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Anomalous Concentrations of Rare Metal Elements, Rare‐scattered (Dispersed) Elements and Rare Earth Elements in the Coal from Iqe Coalfield, Qinghai Province, China
Author(s) -
Yuzhuang SUN,
Cunliang ZHAO,
Yanheng LI,
Jinxi WANG
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12407
Subject(s) - kaolinite , coal , rare earth element , rutile , rare earth , mineralogy , inductively coupled plasma mass spectrometry , chemistry , mineral , siderite , metal , environmental chemistry , materials science , pyrite , metallurgy , mass spectrometry , organic chemistry , chromatography
Total of 23 bench samples were taken from the No. 7 Coal of Iqe Coalfield, Qinghai Province, China, following Chinese Standard Method GB/T 482–2008 (2008). These samples were analyzed by powder X‐ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP‐MS) and X‐ray fluorescence (XRF). The results indicate that the No. 7 Coal belongs to a low rank ( R o,ran =0.659%) and high‐ash coal (40.54%). Compared to common Chinese and world low‐rank coals, the Iqe coal contains anomalous concentrations of rare metal elements, rare‐scattered (dispersed) elements and rare earth elements. The highest contents of Rb, Cs, Ga and REY reach to 180, 26, 37, and 397 ppm, respectively. Their average contents of these elements are 10.9, 15, 4.8 and 3.5 times higher than those of world coals, respectively. Minerals in the coal include kaolinite, quartz, muscovite, siderite, and traces of rutile, and brookite. Kaolinite could be main host minerals of Rb, Cs, Ga and REY. The anomalous rare element Rb and Cs accumulation in the Iqe coal is related to both organic and inorganic matter. The REY concentrations may be related to circulation of thermal solutions, contained or sorbed by clayey particles, and organic matter as well.