基于流固耦合的湿式球磨机磨矿效果离散元分析

金属矿山 ›› 2025, Vol. 54 ›› Issue (6): 182-187.

基于流固耦合的湿式球磨机磨矿效果离散元分析

李　培^1,2 　张　萌^3,4,5王　晓^1,2 　余永健^1,2　薛玉君^1,2,5

1. 河南科技大学机电工程学院,河南洛阳 471003;2. 河南省机械设计及传动系统重点实验室,河南洛阳 471003; 3. 中信重工机械股份有限公司,河南洛阳 471039;4. 洛阳矿山机械工程设计研究院有限责任公司,河南洛阳 471039; 5. 智能矿山重型装备全国重点实验室,河南洛阳 471039

出版日期:2025-06-15 发布日期:2025-07-09
通讯作者: 薛玉君(1971—),男,教授,博士,博士研究生导师。
作者简介:李　培(2001—),男,硕士研究生。
基金资助:
河南省重大科技专项(编号:241100220300)。

Discrete Element Analysis of Grinding Effect of Wet Ball Mill Based on Fluid-Structure Interaction

LI Pei ^1,2 　 ZHANG Meng ^3,4,5　 WANG Xiao ^1,2 　 YU Yongjian ^1,2 　 XUE Yujun ^1,2,5

1. School of Mechanical and Electrical Engineering,Henan University of Science and Technology,Luoyang 471003,China; 2. Key Laboratory of Mechanical Design and Transmission System in Henan Province,Luoyang 471003,China;3. CITIC Heavy Industries Co. ,Ltd. ,Luoyang 471039,China;4. Luoyang Mining Machinery Engineering Design Research Institute Co. ,Ltd. , Luoyang 471039,China;5. National Key Laboratory of Intelligent Mining Heavy Equipment,Luoyang 471039,China

Online:2025-06-15 Published:2025-07-09

摘要/Abstract

摘要： 湿式球磨机是工业生产中广泛应用的粉磨设备,其运行成本约占选矿厂总成本的 50%,提高磨矿效率对选矿厂节能增效具有显著积极意义。为了更好地理解磨矿工艺参数对磨矿效率的影响,以便更好地指导工业生产,开展了基于流固耦合的湿式球磨机磨矿效果离散元分析。研究以 ϕ2. 7 m×4 m 的湿式球磨机为研究对象,采用 DEM-VOF 方法建立了磨机内气-液-固三相流耦合模型,分析了不同矿浆浓度下物料的运动状态及碰撞能量利用率。结果表明:磨矿效果与矿浆浓度密切相关,当矿浆浓度较低时,“死区”颗粒占比较高,导致磨矿效率降低;随着矿浆浓度的提高,物料流动状态显著改善并趋于稳定,磨矿效率随之提升;当矿浆浓度为 90%时,磨机内部总碰撞能量达到峰值,但其能量利用率并非最高;相比之下,矿浆浓度为 80%时,能量利用率最高,该浓度下的总碰撞能量接近矿浆浓度 90%时,且显著高于其他 3 种磨矿浓度条件下,综合磨矿效率及衬板和磨矿介质的磨损情况,认为矿浆浓度宜为 80%。磨机内部磨矿介质与矿石的碰撞以低能级为主,因此,矿石破碎主要依赖冲击能量的多次累积效应;同时,切向碰撞能量高于法向碰撞能量,表明球磨机内的矿石破碎以磨剥作用为主导。

关键词: 湿式球磨机　流固耦合　离散单元法　矿浆浓度　磨矿效果

Abstract: Wet ball mill is a widely used grinding equipment in industrial production,and its operating cost accounts for about 50% of the total cost of the mineral processing plant. Improving grinding efficiency holds significant positive implications for energy saving and efficiency enhancement in mineral processing plants. In order to better understand the influence of grinding process parameters on grinding efficiency and thereby better guide industrial production,a discrete element method (DEM) analysis of the grinding effect in a wet ball mill based on fluid-solid coupling is carried out. The study takes the ϕ2. 7 m×4 m wet ball mill as the research object. A gas-liquid-solid three-phase flow coupling model within the mill is established using the DEM-VOF method,and the movement state of the materials and the collision energy utilization rate under different slurry concentrations are analyzed. The results showed that the grinding effect is closely related to slurry concentration. When the slurry concentration is low,particles in the dead zone account for a higher proportion,resulting in reduced grinding efficiency. With increasing slurry concentration,the material flow state significantly improves and stabilizes,leading to increased grinding efficiency. When the slurry concentration is 90%,the total collision energy inside the mill reaches its peak value;However,the energy utilization rate of this collision energy is not the highest. In contrast,at a slurry concentration of 80%,the energy utilization rate is the highest. The total collision energy under this concentration is close to that at 90% concentration and is significantly higher than under the other three tested grinding concentrations. Considering comprehensive grinding efficiency alongside liner plate and grinding media wear,a slurry concentration of 80% is deemed appropriate. Collisions between grinding media and ore inside the mill are dominated by low energy levels,indicating that ore breakage relies primarily on the cumulative effect of multiple impacts. Simultaneously,tangential collision energy is higher than normal collision energy,signifying that ore breakage inside the ball mill is dominated by the abrasive stripping effect.

Key words: wet ball mill,fluid-structure interaction,discrete element method,slurry concentration,grinding effect

中图分类号:

TD453

李　培, 张　萌, 王　晓, 余永健, 薛玉君. 基于流固耦合的湿式球磨机磨矿效果离散元分析[J]. 金属矿山, 2025, 54(6): 182-187.

LI Pei , ZHANG Meng , WANG Xiao, YU Yongjian, XUE Yujun . Discrete Element Analysis of Grinding Effect of Wet Ball Mill Based on Fluid-Structure Interaction [J]. Metal Mine, 2025, 54(6): 182-187.

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