Model:Amelunxen SGI - Revision history

Alex Doll: /* Optional parameters */

2023-08-30T14:59:14Z

Optional parameters

← Older revision		Revision as of 14:59, 30 August 2023
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	===Optional parameters===		===Optional parameters===
	* '''Description''' and '''Comment''' are optional text fields		* '''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		* '''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.		* [[Ball mill work index adjustment]] used to adjust Wi<sub>BM</sub> for different P<sub>80</sub> sizes.

Alex Doll: /* Transfer size */

2022-03-06T18:39:27Z

Transfer size

← Older revision		Revision as of 18:39, 6 March 2022
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	===Transfer size===		===Transfer size===
	The transfer size assumed in a Amelunxen SGI model is described as being "as would be measured in a plant survey" (uncorrected for the extra fines, the [[phantom cyclone]] effect). This is different to the basis of the various Bond models where the transfer size is a synthetic value that implies the removal of the extra fines.		The transfer size assumed in a Amelunxen SGI model is described as being "as would be measured in a plant survey" (uncorrected for the extra fines, meaning no allowance for the [[phantom cyclone]] effect is requried). This is different to the basis of the various Bond models where the transfer size is a synthetic value that implies the removal of the extra fines.

	In practical terms, running an SGI model will require relaxing the upper T80 constraints (the default constraints are tuned to the Bond models). Upper limits of 5000 µm or 6000 µm are not uncommon when simulating Andean copper porphyry type ores in SAB or SABC-A configurations.		In practical terms, running an SGI model will require relaxing the upper T80 constraints (the default constraints are tuned to the Bond models). Upper limits of 5000 µm or 6000 µm are not uncommon when simulating Andean copper porphyry type ores in SAB or SABC-A configurations.

Alex Doll at 18:37, 6 March 2022

2022-03-06T18:37:54Z

← Older revision		Revision as of 18:37, 6 March 2022
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	[[category:Specific Energy Models]]		[[category:Specific Energy Models]]
	[[category: Amelunxen SGI Model]]		[[category: Amelunxen SGI Model]]
			[[Category: P80 adjustment]]
	== Amelunxen SGI Model ==		== Amelunxen SGI Model ==
	This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by [[Bibliography:_Specific_energy_consumption_models\|Amelunxen (2014)]] for E<sub>SAG</sub> and the classical Bond work index equation for E<sub>ball</sub> substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.		This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by [[Bibliography:_Specific_energy_consumption_models\|Amelunxen (2014)]] for E<sub>SAG</sub> and the classical Bond work index equation for E<sub>ball</sub> substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.

Alex Doll: /* Optional parameters */

2020-03-22T17:49:46Z

Optional parameters

← Older revision		Revision as of 17:49, 22 March 2020
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	* '''T<sub>80</sub> min''' and '''T<sub>80</sub> min''' override the transfer size restrictions built into the model		* '''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.		* [[Ball mill work index adjustment]] used to adjust Wi<sub>BM</sub> for different P<sub>80</sub> sizes.
	** '''coefficient (a)''', the fitted coefficient to the adjustment equation		** '''coefficient (a)''', the fitted Hukki coefficient to the adjustment equation (enter as a positive number)
	** '''exponent (b)''', the fitted exponent to the adjustment equation
	* '''CFball calibration factor''', model tuning factor for E<sub>BM</sub>		* '''CFball calibration factor''', model tuning factor for E<sub>BM</sub>
	* '''CFsag calibration factor''', model tuning factor for E<sub>ASAG</sub>		* '''CFsag calibration factor''', model tuning factor for E<sub>ASAG</sub>


	===Formulae===		===Formulae===

Alex Doll: /* Amelunxen SGI Model */

2017-06-15T16:36:59Z

Amelunxen SGI Model

← Older revision		Revision as of 16:36, 15 June 2017
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	[[category: Amelunxen SGI Model]]		[[category: Amelunxen SGI Model]]
	== Amelunxen SGI Model ==		== Amelunxen SGI Model ==
	This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by Amelunxen (2014) for E<sub>SAG</sub> and the classical Bond work index equation for E<sub>ball</sub> substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.		This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by [[Bibliography:_Specific_energy_consumption_models\|Amelunxen (2014)]] for E<sub>SAG</sub> and the classical Bond work index equation for E<sub>ball</sub> substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.

	The model requires manual calibration factors for both equations (''CF<sub>SAG</sub>'' and ''CF<sub>ball</sub>'', respectively) and is very sensitive to the settings used for these factors.		The model requires manual calibration factors for both equations (''CF<sub>SAG</sub>'' and ''CF<sub>ball</sub>'', respectively) and is very sensitive to the settings used for these factors.

Alex Doll: /* Amelunxen SGI Model */

2017-06-15T16:35:50Z

Amelunxen SGI Model

← Older revision		Revision as of 16:35, 15 June 2017
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	[[category: Amelunxen SGI Model]]		[[category: Amelunxen SGI Model]]
	== Amelunxen SGI Model ==		== Amelunxen SGI Model ==
	This is a SAG or AG mill plus ball mill ~~model~~ ~~that estimates~~ the ~~specific~~ ~~energy~~ ~~consumption~~ (E<sub>SAG</sub>~~) using the equation by Amelunxen (2014)~~ and the classical Bond work index equation substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.		This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by Amelunxen (2014) for E<sub>SAG</sub> and the classical Bond work index equation for E<sub>ball</sub> substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.

