基于矿石真实破裂数值模拟的层压粉碎适宜料层厚度研究  

Research of Suitable Material Layer Thickness for Lamination Comminution Based on Numerical Simulation of Real Failure Process Analysis

作　　者：雷顺林 李丽匣[1] 付坤 刘栋杰 潘一鸣 张兴婕 LEI Shunlin;LI Lixia;FU Kun;LIU Dongjie;PAN Yiming;ZHANG Xingjie(School of Resources and Civil Engineering,Northeastern University,Shenyang,110819,Liaoning,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《矿产保护与利用》2023年第3期120-126,共7页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金(52174243)。

摘　　要：高压辊磨机以其独特的层压粉碎原理优势在金属矿山节能降耗中发挥着重要的作用,由于矿石力学性质、均质性、给矿粒度的不同,在相同设备中不同的床层厚度,会影响其层压粉碎效果。本文以鞍山式赤铁矿石为研究对象,基于矿石宏观力学性质及真实破裂数值模拟(RFPA),表征层压粉碎适宜颗粒床层厚度。首先进行矿石的抗压强度、抗拉强度试验,借助数值模拟表征矿石的均质度m。构建直径为10 mm赤铁矿颗粒、不同床层厚度的数值模型,在水平方向有约束条件下进行压载试验,模拟高压辊磨机的层压粉碎过程,通过应力传递、三维裂纹贯通破坏模式、相对粉碎能耗,确定适宜的料层厚度。结果表明,层压粉碎床层厚度为8层颗粒直径的粉碎形式表现为对角线贯通,有利于应力传递,促进整个床层颗粒产生粉碎,能量利用率高。本文的研究结果,为工业上确定高压辊磨机适宜的料层厚度提供研究基础。HPGR(High pressure grinding rolls)plays an important role in energy-saving and consumption-reduction in metal mines owing to its unique advantages in the lamination crushing principle.Given the differences in mechanical properties,homogeneity and particle size of feed ores,different material layer thickness in a same equipment affects HPGR lamination crushing performance.In this study,taking Anshan-type hematite ores as the research object,suitable particle layer thickness for lamination crushing was characterized based on the macro-mechanical properties and the numerical simulation of real fracture(RFPA)of ores.The tests of compressive strength and tensile strength of standard ore samples were first carried out,and the homogeneity m of ore was characterized by numerical simulation.Then,numerical models of variable layer thicknesses withΦ10 mm spherical hematite particles were configured,and the ballast tests were performed with horizontal constraint simulating the HPGR lamination comminuting process.Finally,an appropriate layer thickness was determined by analyzing the processes of stress transfer and three-dimensional crack penetration failure coupled with the relative energy consumption.It was shown that the fracture mode of configuration with a thickness of 8 layers was diagonal penetration,which was conducive to stress transfer promoting the comminution of particles in the whole bed with a high energy efficiency.Results provided a research basis for determining a suitable layer thickness of HPGR in industry.

关 键 词：高压辊磨机 层压粉碎 数值模拟 力学性质 

分 类 号：TD921[矿业工程—选矿]