关于水泥固化脱硫残留物的性能和机制的研究
Shicheng Wang1, Fang Wang1, Jialing Che1
1School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China.
Materials (Basel, Switzerland)
|June 10, 2023
概括
工业脱硫残留物 (DMR) 可以使用普通波特兰水泥进行安全处理. 优化水泥含量和颗粒大小可以提高强度,有效固化,防止重金属污染.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 固体废物管理 固体废物管理
背景情况:
- 脱硫残留物 (DMR) 是电解残留物 (EMR) 处理的有问题的工业固体废物.
- 黄金回收带来了土地占用和土壤和水资源中重金属污染的风险.
- 有效和安全的处理方法对于DMR的资源利用至关重要.
研究的目的:
- 调查使用普通波特兰水泥 (PO 42.5) 作为固化剂对DMR的无害治疗.
- 评估水泥含量和DMR颗粒大小对硬化材料的机械性能和浸出毒性的影响.
- 为了阐明DMR在水泥基质中的固化机制.
主要方法:
- 使用普通波特兰水泥固化DMR,其水泥含量和DMR颗粒大小各不相同.
- 评估固化物体的屈曲强度,压力强度和浸出毒性.
- 使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和能量分散X射线光谱 (EDS) 分析相位组成和显微镜形态.
主要成果:
- 增加水泥含量和使用80网格的DMR颗粒大小显著改善了曲和压力强度.
- DMR颗粒大小极大地影响了强度;4网状颗粒导致应力度和强度降低.
- 10%的水泥含量实现了 (Mn) 的99.8%的固化率,化度为2.8 mg/L.
结论:
- 普通的波特兰水泥有效地固化DMR,增强机械强度和固定重金属,如.
- 优化水泥含量和精细的DMR颗粒大小是实现优越固体性能的关键.
- 固化机制涉及到乙酸 (AFt) 和MnO2的形成,Mn通过同态替代将Mn纳入C-S-H凝.
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