Testwork: Bond rod mill work index - Revision history

Alex Doll: /* Laboratory Apparatus */

2026-02-06T11:54:45Z

Laboratory Apparatus

← Older revision		Revision as of 11:54, 6 February 2026
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	A Non-standard rod mill result can be converted to a Bond rod mill work index by:		A Non-standard rod mill result can be converted to a Bond rod mill work index by:

	Bond Wi<sub>RM</sub> = 0.565 × (Wi<sub>nonstandard</sub>)^1.12		Bond Wi<sub>RM</sub> = 0.565 × (Wi<sub>nonstandard</sub>)<sup>1.12</sup>

	Source: Dec 2025 Public Grindability Database		Source: Dec 2025 Public Grindability Database

Alex Doll: /* Laboratory Apparatus */

2026-02-06T11:53:52Z

Laboratory Apparatus

← Older revision		Revision as of 11:53, 6 February 2026
Line 40:		Line 40:
	A Non-standard rod mill result can be converted to a Bond rod mill work index by:		A Non-standard rod mill result can be converted to a Bond rod mill work index by:

	Bond Wi<sub>RM</sub> = 0.42 × (Wi<sub>nonstandard</sub>)^1.22		Bond Wi<sub>RM</sub> = 0.565 × (Wi<sub>nonstandard</sub>)^1.12

	Source: Dec ~~2023~~ Public Grindability Database		Source: Dec 2025 Public Grindability Database

	[[File:ExampleDB-WiRMvAxb-comparison.png\|600px\|Published A×b and Wi<sub>RM</sub> results]]		[[File:ExampleDB-WiRMvAxb-comparison.png\|600px\|Published A×b and Wi<sub>RM</sub> results]]

Alex Doll: /* Laboratory Apparatus */

2026-02-06T11:34:33Z

Laboratory Apparatus

← Older revision		Revision as of 11:34, 6 February 2026
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	Source: Dec 2023 Public Grindability Database		Source: Dec 2023 Public Grindability Database

	[[File:ExampleDB-WiRMvAxb-comparison.png]]		[[File:ExampleDB-WiRMvAxb-comparison.png\|600px\|Published A×b and Wi<sub>RM</sub> results]]


	=== Modelling ===		=== Modelling ===

Alex Doll at 11:51, 8 October 2025

2025-10-08T11:51:26Z

← Older revision		Revision as of 11:51, 8 October 2025
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	==Testwork: Bond Rod Mill Work Index==		==Testwork: Bond Rod Mill Work Index==
	{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}		{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}
⚫	~~The Bond rod mill work index is not as common as the [[Testwork~~: ~~Bond ball mill work index\|Bond ball mill work index]], and there~~ are two different variations on the mill apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these results can safely be used in the models. Bond rod mill work index results from Australian laboratories with smooth liners should not be used in the SAGMILLING.COM models.

	The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test must achieve a steady-state before completion.		The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test must achieve a steady-state before completion. The Bond rod mill work index is not as common as the [[Testwork: Bond ball mill work index\|Bond ball mill work index]], but the laboratory procedures are quite similar.

		⚫	Warning: There are two different variations on the mill apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these results can safely be used in the models. Bond rod mill work index results from Australian laboratories with smooth liners should not be used in the SAGMILLING.COM models without corrections, see the ''apparatus'' section, below.

	===Sample Requirements===		===Sample Requirements===

Alex Doll at 11:45, 8 October 2025

2025-10-08T11:45:41Z

← Older revision		Revision as of 11:45, 8 October 2025
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	<math> Wi_{RM} = \frac{1.1023 \times 62}{P_{100}^{0.23} \times gpr^{0.625} \times (\frac{10}{\sqrt{P_{80}}} - \frac{10}{\sqrt{F_{80}}})}</math>		<math> Wi_{RM} = \frac{1.1023 \times 62}{P_{100}^{0.23} \times gpr^{0.625} \times (\frac{10}{\sqrt{P_{80}}} - \frac{10}{\sqrt{F_{80}}})}</math>

			=== Laboratory Apparatus ===
			Rod mill work index results are only valid if the laboratory apparatus has the following features:
			* a wave liner
			* the mill is rocked 5° backward and forward every 10 revolutions

			Several laboratories (mostly in Australia) do not have the proper apparatus and their "rod mill work index" results will be incompatible with a "Bond rod mill work index".

			A Non-standard rod mill result can be converted to a Bond rod mill work index by:

			Bond Wi<sub>RM</sub> = 0.42 × (Wi<sub>nonstandard</sub>)^1.22

			Source: Dec 2023 Public Grindability Database

			[[File:ExampleDB-WiRMvAxb-comparison.png]]


	=== Modelling ===		=== Modelling ===

Alex Doll: /* Test Outputs */

2022-11-11T14:58:19Z

Test Outputs

← Older revision		Revision as of 14:58, 11 November 2022
Line 26:		Line 26:
	Extra field available for modelling		Extra field available for modelling
	* <b>synthetic</b> indicates whether this is a real test result, or just a synthetic one that should only be used for modelling. If this column contains a value of '1' (boolean=true) for a test, then that test is understood to <u>not</u> be a real test result and is therefore not shown on the testwork comparison charts. Synthetic values are available when running circuit model simulations and do show up in the list of model results.		* <b>synthetic</b> indicates whether this is a real test result, or just a synthetic one that should only be used for modelling. If this column contains a value of '1' (boolean=true) for a test, then that test is understood to <u>not</u> be a real test result and is therefore not shown on the testwork comparison charts. Synthetic values are available when running circuit model simulations and do show up in the list of model results.


