无贫化放矿在金刚石矿山中的应用

Application of Non-dilution Ore-drawing Method in a Diamond Mine

在无底柱分段崩落法中,现行截止品位放矿没有考虑矿岩移动空间的连续性,不利于矿产资源的合理开发与利用.以某金刚石矿为研究背景,采用颗粒流法建立数值模型,对无贫化放矿和现行截止品位放矿2种放矿方式进行对比.试验结果表明:无贫化放矿在保持矿石总回收率基本不变的情况下,可大幅降低废石混入率,放矿效果最好;对于处于开采初期的矿山,在多个分段矿岩移动空间完备的情况下,采用无贫化放矿方式最为合理.

In the non-pillar sublevel caving method, the current cut-off grade ore-drawing method does not consider the continuity of the ore-rock movement space, which is unfavorable to the rational exploitation and utilization of mineral resources. In this paper, taking a diamond mine as the research background, the particle flow code PFC is utilized to establish a numerical model to compare the advantages and drawbacks of the two types of ore-drawing methods, i.e. non-dilution ore-drawing, and current cut-off grade ore-drawing. The test results show that, under the conditions of keeping the total recovery rate of the ores unchanged, non-dilution ore-drawing can greatly reduce the mixing rate of the waste rocks, showing the best ore-drawing effect. For the mine at the initial stage of mining, it is most reasonable to adopt the non-dilution ore-drawing method in case of the complete movement space of the ores in several sublevels.