Abstract
Stone coal is a special resource, because it is associated with a variety of rare metal elements. The elemental geochemical characteristics of stone coal can provide useful information for the study of its formation and evolution history. The content of rare earth elements in stone coal has been the focus of attention. Stone coal is widely distributed in southern Shaanxi province of China. In order to study the content and distribution of rare earth elements in stone coal, and provide a plan for the comprehensive development and utilization of stone coal, this study tested the rare earth elements content of stone coal, parting and coal ash samples, respectively, compared the content of rare earth elements in stone coal, parting, coal ash with the mean value of China coal, the mean value of world coal and the abundance value of upper crust, and discussed the features of rare earth elements content in different types of samples in southern Shaanxi province of China. The average contents of rare earth elements in the samples of stone coal, parting and coal ash were calculated, and the enrichment coefficients of the samples with the mean value of China coal, the mean value of world coal and the abundance value of upper crust were listed. The distribution rules and characteristics of the contents of rare earth elements in different types of samples in southern Shaanxi province of China were summarized.
Highlights
Stone coal is a kind of inferior sapropelite which is formed in ancient strata
The contents of rare earth elements in stone coal in southern Shaanxi is generally lower than the mean value of China coal and the abundance value of upper crust, which is close to the mean value of world coal, and it shows the characteristics of serious REEs loss and uneven distribution in general with large regional differences (Table 1)
The content of rare earth elements in stone coal is not high, which is generally lower than the mean value of China coal
Summary
Stone coal is a kind of inferior sapropelite which is formed in ancient strata. It has the characteristics of high ash, high sulfur, low carbon content, low calorific value, accompanying many kinds of metal elements and so on [1] [2] [3]. Luo et al have counted the selenium content in the lower Cambrian Lujiaping formation (41.0 μg/g), the Jianzhuba formation (18.5 μg/g) and the Lower Silurian Daguiping formation (14.0 μg/g) in the southern Qinling Mountains [9] [10] [14]. They consider that the hot magma of early Cambrian system volcanic. The study of rare earth elements in southern Shaanxi stone coal is relatively weak [21]. This study aims to explore the characteristics of rare earth elements in stone coal of southern Shaanxi, and provide a plan for the comprehensive utilization of stone coal
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