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In selecting rod mills based upon power calculated from grindability test, the following procedure has been recommended (2):
- When calculating rod mill power for a rod-milling-only application, use an inefficiency factor of 1.4 when the feed is to be prepared with open circuit crushing, and use 1.2 when the feed is to be prepared with closed circuit crushing. The mill diameter, low or high ratio of reduction, and oversize feed factors also must be applied to the calculated grinding power.
- When calculating rod mill power for a rod mill-ball mill circuit, do not allow for improvement in the ball mil performance as indicated by Table 2. If the rod mill feed is produced with open circuit crushing, apply a 1.2 inefficiency factor to the power calculated for the rod milling stage only. If the rod mill feed will consistently be 80% passing 1/2” or finer, such as produced with closed circuit crushing, do not apply a rod mill inefficiency factor. The mill diameter, low or high ratio of reduction, and oversize feed factors also must be applied to the calculated grinding power.
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