使用性添加剂用于填充,提高硫化物丰富尾矿的性能
Zhenqi Wang1, Aixiang Wu2, Shaoyong Wang1
1Key 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; School of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Environmental research
|June 20, 2025
概括
将氧化 (CaO) 添加到含硫量高的尾矿中,可显著提高水泥糊填充的强度和稳定性,解决地下处理这些危险材料的关键挑战.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 高硫尾矿由于强度差和矿物质成分差,造成了独特的处置挑战.
- 传统的倒装方法与富含硫化物尾矿作斗争,影响安全和环境标准.
研究的目的:
- 调查添加剂在提高硫化物丰富尾矿回填性能方面的有效性.
- 为了解决由高硫尾矿制成的水泥回填充 (SCPB) 的低最佳强度和稳定性.
主要方法:
- 进行了风湿学,机械和显微镜分析.
- 漏试验和成本效益评估评估了添加剂的性能.
- 特别研究了氧化 (CaO) 对SCPB特性的影响.
主要成果:
- 氧化 (CaO) 的添加显著提高了无限制压力 (UCS) 的280%至1.82MPa,达到采矿安全门.
- 添加CaO可以减少78%的有害毛孔,并促进基本水化产品 (CH和C-S-H) 的形成.
- 用CaO修改后填充实现了重金属的高固定率:Zn2+ (98.6%),Pb2+ (93.2%),Cu2+ (89.1%) 和Fe3+ (85.4%).
结论:
- 氧化 (CaO) 是一种高效的添加剂,可提高硫化物丰富的水泥糊补充剂 (SCPB) 的强度和稳定性.
- 添加CaO减轻了不良pH值和石膏形成引起的强度降解,增强了水化产品的发展.
- 该研究证实了CaO适用于安全,环保和高效地下处置硫化物丰富的尾矿的适用性.
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