【摘要】 特大型低品位铁矿全尾砂充填开采关键是采充能力匹配、浓度稳定及成本控制，提高效率使吨矿充填作业成本下降，单套充填系统制备输送能力应达200～220 m~3/h,保证瞬态和持续大流量供砂能力。供砂浓度决定充填料浆质量浓度，单套制备系统配备2座容积为2020 m~3的大容积砂仓，通过高效仓储造浆放砂实现结构流高浓度充填，充填料浆质量浓度稳定在72%左右，单套系统单次充填量在4000 m~3以上，并通过循环使用具备24 h连续充填能力，实现强采强充，保证矿山采充平衡。采用P·C 32.5水泥为胶凝材料的充填体强度虽能达到井下空区设计强度要求，但采用新型胶凝材料作为胶结剂能大幅降低充填配比和平均用量，每立方米实体减少的胶结剂充填成本为20.01元，结合矿山年处理空区体积要求，采用新型胶凝材料时充填成本将节省约4468万元/a。更多还原

【Abstract】 The key to the whole tailings filling mining of large lean iron ore mines is the matching degree of mining and filling capacity, concentration stability and cost control. To reduce filling costs, it is crucial to improve efficiency and reduce the cost of filling operations per ton of ore. The proposed solution introduced a filling preparation system with a capacity of 200-220 m~3/h, capable of delivering slurry at both transient and sustained high flow rates. Moreover, the concentration of sand supply determines the mass concentration of filling slurry. The system was equipped with two large-volume sand silos, each with a volume of 2020 m~3, enabling efficient storage, slurry preparation, and discharge to realize high concentration filling of structural flow. The mass concentration of filling slurry was maintained at about 72%. The single system can filling over 4000 m~3 in a single operation and sustain continuous filling for 24 hours through recycling, so as to realize strong mining and strong filling and maintain a balance between mining and filling in mine. Furthermore, although the strength of the filling body using P·C 32.5 as cement cementitious material can meet the design strength requirements of the underground goaf, the use of new cementitious material as a cementing agent can greatly reduce the filling ratio and average dosage. This reduction translates to a cost savings of RMB20.01 per cubic meter of structure. Considering the annual volume requirements for goaf filling in the mine, adopting this new cementitious material has the potential to yield substantial savings of around RMB44.68 million per year in filling expenses.更多还原