Question

what 'coal washing '​

Answer 1

Answer:

Coal washing involves using water and mechanical techniques and relies on gravity and the difference of density between coal and its' impurities, which are usually more densely packed due to the fact that they are inorganic. Washing coal increases its efficiency and quality, therefore increasing its price.

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Answer 2

The majority of coal cleaning processes use upward currents or pulses of a fluid such as water to fluidize a bed of crushed coal and impurities. The lighter coal particles rise and are removed from the top of the bed. The heavier impurities are removed from the bottom.