研究矿加工残留固化产品的环境稳定性能
Ming Xia1,2,3, Pengyue Su1, Hao Wang1
1School of Environmental and Chemical Engineering, Jiangsu Ocean University Lianyungang 222005 China xiaming@jou.edu.cn.
RSC advances
|January 4, 2024
概括
亚酸和高炉渣有效地固化了危险的矿加工残留物 (COPR). 固化COPR在结解周期下表现出极好的稳定性,但高温降低了它的强度.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
背景情况:
- 矿加工残留物 (COPR) 由于可浸的六价 (Cr(VI)) 构成环境风险.
- 酸 (AA) 和高炉渣 (BFS) 用于排毒和固化危险的COPR.
研究的目的:
- 评估固化COPR在高温和冷解条件下的环境稳定性.
- 评估AA和BFS在稳定COPR对环境压力因素的有效性.
主要方法:
- 固化COPR样本 (40%的COPR) 经过高温 (900°C2小时) 和冷解循环处理.
- 通过测量边缘长度,质量损失,压力强度和Cr (VI) 漏的变化来分析稳定性.
- 用X射线衍射 (XRD) 和富里埃变换红外光谱法 (FTIR) 进行结构分析.
主要成果:
- 高温显著降低了固化COPR的压力强度,至最低为35.76MPa.
- 冷解周期的影响最小,保持压力强度高于80MPa.
- 在冷解条件下,六价的泄露仍然低于5毫克L-1的监管限值.
- XRD和FTIR证实了COPR的有效物理和化学固化.
结论:
- 使用AA和BFS固化COPR在结解周期下表现出强大的稳定性,Cr (VI) 漏最小.
- 高温对固化COPR的分子结构和机械性能产生负面影响.
- AA和BFS的组合为COPR的环境修复提供了一种有效的方法,特别是在对抗冷解的降解方面.
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