Differentiation of rare earth elements and yttrium in different size and density fractions of the Reshuihe coal, Yunnan Province, China
Differentiation of rare earth elements and yttrium in different size and density fractions of the Reshuihe coal, Yunnan Province, China
复制标题
中国云南省热水河煤不同粒度和密度组分中稀土元素和钇的分异
DOI：
10.1016/j.coal.2019.03.014
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发表时间：
2019-04-15
影响因子：
5.6
通讯作者：
Zhang, Wei
中科院分区：
文献类型：
--
作者：
Duan, Piaopiao;Wang, Wenfeng;Zhang, Wei
由于世界范围内对稀土元素和钇的需求不断增加，煤、粉煤灰以及选煤产品中的稀土元素和钇（REY）已引起人们的广泛关注。本文研究了热水河煤中稀土元素在不同粒级和密度组分中的分布、赋存状态及其对沉积物源区的指示意义。结果表明，物理分选法使轻稀土元素（LREY）富集在低密度和大粒径煤粒中，而中稀土元素（MREY）和重稀土元素（HREY）富集在小粒径和高密度煤粒中。此外，LREY与有机质的关系更为密切，而MREY和HREY则更多地出现在铝硅酸盐矿物中。热水河煤的物源主要来自峨眉山玄武岩序列顶部的长英质-中性岩。此外，进料煤中的REY通常不富集，尽管REY在1.4kg/L的密度级分中富集。密度为1.4kg/L的煤经重力分选后的燃烧产物具有潜在的经济价值，可作为稀土回收的原料。
Rare earth elements and yttrium (REY) in coal, fly ash as well as coal preparation products have attracted much attention due to the increasing demand worldwide. In this paper, the distribution of REY in different size and density fractions, their mode of occurrence, and the insight they provide on the sediment source region of the Reshuihe coal in southern China are studied. The results show that the physical separation method caused light-REY (LREY) to be enriched in the low-density and large-sized coal particles, whereas medium-REY (MREY) and heavy-REY (HREY) are enriched in small-sized and high-density fractions. In addition, LREY are more closely associated with organic matter, while MREY and HREY occur more often in aluminosilicate minerals. Moreover, the sediment source of the Reshuihe coal was mainly derived from the felsic-intermediate rocks at the top of the Emeishan basalt sequence. Further, REY in the feed coal are generally not enriched, though REY are enriched in density fractions of 1.4 kg/L. The combustion products of coal with a density of 1.4 kg/L obtained by gravity separation have a potential economic value as promising raw materials for REY.