Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants

doi:10.1016/j.fuel.2019.04.055

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（2010~）

	Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants
	Fu, Biao 1,2; Liu, Guijian 1,2; Mian, Md. Manik 1; Sun, Mei 1,3; Wu, Dun 1,4
通讯作者	Liu, Guijian()
	2019-09-01
发表期刊	FUEL
ISSN	0016-2361
卷号	251 页码:593-602
摘要	This research focused on the distribution and chemical speciation of Cr, Pb, Cd, Cu, Zn, and As in fly ash and flue gas desulfurization gypsum (FGD gypsum) from a large-scale pulverized coal-fired (PC) power plants in Anhui Province of eastern China. The partitioning behavior of the heavy metals (HMs) revealed that trace metals were mainly retained in coal combustion ash (88.9-98.7%) and FGD gypsum (1.26-4.33%). Other fly ashes generated from different PC boilers and a circulated fluidized boiler (CFB) were collected to comparatively study the ash mineralogy and chemistry. The PC fly ashes were dominated by glassy materials including cenospheres, pleiospheres, ferrospheres, solid spheres, and Fe-bearing spinel, while irregular glassy particles and unburned carbon were observed in the CFB ashes. The results of SEM-EDS found that PC ash mainly consisted of < 100-mu m-diameter aluminosilicate spherical particles. In contrast, CFB ash was primarily comprised of fine irregular Al-SiCa-O agglomerates. FGD gypsums, occurring as large flaky crystals, were primarily composed of CaSO4 center dot 2H(2)O with minor quartz and calcite. According to the sequential chemical extraction procedure, the amount of HMs occurring as oxidizable associations of fluidized ash was higher than that of PC ash, which might be associated with the lower flame temperature in CFB boiler. The percentage of Cr (43.1-53.2%), Cu (79-87.8%), Zn (67.8-89.6%), and As (64.5-75.6%) as effective fraction was notably higher in FGD gypsums compared with fly ashes. The leaching tests revealed that all combustion residues were non-hazardous materials. The RACs (risk assessment codes) of Cr, Pb, Cd, and As in fly ashes indicated that they posed no risk or low risk to the ecosystem, while the HMs in all FGD gypsums showed a medium risk or high risk to the ecosystem. Therefore, the reuse of FGD gypsums should be carefully evaluated since the environmental stability of HMs in gypsums was weaker compared with fly ashes.
关键词	Fly ash FGD gypsum Heavy metals Chemical speciation Environmental implications
DOI	10.1016/j.fuel.2019.04.055
关键词[WOS]	HAZARDOUS TRACE-ELEMENTS ; CHEMICAL SPECIATION ; LEACHING CHARACTERISTICS ; HUAINAN COALFIELD ; BITUMINOUS COAL ; TOXIC ELEMENTS ; COMBUSTION ; MERCURY ; EMISSION ; BEHAVIOR
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41672144] ; Key R&D Program of Anhui Province, China[1804a0802203] ; National Key R&D Program of China[2016YFC0201600] ; Chinese Scholarship Council (CSC)
WOS研究方向	Energy & Fuels ; Engineering
项目资助者	National Natural Science Foundation of China ; Key R&D Program of Anhui Province, China ; National Key R&D Program of China ; Chinese Scholarship Council (CSC)
WOS类目	Energy & Fuels ; Engineering, Chemical
WOS记录号	WOS:000468734300056
出版者	ELSEVIER SCI LTD
引用统计	被引频次：93[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/13926
专题	黄土与第四纪地质国家重点实验室（2010~）
通讯作者	Liu, Guijian
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Shaanxi, Peoples R China 3.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China 4.Anhui Prov Bur Coal Geol, Explorat Res Inst, Hefe 23008, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Fu, Biao,Liu, Guijian,Mian, Md. Manik,et al. Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants[J]. FUEL,2019,251:593-602.
APA	Fu, Biao,Liu, Guijian,Mian, Md. Manik,Sun, Mei,&Wu, Dun.(2019).Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants.FUEL,251,593-602.
MLA	Fu, Biao,et al."Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants".FUEL 251(2019):593-602.