} \times \left ( \frac {10}{\sqrt{ {{{Pr|P_{R} }}} }} - \frac {10}{\sqrt{ {{{Pc|P_{C} }}} }} \right ) \times EF_4^{RM} +
{{{WiBM|Wi_{BM}}}} \times \left ( \frac {10}{\sqrt{110} } - \frac {10}{\sqrt{ {{{Pr|P_{R} }}} }} \right ) \times EF_4^{BM}
\right ] </math><math>\times 1.25
- {{{WiBM|Wi_{BM}}}} \times \left ( \frac {10}{\sqrt{ {110} }} - \frac {10}{\sqrt{ {{{T80|T_{80} }}} }} \right ) <noinclude></math>

See list of pages that use this formula: {{Special:WhatLinksHere/Template:BarattEsagEquation}}
</noinclude>

@@ Line 14: / Line 14: @@
-<math></noinclude>{{{E|E_{SAG}}}} = \left [
+<math></noinclude>{{{E|E_{SAG}}}} = \left [ \left (
  {{{WiC|Wi_{C}  }}} \times \left ( \frac {10}{\sqrt{ {{{Pc|P_{C} }}} }} - \frac {10}{\sqrt{ {{{F80|F_{80} }}} }} \right ) +
  {{{WiRM|Wi_{RM}}}} \times \left ( \frac {10}{\sqrt{ {{{Pr|P_{R} }}} }} - \frac {10}{\sqrt{ {{{Pc|P_{C} }}} }} \right ) \times EF_4^{RM} +
  {{{WiBM|Wi_{BM}}}} \times \left ( \frac {10}{\sqrt{110} } - \frac {10}{\sqrt{ {{{Pr|P_{R} }}} }} \right ) \times EF_4^{BM}
-\right ]\times 1.25
+\right )\times 1.25
-- {{{WiBM|Wi_{BM}}}} \times \left ( \frac {10}{\sqrt{ {110} }} - \frac {10}{\sqrt{ {{{T80|T_{80} }}} }} \right ) <noinclude></math>
+- {{{WiBM|Wi_{BM}}}} \times \left ( \frac {10}{\sqrt{ {110} }} - \frac {10}{\sqrt{ {{{T80|T_{80} }}} }} \right ) \right ] <noinclude></math>
 See list of pages that use this formula: {{Special:WhatLinksHere/Template:BarrattEsagEquation}}