摘要
无底柱分段崩落法广泛应用于国内地下铁矿山,具有开采效率高、成本低等优势,但矿石损失贫化大。通过多组进路宽度、边孔角放矿试验,从矿石贫化率、矿石回收率及结合放出体形态发育特征探究放矿指标变化原因。结果表明:(1)随着进路宽度边孔角的增加,矿石回收率随之增大,边孔角每增加10°,矿石回收率平均增加约3.13个百分点;进路宽度每增加0.5 m,矿石回收率增加约0.82个百分点,当进路宽度为5.5 m、边孔角为55°时,矿石回收率最高;(2)贫化率随着边孔角、进路宽度的增加呈先增加后减小的趋势,当进路宽度为4 m,边孔角为25°时贫化率最高,其中进路宽度对贫化率影响明显;(3)进路宽度、边孔角越大,放出体形态高度发育速度减慢,横向轴长发育速度增快,对纵向轴长发育速度影响不大。放出体形态的变化导致顶部废石量减少,放出矿岩量增加进而影响放矿指标。
Non-pillar sublevel caving method is widely used in domestic underground iron mines, and has the advantages of high mining efficiency and low cost, but large ore loss and dilution. Through the multiple sets of ore drawing experiments with different approach widths and side hole angles, the ore dilution rate and ore recovery rate were analyzed, and the change reasons of ore drawing indicators were explored by combining with the development characteristics of the morphology of the released body. The results show that with the increase of approach width and the side hole angle, the ore recovery rate significantly increases. The ore recovery rate is evenly increased by about 3.13 percentage points for every 10°increase in the side hole angle, and is evenly increased by about 0.82 percentage points for every 0.5 m increase in the approach width. When the approach width is 4 m and side hole angle is 55°, the ore recovery rate is the highest. The dilution rate first increases and then decreases with the increase of side hole angle and approach width. When the approach width is 4 m and the side hole angle is 25°, the dilution rate is the highest. The approach width has a significant effect on the dilution rate. The larger the approach width and the side hole angle, the slower the growth rate of the morphology of the released body. The development rate of the transversal axis length increase fast, but the development rate of longitudinal axis length has little effect. The change in the shape of the released body leads to the decrease of waste rocks at the top and the increase of released ore, so as to influence the ore drawing indicators.
作者
林洪叶
张治强
任崇阁
马驰
曹朋
LIN Hong ye;ZHANG Zhiqiang;REN Chongge;MA Chi;CAO Peng(School of Mining Engineering,University of Science and Technology Liaoning,Anshan,Liaoning 114051,China;Engineering Research Center of Green Mining of Metal Mineral Resources Liaoning Province,Anshan,Liaoning 114051,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第9期33-37,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(51774176)。
关键词
进路宽度
边孔角
无底柱分段崩落法
放矿效果
Approach width
Side hole angle
Non-pillar sublevel caving method
Drawing effect
