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Modes of Occurrence of Rare Earth Elements in Coal Fly Ash: A Case Study

机译：粉煤灰中稀土元素的赋存方式研究

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Coal fly ash (CFA), the main byproduct of coal combustion, has been regarded as an attractive source of rare earth elements plus yttrium (REY). Understanding how REY occurs in CFA is essential for designing an effective method for recovery of REY from CFA. To clarify the modes of occurrence of REY, we used particle size analysis, a sequential chemical extraction procedure (SCEP), and a scanning electron microscope with an energy dispersive spectrometer (SEM-EDS) to study REY in CFA from Guizhou Province, China. The relationship between the content of REY and particle size was consistent with previous results and implies that particle separation can be used to enrich the chemical extraction of REY from CFA. The results of the SCEP revealed the proportions of REY in different modes (silicate-aluminate organic or sulfide acid soluble metal oxides ion-exchangeable form) and can also be used as a guide for reagent choice in REY leaching and extraction. The results of the SEM-EDS analysis showed that REY in the CFA (La, Ce, and Nd as proxies) is significantly associated with Al and P. They also illustrated that Al has a more important role in REY occurrence than Si in aluminosilicates.
机译：煤燃烧的主要副产品粉煤灰（CFA）被认为是稀土元素和钇（REY）的诱人来源。了解CFA中REY的发生方式对于设计从CFA中回收REY的有效方法至关重要。为了阐明REY的发生方式，我们使用了粒度分析，顺序化学萃取程序（SCEP）和带能谱仪（SEM-EDS）的扫描电子显微镜对来自中国贵州省CFA的REY进行了研究。 REY含量与粒径之间的关系与先前的结果一致，并暗示可以使用颗粒分离来丰富从CFA中化学提取REY的过程。 SCEP的结果揭示了REY在不同模式下的比例（硅酸盐-铝酸盐>有机或硫化物>酸溶性>金属氧化物>离子可交换形式），也可作为REY浸出和萃取中试剂选择的指南。 SEM-EDS分析的结果表明，CFA中的REY（作为代理的La，Ce和Nd）与Al和P显着相关。他们还表明，在铝硅酸盐中，Al在REY发生中的作用比Si更重要。

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