Model:Bond/Barratt SABC Models - Revision history

Alex Doll: /* Model defaults */

2025-07-18T14:48:52Z

Model defaults

2024-09-23T14:05:25Z

Optional parameters

2024-09-23T14:02:07Z

Formulae

2023-08-30T14:57:24Z

Optional parameters

2023-08-03T15:30:45Z

2022-04-19T22:39:15Z

Optional parameters

2022-03-06T18:37:06Z

2021-09-20T17:35:51Z

Discussion, pebble crushing

2021-09-20T17:35:06Z

Optional parameters

2021-09-20T17:34:46Z

Formulae

@@ Line 97: / Line 97: @@
 * P<sub>C</sub> for Easag= 18850
 * P<sub>R</sub>= 2100
-* CF = 0.10
+* CF = 1.10

@@ Line 28: / Line 28: @@
 ** '''exponent (a)''', the fitted Hukki exponent to the adjustment equation (enter as a positive number)
 * '''Essbm calibration factor''' (CF), model tuning factor for E<sub>total</sub>
 ===Formulae===

@@ Line 31: / Line 31: @@
 ===Formulae===
 <math>
-E_{ssbm} = Wi_{C} \times \left ( \tfrac {10}{\sqrt{ 9400 }} - \tfrac {10}{\sqrt{ F_{80} }} \right ) + Wi_{RM} \times \left ( \tfrac {10}{\sqrt{ 2100 }} - \tfrac {10}{\sqrt{ 9400 }} \right )\times EF_4^{RM} + Wi_{BM} \times \left ( \tfrac {10}{\sqrt{ P_{80} }} - \tfrac {10}{\sqrt{ 2100 }} \right ) \times EF_4^{BM} \times EF_5</math>
+E_{ssbm} = Wi_{C} \times \left ( \tfrac {10}{\sqrt{ Pc_{ssbm} }} - \tfrac {10}{\sqrt{ F_{80} }} \right ) + Wi_{RM} \times \left ( \tfrac {10}{\sqrt{ Prm }} - \tfrac {10}{\sqrt{ Pc_{ssbm} }} \right )\times EF_4^{RM} + Wi_{BM} \times \left ( \tfrac {10}{\sqrt{ P_{80} }} - \tfrac {10}{\sqrt{ Prm }} \right ) \times EF_4^{BM} \times EF_5</math>
 <sup>[[Bibliography:_Specific_energy_consumption_models|Rowland, 2006]]</sup>
 <math> E_{total}  = E_{ssbm} \times (CF) </math>
@@ Line 43: / Line 47: @@
 </math>
 <sup>[[Bibliography:_Specific_energy_consumption_models|Barratt, 1989]]</sup>
 <math> E_{bm}= E_{total} - E_{sag}</math>

@@ Line 23: / Line 23: @@
 ===Optional parameters===
 * '''Description''' and '''Comment''' are optional text fields
-* '''Maximum t/h limit''' is a t/h throughput above which a warning message is displayed (but does not actually limit the throughput).
+* '''Maximum t/h limit''' is a t/h throughput limit above which the mills will turn down by, for example, grinding out.
 * '''T<sub>80</sub> min''' and '''T<sub>80</sub> min''' override the transfer size restrictions built into the model
 * [[Ball mill work index adjustment]] used to adjust Wi<sub>BM</sub> for different P<sub>80</sub> sizes.

@@ Line 3: / Line 3: @@
 [[Category: Bond/Barratt Model]]
 [[Category: P80 adjustment]]
 == Bond/Barratt Specific Energy Consumption SABC Model ==

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 The pebble crusher is assumed to be part of the SAG mill for the purposes of this calculation.  E<sub>peb</sub> is calculated as the power drawn by the pebble crusher divided by the circuit throughput.  This E<sub>peb</sub> is then deducted from E<sub>sag</sub>.
-The total circuit specific energy consumption is generally higher when no pebble crusher is present in a circuit.  The rule of thumb is apply the CF value of 0.15 for SAB circuits (5% higher overall specific energy consumption) <sup>[[Bibliography:_Specific_energy_consumption_models#SPI.2FMinnovex_Method|Bennett, Dobby & Kosick, SAG 2001]]</sup>. Published data from Cadia confirms a 5% difference in throughput (and therefore, specific energy) when the pebble crusher is fully utilized.<sup>Hart, Valery, Clements, Reed, Song & Dunne, SAG 2001</sup>.
+The total circuit specific energy consumption is generally higher when no pebble crusher is present in a circuit.  The rule of thumb is apply the CF value of 1.15 for SAB circuits (5% higher overall specific energy consumption) <sup>[[Bibliography:_Specific_energy_consumption_models#SPI.2FMinnovex_Method|Bennett, Dobby & Kosick, SAG 2001]]</sup>. Published data from Cadia confirms a 5% difference in throughput (and therefore, specific energy) when the pebble crusher is fully utilized.<sup>Hart, Valery, Clements, Reed, Song & Dunne, SAG 2001</sup>.
 === Discussion, Rowland EF factors ===

@@ Line 32: / Line 32: @@
 <sup>[[Bibliography:_Specific_energy_consumption_models|Rowland, 2006]]</sup>
-<math> E_{total}  = E_{ssbm} \times (1+CF) </math>
+<math> E_{total}  = E_{ssbm} \times (CF) </math>
@@ Line 63: / Line 63: @@
 The model assumes that the calculated value of E<sub>ssbm</sub> + the specified contingency is greater than the sum of E<sub>sag</sub> + E<sub>peb</sub>; otherwise E<sub>bm</sub> will be negative.  The model does a check to see if E<sub>bm</sub> calculated is negative (or close to zero) and, if so, will substitute the [[Model:RawBondModel|Raw Bond Model]] equation estimate for E<sub>bm</sub>.
 == Recommended Usage ==