Model:El Soldado SS SAG - Revision history

Alex Doll at 18:47, 6 March 2022

2022-03-06T18:47:17Z

Alex Doll: /* El Soldado SGI Single-Stage SAG Model */

2021-11-23T16:28:52Z

El Soldado SGI Single-Stage SAG Model

Alex Doll: /* Discussion - Use extreme caution with this model! */

2020-03-22T17:51:16Z

Discussion - Use extreme caution with this model!

Alex Doll: Created page with "category:Models category:Specific Energy Models category: Amelunxen SGI Model == El Soldado SGI Single-Stage SAG Model == This is a model that estimates the specif..."

2017-11-06T21:25:56Z

Created page with "category:Models category:Specific Energy Models category: Amelunxen SGI Model == El Soldado SGI Single-Stage SAG Model == This is a model that estimates the specif..."

New page

[[category:Models]]
[[category:Specific Energy Models]]
[[category: Amelunxen SGI Model]]
== El Soldado SGI Single-Stage SAG Model ==
This is a model that estimates the specific energy consumption of the single-stage SAG mill at El Soldado in Chile. The circuit operates in open circuit where pebbles are rejected to a different circuit. The model is based on the equation by [[Bibliography:_Specific_energy_consumption_models|Amelunxen (2014)]] for ESAG. This single-stage SAG mill uses SGI to predict grinding down to about 200 µm with no need for a ball mill work index.

===Testwork Required===
* [[Testwork: SAG grindability index|SAG grindability index]]

===Required parameters===
* '''F80, µm''' is the 80% passing size of the fresh feed to the circuit (expected to be a Bond-compatible size distribution).
* '''P80, µm''' is the 80% passing size of the circuit product (expected to be a Bond-compatible size distribution).
* '''Availability''', expressed as a decimal (0.90 = 90% availability) is used to convert t/h to t/d.

===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).
* '''CFsag calibration factor''', model tuning factor for EASAG

===Formulae===

This model, published by F. Jorquera & M. Becerra (Procemin 2016), is specifically calibrated to the El Soldado single-stage SAG mill (SS-SAG). The El Soldado SAG mill operates in open circuit where pebbles are rejected to a different grinding line (of crushers with single-stage ball milling). The calibration parameters are different than Amelunxen, 2014: a 7% lower value for the coefficient (5.494 versus 5.9 in Amelunxen), and a slightly different exponent (0.563 versus 0.55 in Amelunxen). The exponent is within 2% of Amelunxen's value, and the model does not account for the way El Soldado rejects uncrushed pebbles from the SAG circuit, so the SGI of the feed is slightly harder than the actual work the mill is doing.

<math>E_{SAG} = 5.494 \times \left( \frac{SGI}{ \sqrt{P_{80}}} \right)^{0.5494} \times CFsag</math>[[Bibliography:_Specific_energy_consumption_models|Jorquera & Becerra, 2016]]

<math>E_{peb} = \frac{\text{Crusher kW} \times \text{Efficiency} }{t/h}</math>

<math>E_{total} = E_{SAG}+E_{peb}</math>

===CFsag calibration factor===
The ''CFsag'' factor is used to reflect the effect of '''pebble crushing''' and '''pre-crushing''' on the overall circuit performance.

* Base value, SAB circuit (no pebble crushing, ~6 inch SAG feed), CFsag = 1.00
* Pebble crushing, SABC circuit, CFsag = 0.85
* Pre-crushing, (fine SAG feed, -120 mm SAG feedCuster et al, CMP 2001), CFsag = 0.90
* Pre-crushing and pebble crushing, CFsag = 0.85 × 0.90 = 0.77

==Discussion - Use extreme caution with this model!==
The technical paper by Doll & Becerra (Procemin, 2017) compared the predictions of several single-stage SAG mill models, including the El Soldado model, to published information from five mines. The El Soldado model generally worked well at El Soldado, but gave poor predictions for nearly all the other mines in the paper. '''Use this model with extreme caution'''; the [[Model:Bond/Barratt SS SAG|Bond/Barratt]] and [[Model:Morrell SS SAG|Morrell]] models are much better at making predictions on a variety of ores.

@@ Line 38: / Line 38: @@
 * Pre-crushing and pebble crushing, CF<sub>sag</sub> = 0.85 &times; 0.90 = 0.77
-==Discussion - Use extreme caution with this model!==
+==Discussion - Use extreme caution!==
 The technical paper by Doll & Becerra (Procemin, 2017) compared the predictions of several single-stage SAG mill models, including the El Soldado model, to published information from five mines.  The El Soldado model generally worked well at El Soldado, but gave poor predictions for nearly all the other mines in the paper.  '''Use this model with extreme caution'''; the [[Model:Bond/Barratt SS SAG|Bond/Barratt]] and [[Model:Morrell SS SAG|Morrell]] models are much better at making predictions on a variety of ores.

@@ Line 2: / Line 2: @@
 [[category:Specific Energy Models]]
 [[category: Amelunxen SGI Model]]
 == El Soldado SGI Single-Stage SAG Model ==
 '''Use with extreme caution, see discussion at the bottom of the page.'''