矿岩松散体安息角对矿岩界限划分的影响研究[1]

为分析自然安息角对露天矿采出矿石品位的影响，本文采用EDEM仿真模拟和无人机测绘及Surpac软件辅助分析两种方法对纳米比亚湖山露天铀矿台阶爆破后自然安息角进行了测定和对比分析，并基于自然安息角构建了铲装矿岩界线的数学模型。结果表明：自然安息角仿真模拟值与无人机测绘及Surpac软件辅助分析实测值平均偏差0.775°，最大偏差率为3.8%，两种方法均可精确地测定矿岩松散体自然安息角。以纳米比亚湖山露天铀矿为算例，采用铲装矿岩界线的数学模型测算自然安息角对矿岩界限影响，经测算，全寿期满足水冶条件的矿石量增加0.65 Mt，可多回收金属铀超过190 t。

Study on the Effect of Repose Angle of Material Loose Body on? Ore-rock Boundary

To analysis the influence of natural repose angle on the mined ore grade in open-pit mine, post-blast stockpile natural repose angle of African uranium open-pit mine, by using EDEM simulation, drone survey and Surpac software assisted analysis methods, were measured and compared. The mathematical model for predicting boundary of ore-rock was built based on the natural repose angle. The results shows that, average deviation between the simulated data and measured data of natural repose angle is 0.775°, and the maximum deviation rate is 3.8%. Both of methods can accurately measure the natural repose angle of loose ore and rock. Take the African uranium open-pit mine as an example, the mathematical model of ore-rock boundary was used to calculate the effect of natural repose angle on ore-rock boundary. It is estimated that the amount of valuable ores will increase by 650,000 tons and more than 190 tons of uranium metal can be recovered.