无底柱分段崩落法不同放矿方式下崩矿步距研究

发布时间：2018-11-23 08:32

【摘要】：以梅山铁矿为研究对象,在分段高度×进路间距为18 m×20 m的大结构参数下,设置不同的步距,分别采用无贫化放矿、低贫化放矿和现行截止品位放矿3种方式进行相似材料模拟实验。结合PFC2D数值模拟,分别从正面和侧面2个方向对矿石回收及废石混入进行模拟分析。研究结果表明:无贫化放矿、低贫化放矿和截止品位放矿3种出矿方式的最优崩矿步距分别为4.5,3.8和3.8 m。无贫化放矿方式基本不破坏矿岩界面的完整性,减少矿岩的混杂机会,因而能最大限度地降低贫化;不同的放矿方式有不同最优放矿步距,当终止出矿时,步距较大,则混入废石主要来源于上部,正面残留较多;当步距较小时,正面废石会过早混入,整体回收率低;当步距适中时,正面废石和上部废石同时混入,回收效果较好。
[Abstract]:Taking Meishan Iron Mine as an object of study, under the large structural parameters of 18m 脳 20m spacing of segmental height 脳 route, different step distances were set, and no dilution ore drawing was adopted respectively. Similar material simulation experiments were carried out in three ways: low dilution ore drawing and current cutoff grade drawing. Combined with PFC2D numerical simulation, ore recovery and waste rock mixing were simulated and analyzed from two directions: front and side. The results show that the optimal caving distance of the three ore drawing modes is 4.5U 3.8 and 3.8 m, respectively, which is no dilution drawing, low dilution drawing and cutoff grade drawing. The non-dilution drawing mode basically does not destroy the integrity of the ore-rock interface and reduces the mixed opportunity of the ore and rock, so it can reduce the dilution to the maximum extent. Different ore drawing methods have different optimal drawing distance. When the stoppage is large, the mixed waste rock mainly comes from the upper part, and the positive side remains more, when the step distance is small, the front waste rock will be mixed too early, and the overall recovery rate will be low. When the walking distance is moderate, the positive waste rock and the upper waste rock are mixed at the same time, and the recovery effect is better.
【作者单位】：北京科技大学土木与资源工程学院;
【基金】：国家自然科学基金资助项目(51374032,51674015) 科技北京百名领军人才培养工程基金资助项目(Z151100000315014)~~
【分类号】：TD853.362;TD861.1

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