Froth floatation is used for_________________?
Correct answer: C. Washing fine coal dust (< 0.5 mm size)
- A. Removing ash from the coal based on difference in specific gravity of coal and ash
- B. Washing lump coal (> 80 mm size)
- C. Washing fine coal dust (< 0.5 mm size)
- D. All A., B. and C.
Explanation
Froth flotation is particularly suitable for fine coal particles, where hydrophobic coal attaches to air bubbles and rises as froth. Lump coal is treated by screening or gravity methods, so the method is not applicable to all three listed cases.
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