Anomalous Concentrations of Rare Metal Elements, Rare-scattered (Dispersed) Elements and Rare Earth Elements in the Coal from Iqe Coalfield, Qinghai Province, China
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This research was supported by the China geological survey project “Qaidam Basin Oil and Gas Resources Evaluation” (Nr: ([2013] 4 - (3), 001-008) and National Natural Science Foundation of China (No. 41330317).

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    Abstract:

    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 (Ro,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.

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SUN Yuzhuang, ZHAO Cunliang, LI Yanheng, WANG Jinxi.2015. Anomalous Concentrations of Rare Metal Elements, Rare-scattered (Dispersed) Elements and Rare Earth Elements in the Coal from Iqe Coalfield, Qinghai Province, China[J]. Acta Geologica Sinica(),89(1):229-241

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History
  • Received:October 18,2014
  • Revised:November 24,2014
  • Adopted:
  • Online: February 12,2015
  • Published: