分段卸压崩落法导流放矿实验研究

分段卸压崩落法是近年提出的开采矿岩不稳固倾斜中厚矿体的有效方法,但也存在矿石损失贫化较大的缺点.针对这一问题,从倾斜中厚矿体的散体流动特性出发,分析了矿石损失贫化大的原因,提出了导流放矿技术措施.通过物理模拟实验综合考察了进路位置对损失率和贫化率的影响;研究了导流放矿的效果,并与非导流放矿的实验结果进行了对比.结果表明,导流放矿技术措施能够明显改善矿石损失贫化指标,尤其对提高下盘矿石残留体的回收效果更为显著.实验给出了卸压与导流参数的取值范围.

Experimental Study on Diversion Drawing by Stress-Relieve Sublevel Caving Method

Stress-relieve sublevel caving is an effective method developed recent years to solve the problems caused by mining unstable and inclined medium-thick orebody,but it has disadvantages of high ore loss and dilution.To solve the problem,the reason for the high loss and dilution is analyzed in the light of the flowing characteristics of ore-rock granular in inclined medium-thick orebody.The diversion drawing technique is then proposed.The influence of the position of a draft on the loss and dilution was investigated comprehensively through physical simulation experiments.The effects of diversion drawing was compared with the results of non-diversion drawing experiments.It is found that the diversion drawing technique can significantly improve the ore loss ratio and dilution ratio,especially for the efficient recovery of the footwall ore residue.The parameters’ range of stress-relieve and diversion were obtained through experiments.