Difference between revisions of "Conversions between test types"
(Created page with "[category:testwork] ==Converting between comminution test types== Different tests are used in different grindability models for substantially the same purposes. Certain grind...") |
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+ | | '''Bond rod mill Wi versus A×b for copper porphyries'''<br> A slightly better relationship can be determined if the database is limited to projects of a similar lithology. Limiting to only the Andean copper porphyry projects results in a slightly better correlation. |
+ | || [[File:Twcompare_axb_vs_wirm.svg|Published A×b and Wi<sub>RM</sub> results for Andean porphyries]] |
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+ | | '''Non-bond rod mill work index versus A×b''' <br> Only considering rod mill work index tests performed in laboratory mills equipped with smooth liners gives a different relationship. These work index mills are typical of laboratories in Australia and are not consistent with the specification of F. Bond. |
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|| [[File:ExampleDB-Aussie_WiRMvAxb-comparison.png]] |
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Revision as of 21:10, 26 January 2015
[category:testwork]
Converting between comminution test types
Different tests are used in different grindability models for substantially the same purposes. Certain grindability tests are compatible with other tests, and an approximate conversion can be established by comparing to a database of testwork.
The determination of which tests are compatible with other tests is largely a function of the particle size of the specimens subjected to testing.Doll & Barratt, 2011 Ore properties also play a role because some tests are sensitive to changes in ore density and other tests operate with a biased sample consisting only of competent pieces.
Medium size class
The three tests in the medium size class are:
- Bond rod mill work index (WiRM)
- SAG Grindability index (SGI) or SAG Power index (SPI™)
- Drop weight test, both JK and SMC (A×b, DWI, Mia, etc)