	The model requires manual calibration factors for both equations (''CF<sub>SAG</sub>'' and ''CF<sub>ball</sub>'', respectively) and is very sensitive to the settings used for these factors.		The model requires manual calibration factors for both equations (''CF<sub>SAG</sub>'' and ''CF<sub>ball</sub>'', respectively) and is very sensitive to the settings used for these factors.

Alex Doll at 16:32, 15 June 2017

2017-06-15T16:32:33Z

← Older revision		Revision as of 16:32, 15 June 2017
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	[[category:Models]]		[[category:Models]]
	[[category:Specific Energy Models]]		[[category:Specific Energy Models]]
	[[~~Category~~:SGI Model]]		[[category: Amelunxen SGI Model]]
	== Amelunxen SGI Model ==		== Amelunxen SGI Model ==
	This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E<sub>SAG</sub>) using the equation by Amelunxen (2014) and the classical Bond work index equation substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.		This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E<sub>SAG</sub>) using the equation by Amelunxen (2014) and the classical Bond work index equation substituting ''CF<sub>ball</sub>'' in the place of the Rowland efficiency factors.

Alex Doll: /* CFball calibration factor */

2017-06-14T18:36:08Z

CFball calibration factor

← Older revision		Revision as of 18:36, 14 June 2017
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	(CFnet is the term used by Becerra & Amelunxen for CF<sub>ball</sub>)		(CFnet is the term used by Becerra & Amelunxen for CF<sub>ball</sub>)

	If the CF<sub>ball</sub> value is left blank, then the fitted "Los Bronces" curve is used (squares in the Becerra & Amelunxen diagram).		If the CF<sub>ball</sub> value is left blank, then the fitted "Los Bronces" curve is used (squares in the Becerra & Amelunxen diagram).

			CF<sub>ball</sub> = 2.35 - 0.29 × Ln(P<sub>80</sub>)

	===Transfer size===		===Transfer size===

Alex Doll: /* Formulae */

2017-05-01T16:41:33Z

Formulae

← Older revision		Revision as of 16:41, 1 May 2017
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	There is another model that has been published by F. Jorquera & M. Becerra (Procemin 2016) that was specifically calibrated to the El Soldado single-stage SAG mill (SS-SAG). They arrived at a 7% lower value for the coefficient (5.494 versus 5.9 in Amelunxen, 2014), 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. Of interest is this single-stage SAG mill uses SGI to predict grinding down to about 200 µm with no need for a ball mill work index.		There is another model that has been published by F. Jorquera & M. Becerra (Procemin 2016) that was specifically calibrated to the El Soldado single-stage SAG mill (SS-SAG). They arrived at a 7% lower value for the coefficient (5.494 versus 5.9 in Amelunxen, 2014), 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. Of interest is this single-stage SAG mill uses SGI to predict grinding down to about 200 µm with no need for a ball mill work index.

	<math>E_{~~SS-SAG~~} = 5.494 \times \left( \frac{SGI}{ \sqrt{T_{80}}} \right)^{0.5494} \times CFsag</math>		<math>E_\text{El Soldado} = 5.494 \times \left( \frac{SGI}{ \sqrt{T_{80}}} \right)^{0.5494} \times CFsag</math>

	The Single Stage SAG model in SAGMILLING.COM uses Amelunxen's form of the equations as it is not normal to reject pebbles the way it is done at El Soldado. The pebble rejection probably reduces the E<sub>SAG</sub> by about 10% at El Soldado versus what would be observed with pebble recycle.		The Single Stage SAG model in SAGMILLING.COM uses Amelunxen's form of the equations as it is not normal to reject pebbles the way it is done at El Soldado. The pebble rejection probably reduces the E<sub>SAG</sub> by about 10% at El Soldado versus what would be observed with pebble recycle.

Alex Doll: /* Formulae */

2017-05-01T16:40:19Z

Formulae

← Older revision		Revision as of 16:40, 1 May 2017
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	<math>E_{ball} = W_i \times \left ( \tfrac {10}{\sqrt{ P_{80} }} - \tfrac {10}{\sqrt{ T_{80} }} \right ) \times CF_{ball} </math><sup>[[Bibliography:_Specific_energy_consumption_models\|Becerra & Amelunxen, 2012]]</sup>		<math>E_{ball} = W_i \times \left ( \tfrac {10}{\sqrt{ P_{80} }} - \tfrac {10}{\sqrt{ T_{80} }} \right ) \times CF_{ball} </math><sup>[[Bibliography:_Specific_energy_consumption_models\|Becerra & Amelunxen, 2012]]</sup>

			There is another model that has been published by F. Jorquera & M. Becerra (Procemin 2016) that was specifically calibrated to the El Soldado single-stage SAG mill (SS-SAG). They arrived at a 7% lower value for the coefficient (5.494 versus 5.9 in Amelunxen, 2014), 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. Of interest is this single-stage SAG mill uses SGI to predict grinding down to about 200 µm with no need for a ball mill work index.

			<math>E_{SS-SAG} = 5.494 \times \left( \frac{SGI}{ \sqrt{T_{80}}} \right)^{0.5494} \times CFsag</math>

			The Single Stage SAG model in SAGMILLING.COM uses Amelunxen's form of the equations as it is not normal to reject pebbles the way it is done at El Soldado. The pebble rejection probably reduces the E<sub>SAG</sub> by about 10% at El Soldado versus what would be observed with pebble recycle.

	===CF<sub>sag</sub> calibration factor===		===CF<sub>sag</sub> calibration factor===