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fly ash |
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fly ash [′flī ‚ash] (engineering) Fine particulate, essentially noncombustible refuse, carried in a gas stream from a furnace. Coal combustion residue. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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We regularly replace Portland cement in concrete with fly ash, a byproduct of coal-combustion in electric power plants, and with blast furnace slag, a byproduct of the manufacture of iron. The more carbon the fly ash contains, the better able it is to capture oxidized mercury (formed when mercury combines with chlorine, also found in coal). Fly ash is an inexpensive but highly structured filler that reduces material cost, according to James Mahler, senior v. |
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