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Grinding mill throughput problems (1 reply)
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I have a pendulum roller mill with closed circuit air classifier that is used for the dry fine grinding (d50--10 micron/ d97--18 micron) of calcium carbonate.
The grinding mechanism of the pendulum roller mill does not rely significantly, to the best of my understanding, on the impact between the calcite particles. Rather, the grinding mechanism is mostly particle abrasion against the rolling media.
I have tried without success to increase the throughput of this mill by lowering the particle size of the entering feed.
However, no matter how much I lower the particle size of the feed, there is no appreciable difference in the throughput. For purposes of this question, please note that the calcite ore I use is from the same pit in the same mine and has consistent mineralogy. Also, the grinding mill feed is sieved beforehand to provide a steep particle size distribution. Finally, the feedrate into the mill, which is controlled automatically, has been held constant.
Has anyone run into an issue like this before? Is it a question of classifier efficiency? Thanks.