Which of the following is not a tumbling or revolving mill used for comminution ?
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Answer: C. Cage mill
Explanation
A cage mill utilizes high speed rotating pins for impact breakage. It relies on particle impact rather than tumbling media inside a drum. This distinguishes it fundamentally from traditional revolving tumbling mills. Tumbling mills use loose grinding media like balls, rods, or pebbles. The cylinder rotates slowly, lifting and cascading the grinding charge. Comminution occurs through a combination of impact and attrition forces.
Cement plants utilize large compartment tumbling mills for raw grinding. Mining operations rely on rod and ball mills for continuous processing. Impact mills like cage units are suited for softer friable materials. Compartment mills are multi chamber tumbling mills used in cement plants. Pebble mills use ceramic or flint pebbles as tumbling grinding media. Rod mills use long steel rods inside a rotating shell for size reduction.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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