规格和分区:对煤炭飞灰中的稀土元素 (REEs) 的调查研究
Estefania Garcia1, Yinghao Wen1, Pan Liu1
1School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, USA. yuanzhi.tang@eas.gatech.edu.
Environmental science. Processes & impacts
|February 17, 2026
概括
这项研究使用X射线吸收光谱学在煤炭飞灰中特征稀土元素 (REE) 变异. 调查结果显示,REE主要以剩余分数形式存在,这对于开发国内REE资源至关重要.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
背景情况:
- 稀土元素对于半导体和人工智能等先进技术至关重要.
- 美国面临对 REE 的进口依赖,需要国内原料开发.
- 煤灰 (CFAs) 是可再生能源的潜在国内来源.
研究的目的:
- 描述 (Y) 的化学物种化作为CFA中的REE探针.
- 了解在CFA颗粒中的散装和微量级的REE分布和同定位.
- 评估用于资源回收的CFA的不同分数中REE的存在.
主要方法:
- 同步射线X射线吸收光谱 (XAS) 用于批量和微量分析.
- 大量X射线吸收靠近边缘结构 (XANES) 来确定整体物种.
- 微型X射线光显微镜 (μ-XRF) 和微型XANES用于分析粒子级别的物种化.
- 序列化学提取以量化不同阶段的REEs.
主要成果:
- 大量XANES表示Y物种化主要以Y氧化物为主,并纳入酸盐,氧化铁和玻璃相.
- 微XRF和微XANES在单个CFA粒子中揭示了异构的Y物种化和与其他REEs的同定位.
- 序列提取显示REEs主要以残留分数 (玻璃,酸,氧化铁) 和可降解分数 (碳酸盐,氧化铁) 为主.
结论:
- 在CFA中的REEs主要与稳定的矿物阶段有关,这表明直接开采的挑战.
- 在CFA粒子中的异质物种化需要先进的表征技术.
- 需要进一步的分析方法来准确评估可从CFA中提取REE的资源回收能力.
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