长期性能:强度和金属封装在活性铁矿石尾矿中
William Mateus Kubiaki Levandoski1, Suéllen Tonatto Ferrazzo2, Maria Alice Piovesan3
1Graduate Program in Environmental Science and Technology, Universidade Federal da Fronteira Sul, Erechim, RS, 99700-970, Brazil.
概括
这项研究稳定了铁矿石尾矿 (IOT),使用来自甘的包灰和蛋石灰的活性粘合剂 (AAB). 稳定材料没有金属毒性和良好的强度,使其适合应用.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 地质技术工程 地质技术工程
背景情况:
- 采矿尾矿需要有效的稳定,以便安全重复使用.
- 活性粘合剂 (AAB) 为传统水泥提供了一个可持续的替代品.
- 了解长期性能是材料应用可行性的关键.
研究的目的:
- 为了评估铁矿石尾矿 (IOT) 的稳定和固化,使用从甘包灰和蛋石灰中提取的AAB.
- 为了评估稳定IOT随着时间的推移 (7至365天) 的强度发展和浸出特性.
- 为了研究材料的行为和化学/矿物质变化,当暴露在酸性环境.
主要方法:
- 不受限制的压缩强度 (UCS) 测试.
- 泄漏试验. 泄漏试验. 泄漏试验. 泄漏试验. 泄漏试验. 泄漏试验. 泄漏试验.
- 射线衍射 (XRD) 和富里埃变换红外光谱法 (FTIR).
主要成果:
- 在7至60天之间,UCS显著增加,达到6.47 MPa,随后的变化很小.
- 随着时间的推移,在活性结合剂 (AAB) 结合的IOT中没有观察到金属毒性.
- 在90天内实现了Ba,Mn,Pb和Zn的完全封装.
- 证实了N-A-S-H凝的形成,矿物质在水后保持稳定.
- 酸性暴露改变了碳酸盐键,但没有改变整体N-A-S-H凝结构.
结论:
- 活性粘合剂 (AAB) 有效地稳定铁矿石尾矿 (IOT),提供良好的机械强度和长期耐用性.
- 稳定材料表现出优异的金属封装,防止环境毒性.
- N-A-S-H凝基质是坚固的,对浸出和酸性条件具有抗性,这表明它适用于各种应用.
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