Effect of various grinding mechanisms during particle production
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Date
2018-06
Authors
Muhammad Ihsan Firdaus Mazlee
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Abstract
There are several types of grinding machines that were used in industry such as
ball mill, planetary mill, jet mill, stirred mill and ring mill. These machines share the same
purpose that is to reduce the size of a sample. Moreover, in a grinding process,
mechanisms of grinding like impact and abrasion took place. These mechanisms can be
manipulated as it varies with operating parameter. Two types of samples were used in this
experiment that is limestone and granite. 20kg of each sample were crushed with jaw
crusher and cone crusher. Then, the samples undergoes several grinding machines with
different type of operating parameter. The grinding machine used were ball mill,
planetary mill and ring mill. The results obtained show that ball mill and planetary mill
at high rotational speed, the impact mechanism will be dominant, whilst at low rotational
speed, the abrasion mechanism is more dominant. For different size of grinding media for
ball mill, 45mm steel ball shows that it can reduce coarser material but 27mm steel ball
shows that smaller size material are grind efficiently. For different number of ball or BPR,
shows that 10:1 BPR produce impact mechanisms while 3:1 BPR gives abrasion
mechanism. For ring mill, it produces very fine product in a short time due to high
intensity of impact and abrasion. Moreover, for different type of machine, ball mill
produces much wider size distribution if compared to planetary and ring mill. For
different type of sample, granite are hard to grind compared to limestone due to higher
strength.