分析煤炭飞灰中稀土元素的丰富,相关性和漏模式,并借助统计数据进行测量
Tongyao Ju1, Yuan Meng2, Siyu Han2
1CCCC Highway Consultants Co., Ltd, Beijing 100088, China; CCCC Green and Low Carbon Development Research Center, Beijing 100088, China.
The Science of the total environment
|August 9, 2023
概括
从煤炭飞灰 (CFA) 中提取稀土元素 (REEs) 是可行的. 脱水显著提高了REE回收,而酸性选择对经过处理和未经处理的灰的效率都有影响.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 煤炭飞灰 (CFA) 是一种主要的工业废物,含有有价值的稀土元素 (REEs).
- 从CFA中提取REEs提供了双重好处:废物利用和资源回收.
- CFA 的晶体结构阻碍了高效的 REE 提取,并且 REE 的相互关联/泄漏模式尚不清楚.
研究的目的:
- 通过脱来研究REEs在CFA中的丰富.
- 分析CFA中的REEs的相互关联和漏行为.
- 为了确定各种酸对CFA的REE提取的影响.
主要方法:
- 脱水过程以丰富CFA中的REEs.
- 使用多种酸 (HCl,HF,HNO3) 对REE漏模式的研究.
- 统计分析以量化脱和酸类型对REE提取的影响.
主要成果:
- 脱水增加了可浸的REEs,从137.37ppm增加到346.12ppm.
- 轻稀土元素 (LREEs) 的相互关联比重稀土元素 (HREEs) 弱.
- 脱水优先增强LREE水;酸性选择 (HCl/HF与HNO3/HF) 严重影响了未经处理的CFA和脱水的CFA的提取.
结论:
- 脱水是一种有效的预处理,可以增强CFA的REE回收.
- 了解REE的相互关联和特定酸的浸出对于优化提取至关重要.
- 这项研究为REE丰富和CFA加工中的酸选择提供了关键的见解.
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