Definitions for "Fly ash"
Keywords:  ash, flue, combusted, coal, particulate
Fly ash refers to the fine particles contained in the gases that are released when coal is burned.
A fine residue that results from the combustion of ground or powdered coal. May be used in either concrete or flowable fill.
The fine particles of ash that are carried through the various passes in the furnace by the products of combustion and are usually collected in the last pass of boiler by a precipitator or dust collector.