基础颗粒粒径对颗粒黏结模型精度的影响

Influence of basic particle diameter on accuracy of bonded-particle model

应用离散元方法(Discrete elementmethod,DEM)仿真矿石破碎时,通常采用颗粒黏结模型对矿石进行建模,颗粒黏结模型中的基础颗粒粒径对仿真结果影响显著。为了研究基础颗粒粒径变化对模型精度的影响,本文设计了9组基础颗粒粒径组合,构建了矿石的颗粒黏结模型,进行了金矿石破碎的离散元仿真,得到了不同粒径组合下的破碎粒度分布,并将仿真结果与试验得到的破碎粒度分布进行了对比分析。结果表明:基础颗粒粒径组合对模型精度存在影响,采用适当的基础颗粒粒径组合构造颗粒黏结模型能够提高模型精度。当基础颗粒粒径之间的差值相当时,模型精度较高,仿真得到的破碎粒度分布和落重试验结果的一致性良好。对相同粒度的铁矿石与铜矿石进行了仿真,验证了基础颗粒粒径选取方法的有效性。

By using the discrete element method(DEM)for ore crushing simulation,the bonded-particle model is usually selected.The basic particle diameter in the bonded-particle model has a significant influence on the simulation results.In order to study the influence of the change of basic particle size on the accuracy of the model,nine groups of basic particle diameter combinations were designed to construct the bonded-particle model in this paper.Based on this model,the simulation on gold ore crushing processing was carried out using DEM,and the distribution of crushing sieving size grade under different particle diameter combinations was obtained.The simulation results were compared and analyzed with the experiment results.The results show that the combination of basic particle size has an impact on the accuracy of the model.Using a proper combination of basic particle size to construct a bonded-particle model could improve the accuracy of the model.When the difference between the basic particle diameters is uniform,the model accuracy is high,and the simulation results are in good agreement with the drop-weight test results.The simulations of iron ore and copper ore with the same particle size verify the effectiveness of the basic particle selection method.