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采选技术与矿山管理

基于改流体放矿技术的放矿口尺寸试验研究

  • 张淦 ,
  • 陶干强 ,
  • 吴宇轩
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  • 南华大学资源环境与安全工程学院,湖南 衡阳 421001
陶干强(1971-),男,湖南宁乡人,教授,博士生导师,从事采矿工艺和散体动力学方面的研究工作。

张淦(1994-),男,山西大同人,硕士研究生,从事金属矿山采矿工艺研究工作。

收稿日期: 2020-12-22

  修回日期: 2021-01-18

  网络出版日期: 2021-07-14

Experimental Study on the Ore-drawing Port Size Based on Inserts Ore Drawing Technique

  • Gan ZHANG ,
  • Ganqiang TAO ,
  • Yuxuan WU
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  • School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,Hunan,China

Received date: 2020-12-22

  Revised date: 2021-01-18

  Online published: 2021-07-14

本文亮点

针对无底柱分段崩落法开采中厚倾斜矿体普遍存在矿石损失贫化较高的问题,提出了改流体放矿技术。其基本原理是在回采进路矿岩接触处设立改流隔离板,以改变矿岩的流动路径并改善放矿条件。通过采用改流体放矿技术,开展了12组改流体放矿物理模拟试验,分析了改流体放矿技术中不同放矿口尺寸对矿石损失贫化的影响。试验结果表明:采用改流体放矿技术,适当调整放矿口尺寸可有效改善放矿效果;放矿过程中,增大放矿口宽度后,改流体结构能够有效改变废石原有的流动路径,防止矿石过早贫化;放矿口高度为3 m、宽度为6 m的方案放矿效果最佳,该方案下矿石回收率为73.61%。

本文引用格式

张淦 , 陶干强 , 吴宇轩 . 基于改流体放矿技术的放矿口尺寸试验研究[J]. 黄金科学技术, 2021 , 29(3) : 364 -371 . DOI: 10.11872/j.issn.1005-2518.2021.03.002

Highlights

Sublevel caving method without sill pillar is gradually applied to mining of inclined medium-thick ore bodies,for it has the advantages of simple craft,safety,high efficiency,high mechanization and low mining cost.Nevertheless,its high ore loss and high dilution in the mining of the inclined medium-thick orebody are still ubiquitous,so the inserts drawing technology was proposed.The basic principle of this technology is to insert steel pipes at the contact point of drift to form a diversion isolation plate (inserts) to change the flow path of the ore and the rock,and also to improve the conditions of drawing.By adopting inserts drawing technology,12 sets of physical simulation experiments of inserts drawing were carried out to analyze the influence of different sizes of drawing point on the ore loss and dilution of inserts drawing technology.The experimental results show that when the following drawing indexes are determined,such as the orebody inclination,orebody thickness,sublevel height and ore caving interval,and the inserts drawing technology is adopted,with the same height of the drawing point,the ore recovery rate increases with the augment of the width of the drawing point accordingly,and the dilution rate does not change significantly with the increase of the width of the drawing point.With the same width of the drawing point,the ore recovery decreases as the height of the drawing point increases,while the dilution rate increases with the increase of the height of the drawing point.Under the condition of the same dilution rate,compared with the conventional drawing,the recovery rate of inserts drawing is increased by 28.33%.In the process of drawing,the width of drawing point is increased,and the inserts structure can effectively change the original flow path of the waste rock,delay the flow rate of the waste rock,and prevent the waste rock from being prematurely depleted.The drawing scheme with a height of 3 m and a width of 6 m has the best drawing effect,and the ore recovery rate is 73.61%.

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脚注

http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-3-364.shtml

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