Elsevier

Minerals Engineering

Volume 168, 1 July 2021, 106905
Minerals Engineering

The double wheel breakage test

https://doi.org/10.1016/j.mineng.2021.106905Get rights and content
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Highlights

  • The mining industry needs a low-cost and reliable breakage characterization test.

  • A shortcoming in the existing tests is the application of fixed comminution energy.

  • A new device is capable of rapidly testing rocks by measuring actual energy use.

  • Individual measurements show precision with a standard deviation of 1.07 Joules.

  • Results show a good agreement with a commercial JK Drop Weight Test and SMC Test on control samples.

Abstract

The mining industry needs a low-cost and reliable breakage characterization test which can rapidly process a large number of samples for geometallurgical modelling. The more samples are tested, the better is the understanding of the ore hardness variability and lower the design or production risks. The proposed solution is a new testing device, herein named Geopyörä, which is a variation of a roll crusher with an adjustable gap and instrumentation to measure breakage forces and energy applied to rock particles during the breakage process. The principle utilises a controlled degree of crushing, with absorbed breakage energy being a response rather than an input. The new testing device is capable of rapidly testing rocks over a wide range of sizes and accurately measured energy levels. For a range of ores, the results were demonstrated to provide outputs that replicate the breakage modelling from full JK drop Weight tests. In addition to being suited to testing drill cores and small sample masses, the Geopyörä provides a distribution of particle strengths within every sample. This paper provides an introduction to the concept, development of the prototype device and breakage calibration results that indicate its potential to become a major player in geometallurgical ore testing.

Keywords

Geometallurgy
Comminution
Ore breakage characterization
Variability

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