Predicting breakage and the evolution of rock size and shape distributions in Ag and SAG mills using DEM
Predicting breakage and the evolution of rock size and shape distributions in Ag and SAG mills using DEM
复制标题
DOI：
10.1016/j.mineng.2013.01.007
复制
发表时间：
2013-09-01
影响因子：
4.8
通讯作者：
Loveday, B.
中科院分区：
文献类型：
--
作者：
Delaney, G. W.;Cleary, P. W.;Loveday, B.
应用离散元法预测球磨机的性能是具有挑战性的，因为在这个过程中有几种不同的破碎模式是活跃的。随着我们对破损和计算能力的了解的提高，值得重新审视以前的模拟任务，这些任务没有对测量过程产生令人满意的现实描述。在SAG 2006上，我们报告了在直径为1.2米的磨机中处理特征良好的矿石的模拟和测量结果。夸祖鲁-纳塔尔大学的这一装备良好的中试规模磨机已与一些新的矿石测试方法相结合，以测试不同的破碎模式。磨机设计允许在接近真实的时间内测量自磨机和半自磨机装料的细料生成率。更新后的模拟模型估计质量损失与颗粒的演变和嵌入的累积损伤和破损。为了更清楚地描述不同类型断裂的影响，这些模拟中不包括表面磨损。将模拟结果与实测结果进行了比较。累积损伤模型对于SAG操作更现实，但对于AG是不充分的。因此，任何现实的模型都必须包含几种断裂机制。问题，如有关建模输入颗粒破碎表征数据和模型的预测精度进行了讨论。皇冠版权所有（C）2013由爱思唯尔有限公司出版。保留所有权利。
Applying DEM to prediction of tumbling mill performance is challenging because several different modes of breakage are active in the process. As our knowledge of breakage and computational capacity improve, it is worth revisiting previous simulation tasks which did not produce a satisfactorily realistic description of a measured process. At SAG 2006, we reported the simulated and measured outcomes of treating a well characterised ore in a 1.2 m diameter mill. This well instrumented, pilot scale mill at the University of KwaZulu-Natal has been combined with some new approaches to ore testing to allow different modes of breakage to be tested. The mill design allows the rate of generation of fine material to be measured in close to real time for autogenous and SAG mill charges. The updated simulation model estimates mass loss with particle evolution and embeds the cumulative damage and breakage. To more clearly delineate the effects of different types of breakage, surface wear has not been included in these simulations. The simulated results are compared with the measured results. The cumulative damage model is more realistic for SAG operation but is inadequate for AG. Hence, any realistic model must incorporate several breakage mechanisms. Issues such as relating modelling inputs to particle breakage characterisation data and the accuracy of the predictions of the models are discussed. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.