典型的重金属在煤炭气化渣中的分布,发生和透性
Yifan Zhang1, Jiangshan Qu2, Jianbo Zhang3
1State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources, Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China; CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China.
The Science of the total environment
|April 1, 2024
概括
煤气化废渣 (CGS) 由于重金属的漏,造成环境风险. 细 (CGFS) 比粗 (CGCS) 显示出更高的移动重金属,因此在使用CGS之前需要仔细评估.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 煤气化废渣 (CGS) 是一种含有潜在有害重金属的副产品.
- 了解重金属漏对于安全的CGS管理和利用至关重要.
- CGS属性的变化,如颗粒大小 (粗与细),可能会影响金属的移动性.
研究的目的:
- 调查矿物成分,元素分布和重金属在煤气化粗渣 (CGCS) 和细渣 (CGFS) 中的存在情况.
- 阐明CGS中重金属的漂水特性和与重金属相关的环境风险.
- 为评估CGS的资源利用潜力提供数据.
主要方法:
- 在CGCS和CGFS中分析矿物成分和元素分布.
- 评估重金属的发生和流动性.
- 在各种pH条件下使用漏环境评估框架 (LEAF) 1313进行漏试验.
- 炼重金属度与地下水标准的比较.
主要成果:
- 细型CGS (CGFS) 与粗型CGS (CGCS) 相比,具有显著更高的移动重金属含量 (0.06%63.03%) (0%18.72%).
- 重金属 (Zn,Cr,Cd,As,Pb,Ni,Cu) 在低pH下表现出高漏率;在pH2下,Zn达到2.11mg/L.
- Zn,Cr和As表现出两极性漏行为,高pH (1.34 mg/L) 时As的漏率高于低pH (1.31 mg/L) 时.
- 在CGS中的大多数重金属在某些条件下超过了III类地下水标准,不包括Cu.
结论:
- 压缩金属,特别是CGFS,存在重金属入环境的重大风险.
- 重金属的浸行为强烈依赖pH值,对于Zn,Cr和As具有显著的两特性.
- 由于地下水可能被炼的重金属污染,CGS的资源利用需要进行彻底的环境风险评估.
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