Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?
Correct answer: C. 1.34
- A. 1.0
- B. 0.5
- C. 1.34
- D. 4.34
Explanation
Dry grinding generally requires more energy than wet grinding because liquid reduces agglomeration and improves transport of particles. The standard correction is to multiply the wet-grinding work index by 1.34.
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