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• W2527777557 abstract "Abstract The coals from the Jungar Coalfield, Inner Mongolia, China, have been found to be enriched in Ga and Li. These are valuable metals that are potentially recoverable from coals and/or coal combustion residues. Based on fifteen roof/floor/parting samples collected from one borehole and one hundred and forty one bulk coal samples collected from three boreholes in the Buertaohai-Tianjiashipan coal mining district, Jungar Coalfield, this paper reports new data on the mineral compositions and geochemical characteristics of the Jungar Li-Ga-rich coals, and provides new evidence for the origin and mode of occurrence of Al, Ga and Li in these coals. The main mineral phases occurring in the coals are kaolinite, boehmite, calcite, with small proportions of quartz, pyrite, ankerite, siderite, and trace amounts of microcline and rectorite. An unusual mineral phase, svanbergite (SrAl 3 (PO 4 )(SO 4 )(OH) 6 ) also occurs as a main mineral constituent in the studied coals. The mineral phases in the roof/floor/parting samples are dominantly kaolinite, with a small proportion of quartz. Kaolinite is of both terrigenous and authigenic origin, which were possibly derived from terrigenous Yinshan Oldland sediment-source region and/or from recrystallization during the coal formation process. Boehmite and svanbergite are primarily of authigenic origin, and were dominantly derived from the weathered bauxite sediment-source region. Calcite may have formed by dissolution of limestone layers close to the margin of coal basin and subsequent deposition of the Ca or Mg-rich carbonates in the cells/fractures of the coal seams. Sulfide minerals in fractures may have been precipitated from epithermal fluids. Rectorite was probably formed by the reaction of kaolinite with epigenetic low-temperature hydrothermal fluids during diagenesis. Compared to common Chinese and worldwide coals, the studied Jungar coals are much more enriched in Al (4.4–6.1%), Li (70–79 mg/kg), and Ga (14–19 mg/kg). Titanium, P, Sr, Zr, Nb, Th, Ta, Hf, and rare earth elements (REEs) are also enriched in the studied coals to some extent. Aluminum in the coals mainly occurs in the form of kaolinite and boehmite, whereas, lithium may be associated with aluminosilicate minerals (kaolinite and illite if present) as well as svanbergite. Gallium principally occurs in kaolinite, and to a lesser extent, svanbergite. Strontium, P, and LREEs (La, Ce, and Rr, Nd and Sm) mainly present in svanbergite. The source of Li and Ga in Jungar coals is most likely from the Yinshan Oldland region, but there is also a possibility of migration from bauxite of the Benxi formation." @default.
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• W2527777557 date "2016-10-01" @default.
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• W2527777557 title "Mineral composition and geochemical characteristics of the Li-Ga-rich coals in the Buertaohai-Tianjiashipan mining district, Jungar Coalfield, Inner Mongolia" @default.
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• W2527777557 doi "https://doi.org/10.1016/j.coal.2016.09.018" @default.
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