Testwork: Bond crushing work index - Revision history

Alex Doll: /* Test Outputs */

2022-11-11T15:29:25Z

Test Outputs

Alex Doll: /* Test Outputs */

2015-07-24T19:25:54Z

Test Outputs

Alex Doll: /* Test Outputs */

2012-12-18T00:01:55Z

Test Outputs

Alex Doll: /* Testwork: Bond Crushing Work Index */

2012-12-17T22:32:34Z

Testwork: Bond Crushing Work Index

Alex Doll at 22:15, 2 December 2012

2012-12-02T22:15:56Z

Alex Doll: Created page with "category:Testwork ==Testwork: Bond Crushing Work Index== {{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=Wi_C|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm..."

2012-12-02T22:03:48Z

Created page with "category:Testwork ==Testwork: Bond Crushing Work Index== {{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=WiC|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm..."

New page

[[category:Testwork]]

==Testwork: Bond Crushing Work Index==
{{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=WiC|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm|Models=Bond models}}
The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the [[Testwork: Bond ball mill work index|Bond ball mill work index]], and it is a notoriously noisy test.

The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus. Typically twenty specimens are chosen to represent a sample and the result reported is the average of those specimens.

There is a high-energy impact work index which is a different (and incompatible) test. The high-energy test has fallen into disuse and any recent (post year 2000) test labelled as a "crushing work index" can confidently be assumed to be the low-energy impact test.

===Sample Requirements===

The test requires 20 large lumps, minimum dimension 75 mm. When using drill core, use whole-diameter HQ or PQ size core.

===Test Inputs===

Not applicable.

===Test Outputs===

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.

The laboratory will report the following information:
* N° specimens: The number of specimens tested (typically 20)
* min The metric work index of the sample with the lowest result
* max: The metric work index of the sample with the highest result
* stdev: The standard deviation of metric work index of all the samples
* WiC: The arithmetic average of the metric work index of all the samples
* density: The water-displacement density of the specimens prior to testing, in kg/L (also referred to as 'specific gravity')

=== Modelling ===
Crushing mill work index is used in the SAGMILLING.COM [[Model:BondModel|Bond/Barratt specific energy consumption model]].

The work index is used to calculate the energy requirement to break rocks in the coarse size range, from >100 mm down to about 10 mm - 20 mm.

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 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 ===

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 * <b>WiC:</b> The arithmetic average of the metric work index of all the samples
 * <b>density:</b> The water-displacement density of the specimens prior to testing, in kg/L (also referred to as 'specific gravity')
 === Modelling ===

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 [[category:Testwork]]
 [[category:Bond work index]]
 ==Testwork: Bond Crushing Work Index==
 {{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=Wi<sub>C</sub>|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm|Models=Bond models}}

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 ===Test Outputs===
-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.
+SAGMILLING.COM uses only metric work index units; if the laboratory reported work index in "short ton" units, multiply that value by 1.1023 and enter the result.
 The laboratory will report the following information:

Testwork: Bond crushing work index - Revision history

Alex Doll: /* Test Outputs */

Alex Doll: /* Test Outputs */

Alex Doll: /* Test Outputs */

Alex Doll: /* Testwork: Bond Crushing Work Index */

Alex Doll at 22:15, 2 December 2012

Alex Doll: Created page with "category:Testwork ==Testwork: Bond Crushing Work Index== {{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=WiC|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm..."

Alex Doll: Created page with "category:Testwork ==Testwork: Bond Crushing Work Index== {{Test|name=Bond Low-Energy Impact Crushing Work Index|Abrev=Wi_C|Alt=CWI IWI LEIT|F80=100 mm|P80=20 mm..."