Operation Analysis of a SAG Mill under Different Conditions Based on DEM and Breakage Energy Method
Operation Analysis of a SAG Mill under Different Conditions Based on DEM and Breakage Energy Method
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DOI：
10.3390/en13205247
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发表时间：
2020-10
期刊：
影响因子：
3.2
通讯作者：
Qiyue Xie;Caifengyao Zhong;Daifei Liu;Q. Fu;Xiaoli Wang;Zhongli Shen
中科院分区：
文献类型：
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作者：
Qiyue Xie;Caifengyao Zhong;Daifei Liu;Q. Fu;Xiaoli Wang;Zhongli Shen
半自磨机是矿山开采中广泛使用的机械设备之一，它能显著提高岩石的粗磨效率。但半自磨机还面临着能耗大、经验操作参数等问题。为了获得半自磨机的最佳操作参数，采用离散元法（DEM）模拟了半自磨机的破碎过程，通过控制三个参数，磨机速度比、磨机填充水平比和钢球比。该方法模拟了半自磨机的磨矿粒度、磨机功率和破碎后的合格颗粒质量，揭示了半自磨机的粉磨强度和能耗。探讨了半自磨机在不同参数条件下的磨矿变化规律。首先建立了单参数变化对磨机运行影响的实验，然后分析了三个参数变化对磨机运行的影响。这些变化的特征在于粒度和磨机功率。在φ 5250 × 500 mm磨机模型下的仿真结果表明，磨机在80%临界转速和15%充填率条件下运行效果最佳，磨机的功率并不随磨机速比的增加而线性增加，而是在临界转速达到85%后下降，最后再次增加;半自磨机的最佳钢球比取决于模拟时间（磨机实际工作时间）和额定功率的限制。磨机转速、料位比、钢球比对磨机运行有显著影响，本文的结论可为实际情况提供参考。
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters. In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling three parameters, i.e., the mill speed ratio, the mill fill level ratio, and the steel ball ratio. This method simulates the particles size, mill power, and qualified particles quality of crushed particle, which reveal the grinding strength and energy consumption of the SAG mill. In this paper, the grinding changes of a SAG mill under different parameter conditions are explored. Firstly, an experiment on the influence of a single parameter change on the mill’s operation is set up, and then the influence of three parameter changes on the mill’s operation is analyzed. These changes are characterized by particle size and mill power. Simulation results under the ∅5250 × 500 mm mill model show that the mill operates with the optimal effect when the mill is under the condition of 80% critical speed and 15% fill level; the power of the mill does not increase linearly with an increase in the mill speed ratio, but will decrease after 85% of the critical speed, and finally increase again; the optimal steel ball ratio in the SAG mill depends on the simulation time (mill actual working time) and the limitation of the rated power. The mill speed, fill level ratio, and steel ball ratio can significantly affect mill operation, and our conclusions can provide a reference for an actual situation.