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By which process does the impurities of coal are generally removed?

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By which process does the impurities of coal are generally removed?

(a) Screening process

(b) Sorting

(c) Blending

(d) Wet washing

The question was asked in an online interview.

This question is from Coal Technology topic in chapter Fuels and Combustion of Engineering Chemistry II

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Best answer
Correct choice is (d) Wet washing

The explanation is: Jig washers and water cyclones are used for the removal of impurities of coal by wet washing. Wet washing is affected with the help of water or a dense medium as the sorting liquid. This process is used for making the density of the clean coal and impurities same.

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