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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Break drill core with hammer and chisel (not needed for bulk ore samples)
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Crush the sample using a jaw crusher with CSS at 20 mm
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Sieve the sample using the following (six) screen apertures:
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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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Discard flaky particles
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Divide the particles into 2 batches (for high and low energy tests) if you're doing a Full test
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There's no need to used two batches for the Light test (single energy)
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Breakage test using the Geopyörä device
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Run the calibration procedure
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Set the gap and speed for high and low or single energy tests
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Weigh and feed one particle at a time
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In Geopyörä V1 an external scale be connected to the computer
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In Geopyörä V2 the feeder and scale are already integrated to the device
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Record weights and test measurements into template spreadsheet.
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Collect the product for particle size analysis
Product size analysis
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Prepare a deck with the following (six) sieves:
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1 Pan
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1 Bond sieve
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2 sieves above t10 size
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2 sieves below t10 size
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Sieve for 5 minutes using a RoTap
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Record the following in template spreadsheet:
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Total mass
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Mass above t10 sieve
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Mass below Bond sieve
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Upload template spreadsheet into Geodata for analysis
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View preliminary results immediately and download final report after 7 days.
Density measurements (for DWI estimations)
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Select all particles above 16 mm that have not been tested
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Weight particles, suspended in air and then in water (Archimedes method)
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.
Single energy vs Two energies
Geopyörä provides two versions of its test: the single energy and the two energies model, both including SG measurement. The two energies model is the standard procedure for Geopyora's test, while the single energy model is a new offering that is currently undergoing validation. However, initial results have been promising, and Geopyora has started providing this option to its clients.
Dr. Marcos Bueno conducted simulations using the single energy version, which resulted in excellent yields. The simulations achieved an R² value of 0.93, matching the results obtained from simulations using the two energies variation.
Simulate quotation with our PRICE CALCULATOR
For a more in-depth understanding of the Geopyörä test, visit our Publications section