Effect of heating program and atmosphere on the evolution of crystal washed fly ash during calcination
ZHU Fen-fen1, LIU Xiao-yan1, HAN Mei-ling1, Takaoka Masaki2, Oshita Kazuyuki2, DONG Yi1
1. School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China;
2. Department of Environmental Engineering, Kyoto University, Kyoto 615-8540, Japan
In order to optimize the stabilization of washed municipal solid waste incineration (MSWI) fly ash (FA) by calcination, the influence of the heating method (continued-heating, multistep-heating) and atmosphere conditions on the evolution of crystal composition in washed FA was discussed. Three kinds of FA (RFA-II#、CaFA-II# and NaFA-II#) were tested and compared. RFA was the boiler fly ash (RFA), CaFA and NaFA were FA resulted from discharged gas neutralized by CaO/Ca(OH)2 and NaHCO3 respectively, and "II#" means they were dried residues treated by a double washing process. The results indicate that continued-heating was easier to form solid solution to stabilize heavy metals, and 700℃ was the turning point after which the crystal in three FAs changed obviously. The FA neutralized by NaHCO3 was better to stabilize heavy metals. The simulation results from Factsage were consistent with the XRD results, and it was found that HCl was the first evaporation chloride released from the washed FA during the calcination process.
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ZHU Fen-fen, LIU Xiao-yan, HAN Mei-ling, Takaoka Masaki, Oshita Kazuyuki, DONG Yi. Effect of heating program and atmosphere on the evolution of crystal washed fly ash during calcination. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4212-4220.
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