Agbenuvor, Antonio, Jokovic,and Morrison
Published in Proceedings of the IMPC2020 Congress, SAIMM
ABSTRACT
Body breakage usually involves breakage of particles by compression between two surfaces or impacted against a rigid surface, with the latter of interest in this current study. This mode of breakage has been identified to be the most elementary size reduction process and the most effective breakage process in comminution devices. It has been found in the literature that the progenies produced from this form of breakage possess a residual velocity at which they move, after the breakage event.
In the pursuit of efficiently utilising applied comminution energy, a laboratory-scale breakage device has been developed to deliver precise specific impact breakage using the concept of a fast-moving hammer and a slow-moving particle to effect breakage. The residual velocities of the progenies from the breakage event may be used to generate secondary breakage without further addition of energy if the particle encounters a stiff obstacle such as a steel plate at right angles to its path.
To measure the extent of secondary breakage, the steel wall of the device was lined with a rubber material to suppress the second set of breakage events. The performance of the new device is analysed, based on calculated t10values and measured residual velocities of the moving daughter particles. Testing involving anvils showed a much finer PSD and higher t10compared to the test involving rubber lining. This finding is corroborated by the measured residual velocities of the progenies. The resulting energies calculated from the measured residual velocities of the progeny were found to be approximately 42-88% of the primary specific impact energy. This retained energy was found to be sufficient for secondary breakage.
Keywords
Impact breakage, residual velocity, secondary breakage, energy utilisatio
ACKNOWLEDGEMENTS
The study was conducted with funding from the Australian Government’s Cooperative Research Centre (CRC) for Optimising Resource Extraction, CRCORE P3-008 Project. CRC ORE is part of theAustralian Government’s CRC Program, which is made possible through the investment and ongoing support of the Australian Government. The CRC Program supports industry-led collaborations between industry, researchers and the community.
AUTHORS
B.S. Agbenuvora*, C. Antonioa, V. Jokovica,and R. Morrisonb
aJulius Kruttschnitt Mineral Research Centre, University of Queensland, Indooroopilly, Brisbane, 4068 QLD, Australia
bHonorary Professor, Julius Kruttschnitt Mineral Research Centre, University of Queensland, Indooroopilly, Brisbane, 4068 QLD, Australia
*Corresponding author: