对粉煤灰中稀土元素（REE）形态的全面理解及其对稀土可萃取性的影响,Environmental Science & Technology

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对粉煤灰中稀土元素（REE）形态的全面理解及其对稀土可萃取性的影响
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-04-09 , DOI: 10.1021/acs.est.9b00005
Pan Liu ₁ , Rixiang Huang ₁ , Yuanzhi Tang ₁

Affiliation

近年来，从粉煤灰（CFA）中回收稀土元素（REE）被认为是一种有前途的资源回收选择。然而，关于CFA中REE形态及其与REE可萃取性的相关性的定量信息尚未很好地建立。这项研究通过在微观到大尺度上采用多种分析和光谱技术，并结合热力学计算，系统地研究了四个代表性CFA样品中的REE形态-可萃取性关系。确定了一系列含REE的相，例如REE氧化物，REE磷酸盐，磷灰石，锆石和REE的玻璃相。REE可以离散颗粒的形式出现，也可以包裹在玻璃相中的颗粒出现，也可以分布在整个玻璃相中。尽管由于每种方法的固有局限性，通过X射线吸收光谱法和酸浸法量化的REE形态存在某些差异，但两种方法都显示出大量的REE氧化物，REE磷酸盐，磷灰石和含REE的铁氧化物。这项研究有助于深入了解CFA中的REE形态-分布-可萃取性关系，并有助于确定与REE形态定量相关的不确定性。它还为将来在复杂环境样品中进行稀土形态研究提供了一种通用方法，并为开发有效的稀土回收技术提供了知识基础。和含稀土的铁氧化物。这项研究有助于深入了解CFA中的REE形态-分布-可萃取性关系，并有助于确定与REE形态定量相关的不确定性。它还为将来在复杂环境样品中进行稀土形态研究提供了一种通用方法，并为开发有效的稀土回收技术提供了知识基础。和含稀土的铁氧化物。这项研究有助于深入了解CFA中的REE形态-分布-可萃取性关系，并有助于确定与REE形态定量相关的不确定性。它还为将来在复杂环境样品中进行稀土形态研究提供了一种通用方法，并为开发有效的稀土回收技术提供了知识基础。

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Comprehensive Understandings of Rare Earth Element (REE) Speciation in Coal Fly Ashes and Implication for REE Extractability

In recent years, recovery of rare earth elements (REEs) from coal fly ashes (CFAs) has been considered as a promising resource recovery option. Yet, quantitative information on REE speciation in CFAs and its correlation with REE extractability are not well established. This study systematically investigated the REE speciation-extractability relationship in four representative CFA samples by employing multiple analytical and spectroscopic techniques across the micro to bulk scale and in combination with thermodynamic calculations. A range of REE-bearing phases are identified, such as REE oxides, REE phosphates, apatite, zircon, and REE-bearing glass phase. REEs can occur as discrete particles, as particles encapsulated in the glass phase, or distribute throughout the glass phase. Although certain discrepancies exist on the REE speciation quantified by X-ray adsorption spectroscopy and acid leaching due to intrinsic limitations of each method, both approaches show significant fractions of REE oxides, REE phosphates, apatite, and REE-bearing Fe oxides. This study contributes to an in-depth understanding of the REE speciation–distribution–extractability relationship in CFAs and can help identify uncertainties associated with the quantification of REE speciation. It also provides a general methodology for future studies on REE speciation in complex environmental samples and a knowledge basis for the development of effective REE recovery techniques.

更新日期：2019-04-10

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