fly ash(redirected from Coal ash)
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Fine particulate ash sent up by the combustion of a solid fuel, such as coal, and discharged as an airborne emission or recovered as a byproduct for various commercial uses.
(Chemistry) fine solid particles of ash carried into the air during combustion, esp the combustion of pulverized fuel in power stations
fine particles of ash carried out of the flue of a furnace with the waste gases produced during combustion.