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金属矿山 ›› 2019, Vol. 48 ›› Issue (08): 27-31.

• 采矿工程 • 上一篇    下一篇

放矿口尺寸对放矿效果的影响

于志宏1,张治强1,2,宋超1,马驰1   

  1. 1. 辽宁科技大学矿业工程学院,辽宁 鞍山 114051;2. 辽宁省金属矿产资源高效综合利用工程技术研究中心,辽宁 鞍山 114051
  • 出版日期:2019-08-15 发布日期:2019-10-10

Influence of Ore Chute Sizes on Ore Drawing Effect

Yu Zhihong1,Zhang Zhiqiang1,2,Song Chao1,Ma Chi1   

  1. 1. School of Mining Engineering ,University of Science and Technology Liaoning,Anshan 114051,China;2. Engineering and Technology Research Center of High-efficiency Mining-processing and Utilization of Metal Mineral Resources of Liaoning Provence,Anshan 114051,China
  • Online:2019-08-15 Published:2019-10-10

摘要: 无底柱分段崩落法是金属矿山地下开采应用较多的一种高效采矿方法,在覆盖岩层下进行放矿,矿石损失贫化大、回收效果差的问题非常突出。为了解决这一问题,国内外的大量研究集中在放矿理论、结构参数、覆盖层形成和出矿工艺等方面。无底柱分段崩落法放矿中,放矿口尺寸的大小对放矿效果有着显著的影响,是造成无底柱分段崩落法损失贫化大的一个不可忽视的因素。为了进一步研究放矿口高度和宽度对放出矿石量、废石混入的影响,采用单进路单分段 物理放矿模型,进行了12种不同放矿口尺寸的物理放矿实验。结果表明:适当扩大放矿口宽度或降低高度,会增加放出纯矿石量、提高矿石回收率、降低贫化率,且放矿口宽度小于5 m,高宽之比在0.7~1之间时,混入废石率较小。

关键词: 无底柱分段崩落法, 放矿口尺寸, 放矿效果, 回收率, 贫化率

Abstract: Sublevel caving method without pillar is a high efficient mining method which is widely used in underground mining of metal mines. Such problems as high ore loss and dilution, poor recovery effect are usually appeared during ore drawing under the overburden. In order to solve these problems, a great deal of researches have focused on the theory of ore drawing, the structural parameters, the formation of overburden and the technology of ore drawing. In sublevel caving without pillar, the size of ore chute has a significant effect on ore-drawing effect and it is an important factor that causes high loss and dilution under sublevel caving without pillar. In order to further study the effect of the height and width of the ore chute on the ore yield and the reverberation of waste rock, physical ore-drawing experiments with 12 different ore chute sizes were carried out by single-pass single-stage physical ore-drawing model.The results show that adequately increasing the width of ore drawing hole or lowering the height will increase the amount of pure ore, improve the recovery rate of ore and reduce the dilution rate. When the width of ore chute is less than 5m, and its height-width ratio is ranging from 0.7 to 1, the waste in-ore rate is lower.

Key words: Pillarless sublevel caving method, Sizes of ore chute, Ore drawing effect, Recovery, Depletion