Geochemical Evaluation of Enrichment of Rare-Earth and Critical Elements in Coal Wastes from Jurassic and Permo-Carboniferous Coals in Ordos Basin, China
Geochemical Evaluation of Enrichment of Rare-Earth and Critical Elements in Coal Wastes from Jurassic and Permo-Carboniferous Coals in Ordos Basin, China
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DOI：
10.1007/s11053-019-09555-9
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发表时间：
2020-06-01
影响因子：
5.4
通讯作者：
Luo, Kunli
中科院分区：
文献类型：
--
作者：
Hussain, Rahib;Luo, Kunli
煤矸石是一种潜在的稀土元素（REEs）和一些经济上关键元素回收的来源。本文报道了陕西韩城石炭二叠纪（渭北煤田）和宾县侏罗纪（黄龙煤田）煤中稀土元素和临界元素的丰度和富集特征。宾县煤明显富集稀土元素。韩城煤与世界煤、美国煤相比，富Y、Ce、Sc、La、Yb、Nd、Pr、Gd、Er、Sm、Dy，贫Lu、Eu、Ho、Tb、Tm。宾县原煤中稀土元素含量分别为Sc13.8，Y13.1，La27.8，Ce48.49，Sm4.1，Nd 22，Eu0.8，Gd3.8，Pr5.43，Dy2.5，Er1.4，Yb1.3mg/kg。韩城原煤中稀土元素含量（mg kg-1）为Sc 8.8，Y 18.6，La 34.8，Ce 60.2，Nd 26，Yb 1.8，Eu 01，Pr 6.71，Sm 5.3，Dy 3.4，Tb 0.66，Er 1.9，Gd 5.16。宾县原煤中关键元素的含量（mg kg（-1））为Cr 30.8、Pb 41.5、Ni 49.7、Cu 35.7、Ba 257.9、V 51.7、Zn 63.1、Li 135、Ga 20.6、U 2.9、Th 10.2、As 12.7、Al 98，887、Fe 23，916和Ti 4289。韩城煤中临界元素含量（mg kg-1）为：Cr 384，Pb 56.1，Ni 93.9，Cu 49.5，Ba 371，V 90.7，Zn 7653，Li 183，Ga 35.9，U 4.9，Th 17.7，As 10.1，Al 108，344，Fe 20，433，Ti 2873。宾县煤和韩城煤中稀土元素的含量均不高，但某些临界元素含量较高。Al 2 O3/TiO 2比值表明鄂尔多斯盆地沉积物来源于中长英质岩石，但变化不大（r = 0.98）。几乎所有样品的Eu、Gd均呈现正异常，Ce均呈现负异常。Gd的正异常反映了可能有Ba干扰的热液侵入宾县煤。宾县煤的高挥发分反映了烟煤到无烟煤的变化，而韩城煤的低挥发分反映了泥炭到褐煤的变化。从这些煤中回收作为副产品的稀土和关键元素不仅可以增加收入，而且还将导致环境质量的改善。
Coal waste is a potential source of rare-earth elements (REEs) and some economically critical elements recovery. The present study reports the abundance and enrichment of REEs and critical elements in the Hancheng Permo-Carboniferous (Weibei coalfield) and Binxian Jurassic coals (Huanglong coalfield) of Shaanxi, China. The Binxian coal is distinctly enriched in all REEs. The Hancheng coal is enriched in Y, Ce, Sc, La, Yb, Nd, Pr, Gd, Er, Sm and Dy and depleted in Lu, Eu, Ho, Tb and Tm, compared with that of the average earth's crust abundance (ECA), world coal and the US coal. In the Binxian raw coal, the REEs contents, namely Sc 13.8, Y 13.1, La 27.8, Ce 48.49, Sm 4.1, Nd 22, Eu 0.8, Gd 3.8, Pr 5.43, Dy 2.5, Er 1.4 and Yb 1.3 in mg kg(-1). The contents (mg kg(-1)) of REEs in the Hancheng raw coal were Sc 8.8, Y 18.6, La 34.8, Ce 60.2, Nd 26, Yb 1.8, Eu 01, Pr 6.71, Sm 5.3, Dy 3.4, Tb 0.66, Er 1.9 and Gd 5.16. The contents (mg kg(-1)) of critical elements in the Binxian raw coal were Cr 30.8, Pb 41.5, Ni 49.7, Cu 35.7, Ba 257.9, V 51.7, Zn 63.1, Li 135, Ga 20.6, U 2.9, Th 10.2 As 12.7, Al 98,887, Fe 23,916 and Ti 4289. The contents (mg kg(-1)) of critical elements in the Hancheng coal were Cr 384, Pb 56.1, Ni 93.9, Cu 49.5, Ba 371, V 90.7, Zn 7653, Li 183, Ga 35.9, U 4.9, Th 17.7, As 10.1, Al 108,344, Fe 20,433 and Ti 2873. The contents of REEs in the Binxian and Hancheng coals were not in a promising range, whereas some of the critical elements were highly abundant. The Al2O3/TiO2 ratio indicated that the Ordos Basin sediment was derived from intermediate-felsic rocks with a slight variation (r = 0.98). The Eu and Gd show positive anomalies with negative Ce anomalies almost in all the samples. The positive anomalies of Gd represent the intrusion of hydrothermal fluid with possibly Ba interference in the Binxian coal. The high volatile matter in the Binxian coal reflects bituminous to anthracite coal, whereas the low volatility of the Hancheng coal reflects peat to lignite coal. The recovery of the REEs and critical elements as a by-product from these coals may not only increase the revenue but will also lead to an improvement in the environmental quality.