一次回收双顶柱和间柱爆破技术及实践
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摘要
根据空场法的布置特点,一般情况下,矿柱的矿量约占到矿块矿量的30%,合理高效回收矿柱,对资源回收和矿山经济效益有显著影响。以东升庙铅锌矿850m中段矿柱群为研究对象,通过分析矿柱群分布和现场实际情况,最终确定间隔抽采的整体回收方案。通过比较分析,确定16号矿柱为首采矿柱,采用中深孔、深孔联合爆破技术,一次回收16号矿柱及两侧顶柱,采用微差爆破技术,间柱利用两侧空区为自由面先起爆,顶柱利用下部空区为自由面后起爆,由于顶柱面积大,采用分区微差爆破技术,形成多临空面立体分区控制爆破技术,充分利用原有空区,形成多向组合、不同爆破孔径的微差爆破技术。对回收指标进行统计计算,贫化率和损失率均控制在30%以下,一次回收矿量87 509t。
The pillars account for 30% of the ore content of the mine house in empty field mining method.Reasonably and efficiently recovering the ore pillars has a significant impact on resource recovery and mine economic benefits.Taking the 850 m middle pillar group of Dongshengmiao lead-zinc mine as the research object,the overall recovery plan for interval extraction is finally determined by analyzing the distribution of the pillar group and the actual situation on the site.Through the comparative analysis,it is determined that No.16 pillar is the first mining pillar,and the medium-deep hole and deep-hole combined blasting technology are adopted.The No.16 pillar and the top pillars on both sides are recovered at one time.The millisecond blasting technology is adopted.The free surface detonates first,and the top column uses the lower free area to initiate the detonation.Due to the large area of the top column,apartitioned millisecond blasting technique is used to form a multi-faceted open-space three-dimensional controlled blasting technique,making full use of the existing empty areas and forming multiple differential blasting technologies for combination and different blast apertures.Statistical calculations are performed on the recovery indicators.Both the depletion rate and the loss rate are controlled at 30%,and the amount of once-recovery ore is 87 509 t.
The pillars account for 30% of the ore content of the mine house in empty field mining method.Reasonably and efficiently recovering the ore pillars has a significant impact on resource recovery and mine economic benefits.Taking the 850 m middle pillar group of Dongshengmiao lead-zinc mine as the research object,the overall recovery plan for interval extraction is finally determined by analyzing the distribution of the pillar group and the actual situation on the site.Through the comparative analysis,it is determined that No.16 pillar is the first mining pillar,and the medium-deep hole and deep-hole combined blasting technology are adopted.The No.16 pillar and the top pillars on both sides are recovered at one time.The millisecond blasting technology is adopted.The free surface detonates first,and the top column uses the lower free area to initiate the detonation.Due to the large area of the top column,apartitioned millisecond blasting technique is used to form a multi-faceted open-space three-dimensional controlled blasting technique,making full use of the existing empty areas and forming multiple differential blasting technologies for combination and different blast apertures.Statistical calculations are performed on the recovery indicators.Both the depletion rate and the loss rate are controlled at 30%,and the amount of once-recovery ore is 87 509 t.
引文
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[5]王如坤,徐强,申超霞,等.大冶铁矿矿柱回采方式的研究[J].矿业研究与开发,2015,35(7):17-22.WANG Rukun,XU Qiang,SHEN Chaoxia,et al.Research on pillar recovery method in Daye iron mine[J].Mining Research and Development,2015,35(7):17-22.
[6]张飞,王滨,菅玉荣,等.东升庙矿9号矿柱回收采空区围岩稳定性分析[J].地下空间与工程学报,2012,8(6):1255-1260,1275.ZHANG Fei,WANG Bin,JIAN Yurong,et al.Stability analysis on recovery goaf surrounding rock of the pillar-9in Dongshengmiao mine[J].Chinese Journal of Underground Space and Engineering,2012,8(6):1255-1260,1275.
[7]胡道喜,尹宝昌.某铁矿山矿柱回收技术研究[J].金属矿山,2012(8):19-20,24.HU Daoxi,YIN Baochang.Pillar recovery technology research in a iron mine[J].Metal Mine,2012(8):19-20,24.
[8]郭生茂,刘涛,陈小平,等.白山泉铁矿残留矿柱回收技术及空区处理[J].有色金属:矿山部分,2014,66(6):18-20,29.GUO Shengmao,LIU Tao,CHEN Xiaoping,et al.Residual recovery technology and mined-out area processing of Baishanquan iron mine[J].Nonferrous Metals:Mining Section,2014,66(6):18-20,29.
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