无底柱分段崩落法不同回采顺序的损失贫化研究

发布时间：2018-04-25 22:43

本文选题：无底柱分段崩落法 + 回采顺序　；参考：《金属矿山》2016年02期

【摘要】：无底柱分段崩落法的回采顺序对矿石的损失贫化有很大影响。大红山铁矿井下受到露天压矿的影响,以70°为压矿界限,必须先回收可采矿体,待解除露天压矿之后再回收被压矿体。目前所研究的损失贫化大多是基于上分段采完再采下分段的情况,对这种先采矿体一侧再采另一侧形成的高落差引起矿石的损失贫化研究甚少。使用实验室物理放矿模拟对上述分期出矿和正常回采顺序出矿的损失贫化进行了对比研究,结果发现分期出矿回贫差指标低于正常出矿7.1个百分点。分析发现正常出矿的矿岩接触面是连续的,而分期出矿被截断成2个不同标高的"V"形接触带,使废石混入面增多,导致贫化率比正常出矿高。研究还发现随着放矿落差的增大,回贫差在缓慢减小。最后建议矿山尽可能地降低放矿之间的落差,或者采用低贫化放矿的方式进行出矿,以保留70°矿岩接触带来控制损失贫化。
[Abstract]:The mining sequence of sublevel caving without bottom pillar has great influence on ore loss and dilution. Under the influence of opencast pressure in Dayongshan Iron Mine, the orebody must be recovered first, and then the orebody should be recovered after the open-pit pressure is released. At present, most of the study on loss dilution is based on the situation of the mining in the upper section and then the next, but there is little research on the loss and dilution of the ore caused by the high drop caused by the first mining body and the other side of the mining body. By using laboratory physical drawing simulation, the loss and dilution of ore produced by stages and normal mining sequence are compared. The results show that the poor index of ore recovery by stages is lower than that of normal ore drawing by 7.1 percentage points. It is found that the contact surface of ore and rock of normal ore drawing is continuous, while the stage drawing is cut into two "V" contact zones with different elevation, which makes the mixed surface of waste rock increase and the dilution rate is higher than that of normal ore drawing. It is also found that with the increase of drawing drop, the return poor difference decreases slowly. At last, it is suggested that the drop between ore drawing should be reduced as far as possible, or the ore drawing should be carried out by low dilution, so as to keep 70 掳contact between ore and rock to control loss and dilution.
【作者单位】：西安建筑科技大学材料与矿资学院;
【分类号】：TD853.362

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