Difference between revisions of "Testwork: Drop weight test"
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==Testwork: Drop Weight Tests== |
==Testwork: Drop Weight Tests== |
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| + | {{Test|name=Drop Weight Test|Abrev=DWT|Alt=JKDWT SMC A×b|F80=varies|P80=not applicable|Models=JK SimMet and Morrell}} |
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The JK drop weight testing machine is used to generate data sets for two different comminution models: |
The JK drop weight testing machine is used to generate data sets for two different comminution models: |
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| − | * |
+ | * A fitted "A" and "b" for the "E<sub>CS</sub> versus T<sub>10</sub>" test result, which is used in JK SimMet to generate particle size distributions (ergo, the appearance functions). |
| − | * |
+ | * A fitted "drop weight index" (DWI) test result, which is used in the Morrell SMC power model to predict the specific energy consumption of particle breakage for "standard particle size distributions" of a process feed and product streams. |
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. The size and quantity of the specimens is different in the JK SimMet and Morrell SMC (DWI) procedures. Generally, the DWI procedure requires fewer specimens of smaller sizes, but is much quicker (and less expensive) to operate. |
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. The size and quantity of the specimens is different in the JK SimMet and Morrell SMC (DWI) procedures. Generally, the DWI procedure requires fewer specimens of smaller sizes, but is much quicker (and less expensive) to operate. |
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The drop weight test for use in the Morrell SMC model requires minimum 8 kg with sized between 25-40 mm (though smaller dimensions can be substituted if the coarser material is not available). |
The drop weight test for use in the Morrell SMC model requires minimum 8 kg with sized between 25-40 mm (though smaller dimensions can be substituted if the coarser material is not available). |
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| − | === |
+ | ===Test Inputs=== |
| + | Not applicable |
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| + | ===Test Outputs=== |
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| + | * The "full" JK DWT returns a separate value for the fitted parameters '''A''' and '''b''' (which are frequently multiplied together and reported as '''A×b'''), |
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| + | ** A table of ''Appearance values'' for a crusher model are provided. |
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| + | ** A companion tumbling test is conducted that returns a '''ta''' value. |
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| + | |||
| + | * The SMC test returns a Drop-Weight Index '''DWI''' value. |
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| + | ** Inferred '''A''', '''b''' (, '''A×b''') and '''ta''' are provided for people who intend to use the JK SimMet software. |
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| + | ** Derived output values for '''Mia ''' (for SAG milling), '''Mic''' (for crushing) and '''Mih''' (for high-pressure grinding rolls) are provided for doing power-based calculations, such as those in SAGMILLING.COM. |
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| + | ===Modelling=== |
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| + | JK SimMet, which is a population-balance model, uses the '''A''' and '''b''' values to predict the ''t<sub>10</sub>'' generated by a certain breakage energy ''E<sub>CS</sub>''. This ''t<sub>10</sub>'' is then extended to create an ''appearance matrix'' used to predict the particle size distribution of a breakage event. |
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| + | In the Morrell SMC model, the <b>Mia</b> value is used to predict the specific energy consumption of a SAG mill. When combined with an <b>Mib</b> value (obtained as a modified output of a Bond ball mill work index test), the total specific energy consumption of a grinding circuit can be predicted. |
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| + | ===Trademarks & Licensing=== |
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* JK SimMet and JK DWT are trade marks of the Julius Kruttschnitt Mineral Research Centre, Indooroopilly, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation. |
* JK SimMet and JK DWT are trade marks of the Julius Kruttschnitt Mineral Research Centre, Indooroopilly, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation. |
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| − | * SMC and DWI are trade marks of SMC Testing Pty Ltd, Chapel Hill, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation. |
+ | * SMC Test and DWI are trade marks of SMC Testing Pty Ltd, Chapel Hill, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation. |
Revision as of 01:17, 18 December 2012
Contents
Testwork: Drop Weight Tests
| Test name | ||||
| Drop Weight Test | ||||
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| Models | ||||
| JK SimMet and Morrell |
The JK drop weight testing machine is used to generate data sets for two different comminution models:
- A fitted "A" and "b" for the "ECS versus T10" test result, which is used in JK SimMet to generate particle size distributions (ergo, the appearance functions).
- A fitted "drop weight index" (DWI) test result, which is used in the Morrell SMC power model to predict the specific energy consumption of particle breakage for "standard particle size distributions" of a process feed and product streams.
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. The size and quantity of the specimens is different in the JK SimMet and Morrell SMC (DWI) procedures. Generally, the DWI procedure requires fewer specimens of smaller sizes, but is much quicker (and less expensive) to operate.
Sample Requirements
The drop weight test for use in JK SimMet, referred to here as the "full drop weight test", requires approximately 100 kg of material with a top size of 75-100 mm. When using drill core, this requires whole-diameter PQ core.
The drop weight test for use in the Morrell SMC model requires minimum 8 kg with sized between 25-40 mm (though smaller dimensions can be substituted if the coarser material is not available).
Test Inputs
Not applicable
Test Outputs
- The "full" JK DWT returns a separate value for the fitted parameters A and b (which are frequently multiplied together and reported as A×b),
- A table of Appearance values for a crusher model are provided.
- A companion tumbling test is conducted that returns a ta value.
- The SMC test returns a Drop-Weight Index DWI value.
- Inferred A, b (, A×b) and ta are provided for people who intend to use the JK SimMet software.
- Derived output values for Mia (for SAG milling), Mic (for crushing) and Mih (for high-pressure grinding rolls) are provided for doing power-based calculations, such as those in SAGMILLING.COM.
Modelling
JK SimMet, which is a population-balance model, uses the A and b values to predict the t10 generated by a certain breakage energy ECS. This t10 is then extended to create an appearance matrix used to predict the particle size distribution of a breakage event.
In the Morrell SMC model, the Mia value is used to predict the specific energy consumption of a SAG mill. When combined with an Mib value (obtained as a modified output of a Bond ball mill work index test), the total specific energy consumption of a grinding circuit can be predicted.
Trademarks & Licensing
- JK SimMet and JK DWT are trade marks of the Julius Kruttschnitt Mineral Research Centre, Indooroopilly, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation.
- SMC Test and DWI are trade marks of SMC Testing Pty Ltd, Chapel Hill, Australia. Laboratories performing this test pay a royalty when submitting raw results for interpretation.
