某矿石准静态加载破碎特性试验与模拟研究  

Experiment and Simulation Study on Crushing Characteristics of Ore Under Quasi-static Loading in a Mine

作　　者：郝书灏 蔡改贫[1,2] 余成 陈慧明 HAO Shuhao;CAI Gaipin;YU Cheng;CHEN Huiming(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Province Engineering Research Center for Mechanical and Electrical of Mining and Metallurgy,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]江西省矿冶机电工程技术研究中心,江西赣州341000

出　　处：《黄金科学技术》2023年第2期323-330,共8页Gold Science and Technology

基　　金：国家自然科学基金项目“基于多尺度内聚颗粒模型的振动破碎能耗研究”(编号:51464017);江西省重点研发计划项目“中低速选择性高能层压圆锥破碎智能装备关键技术研究及示范”(编号:20181ACE50034)联合资助。

摘　　要：为研究某矿石(硅质岩)准静态加载破碎特性,在压筒加载试验的基础上,利用Tavares破碎模型建立了矿石颗粒群破碎模型,对比分析了压筒加载试验与破碎仿真的破碎过程及特征。结果表明:(1)随着加载压力的增加,矿石颗粒群的破碎主要划分为3个阶段:紧密阶段,矿石颗粒群的空隙率减少,逐渐形成几个较为可靠的接触点,基本不会发生矿石颗粒的破碎;破碎阶段,矿石颗粒之间更加密实,矿石之间接触点的受力增大,部分矿石发生破碎;结团阶段,矿石颗粒被压实而产生大量细粉颗粒,进而发生结团现象。(2)在最大加载压力为400 kN的情况下,随着窄粒级(2 mm范围)矿石入料粒度的减小,碎后小颗粒的占比更高,不同入料粒径对破碎后小颗粒的占比有一定影响。(3)通过仿真与试验对比,将破碎仿真可视化,更好地描述破碎特征,同时验证了Tavares模型的有效性,标定了某矿石的仿真参数,为矿石颗粒的破碎仿真提供了新的方法,研究结果为后续破碎机设计提供了新的思路。In order to study the crushing characteristics of ore(siliceous rock)in a mine under quasi-static loading,a crushing model of ore particle group was established by using Tavares crushing model on the basis of cylinder loading test,and the crushing characteristics of cylinder loading test and crushing simulation analysis were compared and analyzed.The results show that:(1)The breakage of ore particle group can be divided into three stages.In the tight stage,the void fraction of ore group is decreasing,and the breakage process of ore particle group basically does not occur.In the crushing stage,the void fraction further decreases,the stress on thecontact points between ore increases,and some ore begin to break.In the agglomerating stage,the stress of oreparticle group will increase rapidly,a large number of fine powder particles will be produced,and theagglomeration phenomenon will occur.(2) When the maximum loading pressure is 400 kN,with the decrease ofthe feeding particle size of ore with narrow particle size (2 mm range),the higher the proportion of smallparticles after crushing,the proportion of crushed ore of -6 mm under different particle sizes of -18+16 mm,-16+14 mm and -14+12 mm is 25.63%,29.45% and 33.46%,respectively.(3) The effectiveness of the Tavaresmodel is verified by the comparison between simulation and experiment,and the simulation parameters of ore ina mine are calibrated,which provides a new method for the simulation of ore particle crushing,and the researchresults provide a new idea for the subsequent design of crusher.

关 键 词：脉石颗粒群 压筒试验 破碎特性 Tavares模型 准静态加载 破碎模型 

分 类 号：TD912[矿业工程—选矿]