Discussion
A cement mill produces 120 tonnes an hour with a separator return of 240 tonnes an hour. What is the circulating load as a percentage?
Answer: C
Correct answer: 200 per cent
The circulating load is the returned material as a percentage of the finished product: \[ \frac{240}{120} \times 100 = 200\ \mathrm{per\ cent}. \] The mill itself is therefore handling 360 tonnes an hour to deliver 120, which is normal for a closed circuit and is what allows the separator to keep the product uniform.
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