基于活性材料的全尾砂胶结充填技术

Cemented backfilling technology with unclassified tailings based on active materials

为解决尾砂地表堆积危害,全尾砂充填细泥含量多、水泥离析严重及NPA药剂絮凝成团所造成的全尾砂胶结充填采场脱水难、固结体强度偏低、水泥单耗大、充填成本较高等难题,将粉煤灰和炉渣(活性材料)应用于全尾砂胶结充填,研究了其物化性能、胶结作用机理、优化配比及全尾砂胶结充填系统。结果表明,粉煤灰、水淬炉渣胶凝活性明显,大大减少水泥离析,提高充填强度;推荐水泥:活性材料:全尾砂配比为1:2:8充填料充填,1:2:6的充填料胶面,质量浓度均为70%;充填材料胶结过程包括水化期、水硬期和强度期;设计的全尾砂胶结充填系统简便、灵活,采场充填效果理想,尾砂利用率达100%。

The physical and chemical characteristics,cemented backfilling mechanism,optimized proportions and cemented backfilling system of active materials（fly ash and water residue） and unclassified tailings were studied to deal with the serious problems of tailing piles,dehydrating hardly,low strength,high Portland cement consumption,high backfilling cost and so on caused by the excessive fine articles of unclassified tailings,isolation of Portland cement and side influences of NPA flocculation function.The results show that fly ash and water residue can reduce the isolation of Portland cement,advancing cemented strength with good coagulation action.The recommendation mass ratios are l：2：8（cement：active material：unclassified tailings） to backfill ordinarily and 1：2：6 to backfill the surface of ordinary body,with 70%of mass fraction of solid.Cemented process involves hydration stage,solidifying stage and strength stage. Meanwhile,the design system is simple and flexible,with good backfilling effect and 100%of unclassified tailings utilization ratio.