硫化物丰富和脱硫尾矿的环境处置:加厚,质,机械和浸性能
Zhenqi Wang1, Chong Chen1, Aixiang Wu1
1School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; Key Laboratory of Safe and Green Mining of Metal Mines with Cemented Paste Backfill, National Mine Safety Administration, University of Science and Technology Beijing, Beijing 100083, China.
The Science of the total environment
|November 2, 2024
概括
从富含硫化物尾矿中制备水泥回填充 (CPB) 提供了环保的处置. 最佳的花和削提高了CPB的性能,由于优越的强度和较低的环境影响,S20.7尾矿被推用于回填.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 矿物加工 矿物加工
背景情况:
- 表面处置富含硫化物尾矿导致环境和地下水污染.
- 混凝土回填充 (CPB) 是一种环保的替代方式,用于地下垃圾处理.
- 对于CPB的硫化物丰富尾矿的加厚和机械性能尚不清楚.
研究的目的:
- 为了研究硫化物丰富和脱硫的尾矿对CPB的加厚性能.
- 为了确定最佳的花条件和削对CPB属性的影响.
- 评估从不同硫化物含量的废弃物中制备的CPB的机械强度和环境影响.
主要方法:
- 沉柱实验以确定最佳的浮剂条件和度,初始沉率 (ISR) 和尾矿度之间的关系.
- 动态加厚实验利用削切割来评估度和切割产量应力演变.
- 机械试验 (不限压力) 和泄试验,用于不同硫化物含量的CPB样品 (S20.7和S30.7).
主要成果:
- 度和ISR显示与尾巴养度的线性关系.
- 较高的硫化物含量与较高的度相关,原因是比重增加.
- 雷克剪切显著改善了度和剪切产量应力,它们之间建立了对数模型.
- 与S30.7尾矿相比,来自S20.7尾矿的CPB表现出更高的不受限制的压力和更低的环境影响.
结论:
- 最佳的 flokulant 条件和 rake-shearing 参数增强了 CPB 富硫化物尾矿的加厚和机械性能.
- 脱硫至20.7%S (S20.7) 的尾矿适合回填,满足强度要求,降低环境风险.
- 这项研究提供了关于硫化物丰富尾矿的性能,以实现可持续的填充和环境保护的关键见解.
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