Characterization of Aluminosilicates in Fly Ashes with Different Melting Points Using Al-27 Magic-Angel Spinning Nuclear Magnetic Resonance

doi:10.1021/acs.energyfuels.7b01466

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	Characterization of Aluminosilicates in Fly Ashes with Different Melting Points Using Al-27 Magic-Angel Spinning Nuclear Magnetic Resonance
	Kang, Zhizhong 2; Tian, Sida 2; Xu, Hong 2; Zhuo, Yuqun 1; Fang, Yongxu 2; Chen, Lei 3
刊名	ENERGY & FUELS
	2017-09-01
卷号	31 期号:9 页码:10068-10074
DOI	10.1021/acs.energyfuels.7b01466
文献子类	Article
英文摘要	Knowledge of the effect of aluminosilicates in fly ash on slagging is very important for the prevention and control of slagging in coal-fired boilers. To understand hydrochloric acid dissolution of the aluminum element of fly ash aluminosilicates at a chemical coordination level and establish a reliable method to characterize fly ash aluminosilicates that easily cause slagging, we performed hot hydrochloric acid separation for fly ashes with different melting points obtained from four power plants in China and measured the acid-solubility of major elements in the fly ashes. The fly ashes and their acid separation residues were analyzed using X-ray diffraction and Al-27 magic-angle spinning nuclear magnetic resonance (Al-27 MAS NMR). The results show that the 6-fold coordinated aluminum (denoted as Al(VI)) in the fly ashes does not easily dissolve in hot hydrochloric acid. One part of the 4-fold coordinated aluminum (denoted as Al(IV)) easily dissolves in hydrochloric acid. The acid-soluble Al(W) in ash has stronger quardapolar interactions than the Al(IV) of mullite, and the excess negative charges of the AlO4 tetrahedron are compensated by active metal cations. The aluminosilicates containing a large amount of acid-soluble Al(IV) are easily slagged. In the fly ashes with high melting point, the mullite and corundum contents are high; the Al(W) content is low, and the acid-soluble Al(IV) is minor. In the fly ashes with low melting point, the aluminosilicates are mainly amorphous substances; the Al(W) content is high, and the acid-soluble Al(W) content is more. Therefore, the acid-soluble aluminum fraction of fly ash can be used to characterize the slagging propensity of aluminosilicates in fly ash.
WOS关键词	SOLID-STATE NMR ; CHEMICAL-COMPOSITION ; QUADRUPOLAR NUCLEI ; COAL ; MINERALOGY ; MULLITE ; COMBUSTION ; DEPOSITION ; PHASES ; FUELS
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
WOS记录号	WOS:000411771200129
资助机构	National Science Foundation of China(51376061) ; National Science Foundation of China(51376061) ; National Science Foundation of China(51376061) ; National Science Foundation of China(51376061)
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/11411]
专题	武汉物理与数学研究所_高技术创新与发展中心
作者单位	1.Tsinghua Univ, Thermal Engn Dept, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China 2.North China Elect Power Univ, Sch Energy Power & Mech Engn, Key Lab Condit Monitoring & Control Power Plant E, Minist Educ, Beijing 102206, Peoples R China 3.Chinese Acad Sci, Wuhan Inst Phys & Math, Natl Ctr Magnet Resonance Wuhan, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Kang, Zhizhong,Tian, Sida,Xu, Hong,et al. Characterization of Aluminosilicates in Fly Ashes with Different Melting Points Using Al-27 Magic-Angel Spinning Nuclear Magnetic Resonance[J]. ENERGY & FUELS,2017,31(9):10068-10074.
APA	Kang, Zhizhong,Tian, Sida,Xu, Hong,Zhuo, Yuqun,Fang, Yongxu,&Chen, Lei.(2017).Characterization of Aluminosilicates in Fly Ashes with Different Melting Points Using Al-27 Magic-Angel Spinning Nuclear Magnetic Resonance.ENERGY & FUELS,31(9),10068-10074.
MLA	Kang, Zhizhong,et al."Characterization of Aluminosilicates in Fly Ashes with Different Melting Points Using Al-27 Magic-Angel Spinning Nuclear Magnetic Resonance".ENERGY & FUELS 31.9(2017):10068-10074.