Discussion
Cleaning line performance on a 5000 kg/h feed containing 4 per cent impurity.
| Stage | Impurity removed (kg/h) | Impurity remaining (kg/h) |
|---|---|---|
| Scalping screen | 70 | 130 |
| Aspirator | 85 | 45 |
| Grading screen | 18 | 27 |
| Destoner | 8 | 19 |
Which stage removes the largest share of the impurity present at its inlet?
Answer: D
Correct answer: The aspirator, at 85 of 130
The question asks for the largest share of what arrives, not the largest absolute quantity. The aspirator removes 85 kg/h of the 130 present at its inlet, about 65 per cent. The scalping screen removes more in absolute terms, 70 kg/h, but from an inlet of 200, which is 35 per cent, and the two later stages remove smaller fractions still.
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