fly ash

noun
1.
fine particles of ash of a solid fuel carried out of the flue of a furnace with the waste gases produced during combustion.
2.
such ash recovered from the waste gases, used chiefly as a reinforcing agent in the manufacture of bricks, concrete, etc.

Origin:
1930–35

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World English Dictionary
fly ash
 
n
fine solid particles of ash carried into the air during combustion, esp the combustion of pulverized fuel in power stations

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We can make a similar concrete by utilizing the fly ash from coal fired power plants.
Burning coal is nasty business, concentrating all kinds of toxic metals and resulting in potentially deadly fly ash.
Coal fly ash can be used as a mineral filler in hot mix asphalt paving applications.
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