Use of absorption mechanisms to decrease heavy metal mobility.
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2014-02-01
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Abstract:The objective of this project is to reduce the toxic heavy metal leaching from coal fly ash so that the fly ash may be used for road
surface or related applications. Trona (trisodium hydrogendicarbonate dihydrate, Na3HCO3CO3ยท2H2O) is injected into a flue gas
duct to control SOx emission in field tests at coal-fired power plants. While SOx decreased from emitting to air, our recent research
result showed significant increased leaching of heavy metal elements from produced fly ash to environment (water) [Yongbo Dan,
Casey Zimmerman, Kun Liu, Honglan Shi, and Jianmin Wang, Increased Leaching of As, Se, Mo, and V from High Calcium Coal
Ash Containing Trona Reaction Products, Energy & Fuels, 2013, 27:1531-1537]. In this project, we investigated the heavy metal
leaching control by replace Trona with hydrated lime. Then the collected fly ashes were leached by following EPA standard method
1312. Nine metal elements, V, Cr, As, Se, Ag, Mo, Cd, Pb, and Ba concentrations were detected by inductively coupled plasma-mass
spectrometry (ICP-MS).
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