Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
Correct answer: B. Froth floatation
- A. Trough washer
- B. Froth floatation
- C. Spiral separator
- D. Baum jig washer
Explanation
Froth flotation is suitable for very fine coal because hydrophobic coal particles attach to air bubbles and float, while mineral impurities remain in the water. Gravity washers such as jigs and trough washers are more effective for coarser particles.
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