Single particle impact tests such as the JK rotary breakage test (JKRBT) have historically been conducted at rather coarse particle sizes (typically greater than 10 mm) and high energies (0.5 - 3 KWh/t). Whereas, fine particle competency tests such as the Bond test, utilise multiple low energy collisions within particle beds. This has led to a discontinuous understanding of ore competence across different particle sizes and breakage mechanisms. Extension of single particle impact characterisation tests to finer sizes and lower energies has enabled a consistent measure of rock competence. These single particle measurements also give an indication of the practical minimum energy requirements to achieve a certain size. Thus, a comparison of the Bond and bed breakage products with the single particle tests, enabled an breakage efficiency spectrum to be developed. This technique can be applied in plant-scale applications such as calculating the most favourable transfer size between stages of comminution to optimise the whole circuit.
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