摘要
针对无底柱分段崩落法岩石混入率较高、矿石损失较大的问题,应用多分段多进路的相似模型,进行了不同放矿口高度和宽度条件下的放矿实验,从散体流动性的影响因素和散体压力平衡拱的形成与破坏的角度,分析了矿石回收率和岩石混入率的变化规律。结果表明:当同一分段的各进路同时出矿时,适当扩大放矿口宽度或者降低放矿口高度能够增加矿石移动带宽度,改善矿石流动性,提高矿石回收率,降低岩石混入率,而且每一个分段的矿石回收率也得到明显提升。
Aiming at the problems of high rock mixed rate and large ore loss in sublevel caving without sill pillar,the drawing experiments under different height and width of ore-drawing hole are carried out by using the similar model of multi-sublevel and multi-path.From the angle of influencing factors of granules fluidity and formation and destruction of granules pressure balance arch,the variation laws of ore recovery and rock mixed rate are analyzed.The results show that when all mining approach of the same sublevel are mined at the same time,properly enlarging the width or reducing the height of the ore-drawing hole could increase the ore moving bandwidth,improve the ore fluidity,increase the ore recovery and reduce the rock mixed rate,and the ore recovery rate of each sublevel is also significantly increased.
作者
张治强
杨建东
于志宏
马驰
ZHANG Zhiqiang;YANG Jiandong;YU Zhihong;MA Chi(School of Mining Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Engineering Research Center of Green Mining of Metal Mineral Resources Liaoning Province,Anshan 114051,China;JCHX Mining Management Co.,Ltd.,Beijing 101500,China)
出处
《中国矿业》
北大核心
2020年第11期107-111,共5页
China Mining Magazine
基金
“十二五”国家科技支撑计划课题项目资助(编号:2013BAB02B08)
辽宁省金属矿产资源绿色开采工程研究中心开放课题项目资助(编号:USTLKFGJ201604)。
关键词
散体流动性
放矿口尺寸
放矿效果
回收率
岩石混入率
granules liquidity
sizes of ore draw hole
ore drawing effect
recovery
rock mixed rate
