基于离散元法的多级配球提高半自磨机磨矿效率研究  

Comparative Experimental Study of Multi−stage Ball Distribution to Improve the Efficiency of Semi−autogenous Grinding

作　　者：国宏臣 肖庆飞[1,2] 李云啸 周强[1,2,4] 刘向阳[1,2,3] GUO Hongchen;XIAO Qingfei;LI Yunxiao;ZHOU Qiang;LIU Xiangyang(Kunming University of Science and Technology.State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources,Kunming 650093,China;School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093;State Key Laboratory of Mineral Processing Science and Technology,Beijing 100070,China;State Key Laboratory of Automatic Control Technology of Mining and Metallurgical Processes(Beijing),Beijing 100070,China)

机构地区：[1]昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,云南昆明650093 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]矿物加工科学与技术国家重点实验室,北京100070 [4]矿冶过程自动控制技术国家(北京市)重点实验室,北京100070

出　　处：《矿产保护与利用》2023年第4期60-67,共8页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金地区科学基金项目(51964044);云南省基础研究计划面上项目(202201AT070766);矿冶过程自动控制技术国家重点实验室开放基金项目(BGRIMM−KZSKL−2022−1);矿物加工科学与技术国家重点实验室开放基金项目(BGRIMM−KJSKL−2023−09)。

摘　　要：为解决四川攀枝花某铁矿选厂半自磨机中单一Φ150 mm钢球介质尺寸与给矿粒度及矿石力学性质不匹配、钢球尺寸单一导致磨机能耗高、效率低等问题,采用邦德球磨功指数实验及Azzaroni公式确定150 mm最大球径,通过D×L 450 mm×450 mm的小型磨机磨矿实验验证m(Ф150 mm)∶m(Ф120 mm)=1∶2的推荐钢球级配磨矿效果最好,进一步使用离散元(DEM)模拟仿真实验从碰撞能量的角度分析推荐钢球级配与单一Φ150 mm钢球尺寸现场钢球级配的能量利用率差异,最终确认推荐钢球级配效果最好。研究结果表明:推荐钢球级配比现场钢球级配顽石产率降低了0.32百分点,γ−0.074 mm产率提高了3.20百分点;离散元(DEM)模拟仿真实验结果表明:推荐钢球级配较现场钢球级配的切向碰撞能量利用率提高了2.98百分点,法向碰撞能量利用率提高了1.90百分点,对衬板的碰撞能量降低了306.9 J。从而验证了多级配球可有效提高半自磨机能量利用率。A singleΦ150 mm steel ball media size in a semi−autogenous grinding ball mill in an iron ore plant in Panzhihua,Sichuan does not match the feed size and the mechanical properties of the ore,and the single steel ball size leads to high mill energy consumption and low efficiency.The maximum ball diameter of 150 mm was determined by using Bond Gong ball mill index test and Azzaroni formula,and the recommended steel ball grading of m(Ф150 mm)∶m(Ф120 mm)=1∶2 was verified to be the best by grinding test in a small mill with D×L 450×450 mm.The recommended steel ball gradation was finally confirmed to be the best.In this study,the results of laboratory grinding tests showed that the recommended steel ball grading reduced the stubborn yield by 0.32 percentage points and increased the yield ofγ-0.074 mm by 3.20 percentage points compared with the on-site steel ball grading;the results of discrete element(DEM)simulation experiments showed that the recommended steel ball grading increased the tangential collision energy utilization by 2.98 percentage points and the normal collision energy utilization by 1.90 percentage points compared with the on−site steel ball grading.The results of discrete element(DEM)simulation experiments show that the recommended ball gradation has improved the tangential collision energy utilization by 2.98 percentage points,the normal collision energy utilization by 1.90 percentage points,and the collision energy to the liner plate by 306.9 J.Thus,it is verified that multi−stage ball gradation can improve the energy utilization of semi−autogenous grinding ball mill.

关 键 词：邦德功指数 多级配球 半自磨 碰撞能量分布 离散元法 顽石 

分 类 号：TD921.4[矿业工程—选矿]