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首页> 外文期刊>Solid Fuel Chemistry >Modes of Occurrence of Rare-Earth Elements (La, Ce, Sm, Eu, Tb, Yb, Lu) in Coals of Northern Asia (Review)
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Modes of Occurrence of Rare-Earth Elements (La, Ce, Sm, Eu, Tb, Yb, Lu) in Coals of Northern Asia (Review)

机译：北亚煤炭煤炭稀土元素（LA，CE，SM，欧盟，TB，YB，LU）的发生模式（审查）

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摘要

The modes of occurrence of six rare-earth elements (La, Ce, Sm, Eu, Yb, and Lu) in low-rank coals (lignites and sub-bituminous coals; also referred to as brown coals) from different deposits of Siberia, the Russian Far East, Kazakhstan, and Mongolia were studied using two selective leaching methods. Selective extraction of organic compounds included the extraction of organic substances with minimal effects on the mineral matter was only used for low-rank coals. The second method of the selective leaching of rare-earth elements (REE) from mineral matter in brown and bituminous coals used ammonium acetate, conc. HCl, conc. HF and 10% HNO3. The content of the six rare-earth elements in all phases (bitumen, humic acids, and residues) was determined by INAA. It was found that in the early stages of coal formation the bulk of the REE was associated with the organic matter primarily humic substances. Release of REE from humic substances during coalification results in the formation of authigenic minerals. The proportion of the REE in organic forms is gradually reduced in the coalification process until there is a complete REE transition to mineral phases in anthracite and graphite. These investigations showed that the alteration of modes of occurrence of La, Ce, Sm, Eu, Yb, and Lu from primary organic compounds to primary minerals occurred simultaneously with the organic matter alteration over the coalification process from peat to anthracite.
机译：低碱煤（Lignite和亚沥青煤中的六种稀土元素（La，Ce，Sm，欧盟，Yb和Lu）的发生模式来自西伯利亚的不同沉积物，使用两种选择性浸出方法研究了俄罗斯远东，哈萨克斯坦和蒙古。有机化合物的选择性提取包括对矿物质的最小效果的有机物质的提取仅用于低碱基。从棕色和沥青煤中的矿物质中选择性浸出稀土元素（REE）的第二种方法使用乙酸铵，浓度。 HCL，CONC。 HF和10％HNO3。通过INAA测定所有阶段（沥青，腐殖酸和残基）中六个稀土元素的含量。发现，在煤炭的早期阶段，大部分重量主要是腐殖质的有机物质。在聚会期间从腐殖质中释放REE，导致构建矿物质的形成。聚结液过程中，在有机形式中的比例逐渐减少，直至有无烟煤和石墨中的矿物相的完全重新过渡。这些研究表明，从泥炭到无烟煤上的聚结液过程中，从初级有机化合物到初级有机化合物中，从初级有机化合物到原代有机化合物发生的发生模式。

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