Benchmarking: Fimiston Ball Mills - Revision history

Alex Doll: /* Benchmarking: Ball Mill Power Draw - Fimiston */

2014-01-26T17:59:41Z

Benchmarking: Ball Mill Power Draw - Fimiston

← Older revision		Revision as of 17:59, 26 January 2014
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	! Pulp %solids,<br>w/w		! Pulp %solids,<br>w/w
	! Morrell SAG Model,<br>kW at input / ''shell''		! Morrell SAG Model,<br>kW at input / ''shell''
	! Nordberg Model,<br>kW at input / ''shell''		! Nordberg Model,<br>no density correction<br>kW at input / ''shell''
			! Nordberg Model,<br>density correction<br>kW at input / ''shell''
	\|-		\|-
	\| Survey 1		\| Survey 1
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	\| 38.7		\| 38.7
	\| 72.0		\| 72.0
	\| '''3,~~933~~''' / ''3,~~776~~''		\| '''3,798''' / ''3,798''
	\| '''3,619''' / ''3,370''		\| '''3,619''' / ''3,370''
			\| '''3,894''' / ''3,626''
	\|}		\|}
	<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.4% critical speed.		<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.4% critical speed.

Alex Doll: /* Benchmarking: Ball Mill Power Draw - Fimiston */

2013-11-24T03:19:07Z

Benchmarking: Ball Mill Power Draw - Fimiston

← Older revision		Revision as of 03:19, 24 November 2013
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	\| '''3,619''' / ''3,370''		\| '''3,619''' / ''3,370''
	\|}		\|}
	<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.3% critical speed.		<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.4% critical speed.

	The ball mill belly length can be achieved with a 18 degree head angle and 1.9 m trunnion diameter.		The ball mill belly length can be achieved with a 18 degree head angle and 1.9 m trunnion diameter.

Alex Doll: /* Benchmarking: Ball Mill Power Draw - Fimiston */

2013-11-24T03:18:23Z

Benchmarking: Ball Mill Power Draw - Fimiston

← Older revision		Revision as of 03:18, 24 November 2013
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	* ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit''', Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.		* ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit''', Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.
	** Diameter inside shell = 5.49 m (18 ft)		** Diameter inside shell = 5.49 m (18 ft)
	** Diameter inside liners = 5.35 m (17.5 ft, ~~3.0~~ ~~inch~~ effective liner thickness)		** Diameter inside liners = 5.35 m (17.5 ft, 70 mm effective liner thickness)
	** Belly length inside liners (EGL) = 7.60 m (25 ft)		** Belly length inside liners (EGL) = 7.60 m (25 ft)
	** Centre-line length = 8.76 m		** Centre-line length = 8.76 m
	** Top ball size = 80 mm		** Top ball size = 80 mm
			** Ore density 2.93 t/m<sup>3</sup>
	Table 5 presents results of a single ball mill survey. The survey measured motor input power. Drives are assumed to have an efficiency of 0.96 and gearbox+pinion efficiency of 0.970, so the model shell power draw is converted to motor input power by dividing by 0.9312. The predicted power draw of '''Example''' project circuit number 7 (Fimiston) using sample '''MLE''', based on the KCGM paper published by Campbell, J. et al; 1998 AusIMM Annual Conference.		Table 5 presents results of a single ball mill survey. The survey measured motor input power. Drives are assumed to have an efficiency of 0.96 and gearbox+pinion efficiency of 0.970, so the model shell power draw is converted to motor input power by dividing by 0.9312. The predicted power draw of '''Example''' project circuit number 7 (Fimiston) using sample '''MLE''', based on the KCGM paper published by Campbell, J. et al; 1998 AusIMM Annual Conference.

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	\| Survey 1		\| Survey 1
	\| '''3,864'''		\| '''3,864'''
	\| <del>66.7</del> 68.3 <sup>&dagger;</sup>		\| <del>66.7</del> 68.4 <sup>&dagger;</sup>
	\| 38.7		\| 38.7
	\| 72.0		\| 72.0
	\| '''3,933''' / ''3,776''		\| '''3,933''' / ''3,776''
	\| '''3,~~592~~''' / ''3,~~345~~''		\| '''3,619''' / ''3,370''
	\|}		\|}
	<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.3% critical speed.		<sup>&dagger;</sup> The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.3% critical speed.

Alex Doll at 18:53, 1 January 2013

2013-01-01T18:53:56Z

← Older revision		Revision as of 18:53, 1 January 2013
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	[[category:Benchmarking]]		[[category:Benchmarking]]
			[[category:Bibliography]]
	==Benchmarking: Ball Mill Power Draw - Fimiston==		==Benchmarking: Ball Mill Power Draw - Fimiston==
	* ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit''', Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.		* ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit''', Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.

Alex Doll: Created page with "category:Benchmarking ==Benchmarking: Ball Mill Power Draw - Fimiston== * ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimi..."

2012-12-07T18:05:25Z

Created page with "category:Benchmarking ==Benchmarking: Ball Mill Power Draw - Fimiston== * ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimi..."

New page

[[category:Benchmarking]]
==Benchmarking: Ball Mill Power Draw - Fimiston==
* ''Nelson, M; Valery, W; Morrell, S'', '''Performance Characteristics and Optimisation of the Fimiston (KCGM) SAG Mill Circuit''', Page 233 - 248, SAG 1996 Conference, Vancouver, Canada.
** Diameter inside shell = 5.49 m (18 ft)
** Diameter inside liners = 5.35 m (17.5 ft, 3.0 inch effective liner thickness)
** Belly length inside liners (EGL) = 7.60 m (25 ft)
** Centre-line length = 8.76 m
** Top ball size = 80 mm
Table 5 presents results of a single ball mill survey. The survey measured motor input power. Drives are assumed to have an efficiency of 0.96 and gearbox+pinion efficiency of 0.970, so the model shell power draw is converted to motor input power by dividing by 0.9312. The predicted power draw of '''Example''' project circuit number 7 (Fimiston) using sample '''MLE''', based on the KCGM paper published by Campbell, J. et al; 1998 AusIMM Annual Conference.

{| class="wikitable" border="1"
|-
! Survey
! Survey Power, kW at input
! Mill speed, %critical
! Total load, %v/v
! Pulp %solids, w/w
! Morrell SAG Model, kW at input / ''shell''
! Nordberg Model, kW at input / ''shell''
|-
| Survey 1
| '''3,864'''
| <del>66.7</del> 68.3 &dagger;
| 38.7
| 72.0
| '''3,933''' / ''3,776''
| '''3,592''' / ''3,345''
|}
&dagger; The appendix of the paper lists the mill speed as 12.5 RPM. The mill is fixed speed, so the %critical speed is only a function of mill effective diameter (as liners wear). Doing the math (neglecting the balls) gives a 68.3% critical speed.

The ball mill belly length can be achieved with a 18 degree head angle and 1.9 m trunnion diameter.