黄金科学技术 ›› 2021, Vol. 29 ›› Issue (2): 256-265.doi: 10.11872/j.issn.1005-2518.2021.02.208
• 采选技术与矿山管理 • 上一篇
摘要:
为解决某矿山细尾砂充填体流动性差、强度低的问题,通过正交试验和胶结充填试验,探究尾砂料浆浓度、胶凝材料掺量、外加剂掺量和细尾砂掺加比例对充填体强度的影响,得出了各因素影响充填体强度的重要性顺序。通过多元回归分析确定推荐配比参数,并结合试验结果和SEM分析,对充填体微观结构进行进一步的探究。结果表明:各因素影响充填体强度的重要性顺序依次为胶凝材料掺量、料浆浓度、外加剂掺量和细尾砂掺加比例。通过控制变量,可得充填体强度的增长规律,即增大料浆浓度和胶凝材料掺量,均可提高充填体强度;在合适的掺量范围内,充填体强度随外加剂掺量的增加而提高;细尾砂掺量对充填体强度产生较复杂的影响。实际矿房充填推荐配比参数如下:料浆浓度为70%,胶凝材料掺量为20%,外加剂(减水剂)掺量为1‰,细尾砂掺量为30%。掺加外加剂可使充填体水化反应更充分,有助于提高其强度。研究表明,细尾砂充填体强度和流动性可以满足矿山实际矿房充填的要求。
中图分类号:
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