Effect of ball size distribution on milling parameters
Date
2010-03-16T12:28:39Z
Authors
Katubilwa, Francois Mulenga
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Abstract
This dissertation focuses on the determination of the selection function parameters ,
a, , and together with the exponent factors and describing the effect of ball
size on milling rate for a South African coal.
A series of batch grinding tests were carried out using three loads of single size
media, i.e. 30.6 mm, 38.8 mm, and 49.2 mm. Then two ball mixtures were
successively considered. The equilibrium ball mixture was used to investigate the
effect of ball size distribution on the selection function whereas the original
equipment manufacturer recommended ball mixture was used to validate the model.
Results show that with the six parameters abovementioned estimated, the charge
mixture is fully characterized with about 5 – 10 % deviation. Finally, the estimated
parameters can be used with confidence in the simulator model allowing one to find
the optimal ball charge distribution for a set of operational constraints.