Difference between revisions of "Testwork: Crushing work index"
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+ | #REDIRECT [[Testwork: Bond crushing work index]] |
| − | ==Testwork: Bond Crushing Work Index== |
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| − | {{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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| − | 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. |
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| − | 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. |
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| − | 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. |
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| − | ===Sample Requirements=== |
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| − | The test requires 20 large lumps, minimum dimension 75 mm. When using drill core, use whole-diameter HQ or PQ size core. |
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| − | ===Test Inputs=== |
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| − | Not applicable. |
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| − | ===Test Outputs=== |
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| − | 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. |
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| − | The laboratory will report the following information: |
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| − | * <b>N° specimens:</b> The number of specimens tested (typically 20) |
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| − | * <b>min</b> The metric work index of the sample with the lowest result |
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| − | * <b>max:</b> The metric work index of the sample with the highest result |
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| − | * <b>stdev:</b> The standard deviation of metric work index of all the samples |
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| − | * <b>WiC:</b> The arithmetic average of the metric work index of all the samples |
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| − | * <b>density:</b> The water-displacement density of the specimens prior to testing, in kg/L (also referred to as 'specific gravity') |
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| − | === Modelling === |
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| − | Crushing mill work index is used in the SAGMILLING.COM [[Model:BondModel|Bond/Barratt specific energy consumption model]]. |
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| − | 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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Latest revision as of 23:04, 2 December 2012
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