烧结升温方式及气氛对水洗焚烧飞灰晶体演变的影响

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Abstract

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.

Key words： washed fly ash calcination continued-heating multistep-heating

Received: 18 March 2019

PACS:

X705

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	Articles by authors
	ZHU Fen-fen
	LIU Xiao-yan
	HAN Mei-ling
	Takaoka Masaki
	Oshita Kazuyuki
	DONG Yi

Cite this article:

ZHU Fen-fen,LIU Xiao-yan,HAN Mei-ling等. Effect of heating program and atmosphere on the evolution of crystal washed fly ash during calcination[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4212-4220.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I10/4212

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