The Geopyörä breakage test for geometallurgy
Updated: Sep 10
Paper submitted to the XXX International Minera processing Congress 2021 (in press)
Comminution tests are an essential element in the design of ore beneficiation plants. Several methods have been developed to assess the breakage characteristics of rocks to generate parameters for modelling. However, most of the existing methods are laborious, expensive and require large samples. Consequently, test work has been traditionally conducted with a few representative reference samples. On the other hand, geometallurgical modelling programs require an extensive amount of test work to allow understanding the variability of ore properties within the deposit and establish spatial geometallurgical domains that show the differential responses to mineral processing. Therefore, comminution tests for geometallurgy need to be more effective in terms of time, cost and sample size. This paper introduces a new testing device (Geopyörä) which is capable of measuring forces and energy applied to rock particles during the breakage process. The new testing method uses smaller samples and can be up to 50 times faster than any other test in the market (e.g. JKDWT, JKRBT, SMC test® and SPI). This paper presents the concept prototype and the preliminary test work results, which have been benchmarked against the industry standard JKDWT Axb parameter as well as Bond ball mill grinding tests.
Key words: Geometallurgy, comminution, ore breakage characterization, variability.