Discussion
Screen performance at four feed rates on a fixed deck area.
| Feed (t/h) | Bed depth (mm) | Undersize recovery | Effectiveness |
|---|---|---|---|
| 3.0 | 12 | 0.96 | 0.93 |
| 4.5 | 18 | 0.93 | 0.89 |
| 6.0 | 26 | 0.86 | 0.81 |
| 7.5 | 38 | 0.72 | 0.66 |
What does the table demonstrate?
Answer: A
Correct answer: Effectiveness falls as the bed deepens
Read the two middle columns together: as the feed rises from 3.0 to 7.5 t/h the bed deepens from 12 to 38 mm and effectiveness falls from 0.93 to 0.66. Undersize buried in a deep bed never reaches the deck to be presented to an aperture. This is the capacity against effectiveness trade that governs every screening decision.
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