Why is the Bond
Ball Mill Grindability Test done the way it is done?
Bond Ball Mill Grindability Test is a locked-cycle laboratory grinding test. It provides
the Bond Ball Mill Work Index which expresses the resistance of a material to ball
milling. This Index is widely used in the mineral industry for comparing the resistance of
different materials to ball milling, for estimating the energy required for grinding, and
for ball mill scale-up. The test has existed for more than 40 years. However, there is
little information which explains why the test is done the way it is done. This paper uses
knowledge from past research to attempt to answer this question. It is suspected that the
test is done this way because of three reasons. First, to make the test relatively easy
and quick to carry out. Second, so that the test requires only a small amount of sample
(about 10kg). Finally, the test can give results that are suitable for ball mill scale-up
and for comparing different materialsí resistance to ball milling.