For the preliminary breaking of hard rock, we use a____________________?
Correct answer: B. Gyratory crusher
- A. Ball mill
- B. Gyratory crusher
- C. Tube mill
- D. Squirrel-cage disintegrator
Explanation
A gyratory crusher is a primary crusher designed for the preliminary breaking of large, hard rock. Ball mills and tube mills perform fine grinding, while a squirrel-cage disintegrator is used for less demanding size reduction.
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