Which of the following is used for primary crushing of very hard lumpy materials ?
Correct answer: B. Gyratory crusher
- A. Toothed roll crusher
- B. Gyratory crusher
- C. Ball mill
- D. Tube mill
Explanation
A gyratory crusher is designed for primary crushing and can accept large, very hard lumps continuously under compression. Ball and tube mills are fine-grinding equipment, while toothed rolls are generally less suitable for extremely hard rock.
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