What is another word for fly ash?
Pronunciation: [flˈa͡ɪ ˈaʃ] (IPA) 
Fly ash, also known as coal ash, is a fine-grained, powdery residue generated by burning coal in power plants. It is primarily composed of silica, alumina, iron, and calcium, but also contains trace elements like arsenic, cadmium, and mercury. Fly ash is usually collected in ash ponds or landfills, and can have negative environmental impacts if not properly managed. In addition to fly ash, other terms used to describe coal ash include bottom ash, boiler slag, and flue gas desulfurization gypsum. These synonyms indicate different types or sources of coal combustion residue, but all have similar composition and potentialities for reuse in various industries.
