攀西某铁矿不同截止品位下无底柱分段崩落法放矿试验

现代矿业 ›› 2026, Vol. 42 ›› Issue (01): 72-76.

攀西某铁矿不同截止品位下无底柱分段崩落法放矿试验

姚秋萍¹ 董秋平¹ 彭寿星² 陈树林²杨承业³李杰林³

1. 攀钢集团矿业有限公司设计研究院；2. 攀钢集团矿业有限公司朱兰铁矿分公司； 3. 中南大学资源与安全工程学院

出版日期:2026-01-25 发布日期:2026-02-05

Ore Drawing Test of Non-pillar Sublevel Caving Method under Different Cut-off Grades in an Iron Mine in Western Panzhihua

1. Design and Research Institute of Pangang Group Mining Co.，Ltd.；2. Zhulan Iron Mine Branch of Pan⁃ gang Group Mining Co.，Ltd.；3. School of Resources and Safety Engineering，Central South University

Online:2026-01-25 Published:2026-02-05

摘要/Abstract

摘要： 为了掌握无底柱分段崩落法开采矿山不同放矿截止品位对矿石贫化率、损失率指标的影响规律，依托攀西某铁矿的采场结构参数，建立了放矿相似物理模型，开展了 20%、23% 的不同截止品位下的放矿相似模拟试验。结果表明，2 种截止品位条件下放矿时，矿岩散体流动特点基本一致，且每一分段的脊部残留矿体均明显存在，会在下一分段被逐渐放出；当放矿截止品位从 20% 提高至 23% 时，矿石回采率、废石混入率和矿石贫化率均呈现不同程度的降低，降低幅度分别为 7.94，1.77 和 1.12 个百分点，而采出品位提高 0.44 个百分点。最终推荐矿山采用 23% 截止品位进行放矿，试验研究结果为采用分段崩落法的矿山确定合理的放矿截止品位提供了依据。

关键词: 无底柱分段崩落法, 截止品位, 放矿, 贫化率, 损失率

Abstract: In order to grasp the influence of different cut-off grades on ore dilution rate and loss rate in sublevel caving mining without sill pillar，based on the stope structure parameters of an iron mine in western Panzhihua，a similar physical model of ore drawing is established，and similar simulation tests of ore drawing under different cut-off grades of 20 % and 23 % are carried out. The results show that the flow characteristics of ore rock are basically the same under the two cut-off grade conditions，and the residual ore bodies in the ridge of each segment are obviously present，which will be gradually released in the next segment. When the cut-off grade of ore drawing is increased from 20% to 23%，the ore recovery rate， waste rock mixing rate and ore dilution rate are reduced to varying degrees，and the reduction ranges are 7.94，1.77 and 1.12 perecentage points，respectively，while the recovery grade is increased by 0.44 pere⁃ centage points. Finally，it is recommended that the mine adopt 23% cut-off grade for ore drawing. The ex⁃ perimental results provide a basis for determining the reasonable cut-off grade of ore drawing in mines us⁃ ing sublevel caving method.

Key words: sublevel caving mining without sill pillar, cut-off grade, ore drawing, dilution ratio, loss ratio

姚秋萍, 董秋平, 彭寿星, 陈树林, 杨承业, 李杰林. 攀西某铁矿不同截止品位下无底柱分段崩落法放矿试验[J]. 现代矿业, 2026, 42(01): 72-76.

YAO Qiuping DONG Qiuping PENG Shouxing CHEN Shulin YANG Chengye LI Jielin. Ore Drawing Test of Non-pillar Sublevel Caving Method under Different Cut-off Grades in an Iron Mine in Western Panzhihua[J]. Modern Mining, 2026, 42(01): 72-76.

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