Chemical characterization and economic evaluation of the coal fly ash pre-washing and carbonation process

Alessandro Mazzella*, Massimiliano Errico, Daniela Spiga

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Abstrakt

In the present laboratory-scale study, the combination of washing and carbonation processes was examined to evaluate the feasibility to reduce the environmental impact of coal power plants. Three different washing solutions (tap, distilled and sea water) were used to pre-treat coal fly ash and the corresponding effect on direct gas-solid carbonation and final metal leaching was evaluated. Finally, a preliminary economic evaluation of the process was performed. In terms of captured CO2, the results have shown that significant amounts can be captured, although,as expected, the leaching of soluble salts in water such as Ca and Mg reduce the CO2 uptake. In terms of heavy metal’s leaching, the application of pre-washing and carbonation treatment significantly affected the metal immobilization on the final residue. The pre-washing with sea water allowed to reach a sensible improvement since only selenium, chlorides and sulphates resulted outside the range for disposing of the carbonated residue in landfill for non-hazardous waste.
OriginalsprogEngelsk
TidsskriftJournal of Chemical Technology and Metallurgy
Vol/bind54
Udgave nummer4
Sider (fra-til)855-866
ISSN1314-7471
StatusUdgivet - maj 2019

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