危险元素的漏行为在不同的漏过程中使用了基于渣飞灰的剂:,和
Jia Li1, Guoxiang Teng2, Siqi Zhang1
1School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.
The Science of the total environment
|February 11, 2024
概括
这项研究使用高炉渣 (BFS) 和城市固体废物焚烧 (MSWI) 飞灰开发了低碳水泥材料,大大减少了二氧化碳排放. 这项研究确保了重金属的漏仍然低于标准,从而使建筑垃圾的安全利用成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 建筑化学 建筑化学
背景情况:
- 高炉渣 (BFS) 和城市固体废物焚烧 (MSWI) 飞灰对于低碳水泥材料 (BFCM) 至关重要,通过取代水泥来减少二氧化碳排放.
- 在活性化水泥材料中MSWI飞灰的应用带来了重金属漏风险,阻碍了广泛使用.
- 控制重金属漏对于可持续利用建筑中的工业和城市废物至关重要.
研究的目的:
- 评估MSWI飞中的高风险元素 (Cr,Sb,Pb) 在BFS飞基水泥材料 (BFCM) 中的浸出行为.
- 为了评估不同漏方法在重金属流动性表征方面的有效性.
- 调查BFCM的长期稳定性和安全性,其中包括MSWI飞灰.
主要方法:
- 采用了三种静态漏方法 (水平振动,硫酸和酸,酸缓冲溶液) 和酸中和能力 (ANC) 测试.
- 用特定矩阵 (A4:BFS:MSWI飞灰:FGDG = 70:20:10) 制备和测试了基于BFS飞灰的水泥材料 (BFCM).
- 视觉MINTEQ模拟用于预测BFCM系统内的重金属的发生状态.
主要成果:
- A4矩阵在180天内达到72.51 MPa的压力强度,在化学攻击下,Cr,Sb和Pb的浸出度低于标准限值.
- 从ANC测试中确定的临界pH值为9.2,表明稳定性在这个范围内.
- "双盐效应"提高了BFS解离的38.71%,促进了稳定的乙矿的形成 (29%在180天),并控制了长期的漏.
结论:
- 开发的BFCM (A4矩阵) 有效地固定了MSWI飞中的重金属,满足了建筑应用的安全标准.
- "双盐效应"和埃特灵石的形成是确保长期稳定性和减轻泄漏风险的关键机制.
- 这项研究为从工业和城市废物中获得的低碳BFCM的安全和广泛使用提供了关键数据.
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