17 Dai S F, Ren D Y, Chou C L, et al. Mineralogy and geochemistry of the No. 6 coal (Pennsylvanian) in the Jungar Coalfield, Ordos Basin, China. Int J Coal Geol, 2006, 66: 253-270
[18]
18 Dai S F, Li D, Chou C L, et al. Mineralogy and geochemistry of boehmite-rich coals: New insights from the Haerwusu Surface Mine, Jungar Coalfield, Inner Mongolia, China. Int J Coal Geol, 2008, 74: 185-202??
27 Ketris M P, Yudovich Y E. Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals. Int J Coal Geol, 2009, 78: 135-148??
29 Conzemius F J. Elementary partitioning in fly ash depositories and material balances for a coal burning facility by spark source mass-spectrometry. Environ Sci Technol, 1984, 18: 12-18??
[30]
30 Ratafia-Brown J A. Overview of trace element partitioning in flames and furnaces of utility coal-fired boilers. Fuel Process Technol, 1994, 39: 739-758
[31]
31 Fang Z, Gesser H D. Recovery of gallium from coal fly ash. Hydrometallurgy, 1996, 41: 187-200??
[32]
32 Gutiérrez B, Pazos C, Coca J. Recovery of gallium from coal fly ash by a dual reactive extraction process. Waste Manage Res, 1997, 15: 371-382
[33]
33 Dai S F, Zhao L, Peng S P, et al. Abundances and distribution of minerals and elements in high-alumina coal fly ash from the Jungar Power Plant, Inner Mongolia, China. Int J Coal Geol, 2010, 81: 320-332??
[34]
34 Llorens J F, Fernandez-turiel J L, Querol X. The fate of trace elements in a large coal-fired power plant. Environ Geol, 2000, 40: 409-415??
45 Kopeykin V A. Geochemical features of the behavior of gallium in laterization. Geochem Int, 1984, 21: 162-166
[46]
46 吕云阳, 曾文臻. 无机化学丛书, 第二卷, 镓分族. 北京: 科学出版社. 1998
[47]
47 Palmer C A, Lyons P C. Selected elements in major minerals from bituminous coal as determined by INAA: Implications for removing environmentally sensitive elements from coal. Int J Coal Geol, 1996, 32: 151-166??
49 Taylor S R, MeLennan S M. The Continental Crust: Its Composition and Evolution. Blackwell: Melbourne, 1985. 28-29
[50]
50 Murray R W, Leinen M. Scavenged excess aluminum and its relationship to bulk titanium in biogenic sediment from the central equatorial Pacific Ocean. Geochim Cosmochim Acta, 1996, 60: 3869-3878??
57 Bates D A. Geology. In: Wills J B, ed. Agriculture and Land Use in Ghana. Accra: Oxford University Press, 1962. 51-61
[58]
58 Wang J, Li C Q, Sakanishi K, et al. Investigation of the remaining major and trace elements in clean coal generated by organic solvent extraction. Fuel, 2005, 84: 1487-1493
66 Eskenazy G M. Adsorption of gallium on peat and humic Acids. Fuel, 1967, 46: 187-191
[67]
67 Given P H, Miller R N. The association of major, minor and trace inorganic elements with lignites. III. Trace elements in four lignites and general discussion of all data in this study. Geochim Cosmochim Acta, 1987, 51: 1843-1853 ??