			<math> Wi_{RM} = \frac{1.1023 \times 62}{P_{100}^{0.23} \times gpr^{0.625} \times (\frac{10}{\sqrt{P_{80}}} - \frac{10}{\sqrt{F_{80}}})}</math>

	=== Modelling ===		=== Modelling ===

Alex Doll: /* Test Outputs */

2015-07-24T19:28:02Z

Test Outputs

← Older revision		Revision as of 19:28, 24 July 2015
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	The laboratory will report the following information:		The laboratory will report the following information:
			* <b>umclosing:</b> The aperture size on the screen used to close the test, µm. (or the P<sub>100</sub> size)
	* <b>F<sub>80</sub>:</b> Sample feed size in µm (and usually will provide a particle size distribution)		* <b>F<sub>80</sub>:</b> Sample feed size in µm (and usually will provide a particle size distribution)
	* <b>P<sub>80</sub>:</b> Sample finished product size in µm (and usually will provide a particle size distribution)		* <b>P<sub>80</sub>:</b> Sample finished product size in µm (and usually will provide a particle size distribution)
	* <b>gpr:</b> The average grams per revolution of the last three cycles (sometimes is labelled ''GPB'')		* <b>gpr:</b> The average grams per revolution of the last three cycles (sometimes is labelled ''GPB'')
	* <b>WiRM:</b> The calculated work index (SAGMILLING.COM uses only metric units; if the laboratory reported work index in "short ton" units, multiply that value by 1.1023 and enter the result).		* <b>WiRM:</b> The calculated work index (SAGMILLING.COM uses only metric units; if the laboratory reported work index in "short ton" units, multiply that value by 1.1023 and enter the result).

			Extra field available for modelling
			* <b>synthetic</b> indicates whether this is a real test result, or just a synthetic one that should only be used for modelling. If this column contains a value of '1' (boolean=true) for a test, then that test is understood to <u>not</u> be a real test result and is therefore not shown on the testwork comparison charts. Synthetic values are available when running circuit model simulations and do show up in the list of model results.

	=== Modelling ===		=== Modelling ===

Alex Doll at 17:49, 18 December 2012

2012-12-18T17:49:44Z

← Older revision		Revision as of 17:49, 18 December 2012
Line 3:		Line 3:
	==Testwork: Bond Rod Mill Work Index==		==Testwork: Bond Rod Mill Work Index==
	{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}		{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}
	The Bond rod mill work index is not as common as the [[Testwork: Bond ball mill work index\|Bond ball mill work index]], and there are two different variations on the mill apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these results can safely be used in the models. Bond rod mill work index results from Australian laboratories should not be used in the SAGMILLING.COM models.		The Bond rod mill work index is not as common as the [[Testwork: Bond ball mill work index\|Bond ball mill work index]], and there are two different variations on the mill apparatus. The SAGMILLING.COM models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners". Most laboratories outside of Australia use the wave liner style of machine – these results can safely be used in the models. Bond rod mill work index results from Australian laboratories with smooth liners should not be used in the SAGMILLING.COM models.

	The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test must achieve a steady-state before completion.		The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test must achieve a steady-state before completion.

Alex Doll at 22:15, 2 December 2012

2012-12-02T22:15:37Z

← Older revision		Revision as of 22:15, 2 December 2012
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	[[category:Testwork]]		[[category:Testwork]]
			[[category:Bond work index]]
	==Testwork: Bond Rod Mill Work Index==		==Testwork: Bond Rod Mill Work Index==
	{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}		{{Test\|name=Bond Rod Mill Work Index\|Abrev=Wi<sub>RM</sub>\|Alt=RWI\|F80=11 000 µm\|P80=900 µm\|Models=Bond models}}

Alex Doll at 05:25, 2 December 2012

2012-12-02T05:25:47Z

← Older revision		Revision as of 05:25, 2 December 2012
Line 17:		Line 17:

	The laboratory will report the following information:		The laboratory will report the following information:
	* <b>F<sub>80</sub>:</b> Sample feed size (and usually will provide a particle size distribution)		* <b>F<sub>80</sub>:</b> Sample feed size in µm (and usually will provide a particle size distribution)
	* <b>P<sub>80</sub>:</b> Sample finished product size (and usually will provide a particle size distribution)		* <b>P<sub>80</sub>:</b> Sample finished product size in µm (and usually will provide a particle size distribution)
	* <b>gpr:</b> The average grams per revolution of the last three cycles (sometimes is labelled ''GPB'')		* <b>gpr:</b> The average grams per revolution of the last three cycles (sometimes is labelled ''GPB'')
	* <b>WiRM:</b> The calculated work index (SAGMILLING.COM uses only metric units; if the laboratory reported work index in "short ton" units, multiply that value by 1.1023 and enter the result).		* <b>WiRM:</b> The calculated work index (SAGMILLING.COM uses only metric units; if the laboratory reported work index in "short ton" units, multiply that value by 1.1023 and enter the result).