Technical Information
Key Topics:
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Sample Preparation (from dill core sections)
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Breakage test using the Geopyörä device
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Product size analysis
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Density measurements (for DWI estimations)
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Device Specifications
The Geopyörä breakage device has the following properties:
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Dimensions: 1500 x 1000 x 1100 mm
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Weight: 400 kg
Test Concept
Geopyörä test provides specific parameters for mining and mineral processing. These parameters, along with equipment details and operating conditions, can analyze and predict comminution performance. Geopyörä measures major comminution parameters like Axb, DWI, SPI, and BWI.
The Geopyörä breakage test uses counter-rotating wheels to crush rocks with controlled reduction ratios. It allows automated feeding of rocks without stopping or resetting between breaks. The test measures applied force and energy consumption for each breakage event. The force applied depends on rock compressive strength. Varying the degree of reduction allows mapping the rock's response to force and energy. Precise measurement of absorbed energy is necessary while ensuring secure grip and compression of rocks until fracture.
Test Procedure
Sample Preparation
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Crush the sample using a jaw crusher with an adjsuted CSS at 20 mm
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Sieve the crushed material using the following (six) screen:
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> 31.5 mm
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> 26.5 mm
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> 22.4 mm
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> 19 mm
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> 16 mm
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> 13.2 mm
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Choose the largest size fraction with more than 30 particles for testing
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Avoid flaky particles
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Breakage test using the Geopyörä device
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Set the gap for the corresponding size fraction
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Weight and feed the particles
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For the Geopyörä V1 an external scale must be connected to the computer
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For the Geopyörä V2 the feeder and scale are already integrated in the device
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Performe the breakage of all sample particles
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Collect the broken product for size analysis
Size analysis
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Use a deck with the following nine sieves:
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1 Pan
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1 Bond sieve
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3 sieves below t10 size
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3 sieves above t10 size
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1 safety sieve for unborken particles
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Sieve for 5 minutes using a RoTap or similar
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Upload data into Geodata for analysis
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View results and report immediately upon data upload
Geopyörä test validation
The following section provides data comparing the accuracy of the Geopyora tests with the primary tests in the communication market. All the data presented has been collected from various papers and publications.
Geopyörä DWI comparison
The Drop Weight Index (DWi) is an important measure of rock strength, derived from the SMC Test®. Geopyörä calculates the DWi using our developed deep neural network model trained using our extensive global database, featuring reference data from multiple locations around the world.
The graph displays the parity plot of our model to the reference data. Notably, 80% of the samples fall within a 15% disparity range, with a final R squared of 0.99. These results highlight the exceptional accuracy and performance of our machine learning models.
Geopyörä Axb comparison
Geopyörä uses its breakage data to calculate the Specific Comminution Energy (Ecs) for each particle. The resulting breakage product is then sieved to determine the percentage passing one-tenth of the initial mean particle size (t10). Using the DWi calculated through our deep neural network model, Geopyörä generates the A×b parameter based on the following equation developed by Alex Doll:
The provided image presents the parity plot in which compares the estimated Axb values obtained by Geopyörä with the reference values from the SMC Test® Axb. 79% of all reference samples are within the established 15% disparity range ans with an overall R squared of 0.87.
Geopyörä BBMWI comparison
Geopyörä also utilizes a machine learning model to calculate the BBMWi (Bond Ball Mill Work Index) parameter from the data generated by our test.
The corresponding graph shows a parity plot, where 92% of the samples fall within the ±15% dispersion range, represented by the blue data points. In addition, the table provides a summary of the comparison statistics, indicating an exceptionally robust correlation, with a high parity R-Squared value of 0.99.
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For a more in-depth understanding of the Geopyörä test, visit our Publications section
