铲入深度对无底柱分段崩落法放矿效果的影响

针对无底柱分段法采矿损失贫化大这一技术难题,采用大结构参数单漏斗放矿模型,研究了放矿过程中铲入深度对放出矿石量、矿石回收率及混岩率等指标的影响。结果表明:放矿端部正面废石会早于顶部废石侵入放矿过程;当铲入深度较小时,混岩率增加速率比较缓慢,放矿口会频繁出现结拱;随着铲入深度的增加,混岩率增加速率增大,且放矿口不易出现结拱;同时发现,放矿口矿岩的不均匀的流动是正面废石较早和大量侵入放矿过程的一个重要影响因素。

Effect of shoveling depth on ore drawing of non-pillar sublevel caving method

Aiming at the technical problem of large loss and dilution in non-pillar sublevel caving mining method, the effects of shoveling depth on the index of the amount of drawing out ore, the ore recovery ratio and rate of rock mixing researched via using a single funnel ore drawing model with big structure parameters. The results show the waste rock at the front face of the end of the ore drawing will invade the ore drawing process earlier than the top waste rock; when the shovel depth is small, the rate of rock mixing rate increases slowly and the hanging-up arch often occurs at the ore drawing hole; with the increasing of shovel depth, the increasing rate of rock mixing rate enlarges and it is difficult to form the hanging-up arch in the ore drawing hole. Meanwhile, it is discovered that the inhomogeneous flow of ore and rock at the drawing hole is an important factor induced the waste rock at the front face of the end of the ore drawing invade the ore drawing process earlier and massively.