云南某金矿半自磨钢球尺寸优化及离散元仿真模拟分析  

Optimization of Steel Ball Size and Discrete Element Simulation Analysis of a Semi-autogenous Grinding Gold Mine in Yunnan

作　　者：谢浩松 肖庆飞[1,2] 张志鹏 任英东 XIE Haosong;XIAO Qingfei;ZHANG Zhipeng;REN Yingdong(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources,Ministry of Provincial Affairs,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]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

出　　处：《矿产保护与利用》2023年第1期57-65,共9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);云南省地方高校(部分)联合专项(2018FH001-051);云南省教育厅基金(2019J0738)。

摘　　要：针对云南某金矿半自磨顽石(-80+25 mm)累积严重的问题,在分析矿石力学特性和给矿粒度组成的基础上,根据段氏球径半理论公式计算确定理论最佳钢球尺寸,以钢球尺寸为单一变量,进行实验室磨矿循环试验对比不同方案磨矿指标,并通过离散元仿真模拟分析进行验证。研究结果表明:该矿石平均普氏硬度较大,中等偏硬,同时存在脆性及韧性较大的矿石;在磨矿循环过程中推荐Φ140 mm方案的顽石积累积趋势最小,4次循环后,顽石产率最低,为3.89%,较现场Φ120 mm方案降低3.50百分点,-2 mm合格粒级及-0.074 mm粒级产率最高,分别较现场Φ120 mm方案提高8.40和3.15百分点。推荐Φ140 mm方案较现场Φ120 mm方案顽石颗粒运动状态更活跃,碰撞能量分布更合理,介质对顽石单次碰撞比能耗及高能碰撞频次更高。从磨矿试验和离散元模拟仿真试验验证了推荐Φ140 mm方案半自磨降低顽石累积的有效性。To address the problem of the serious accumulation of hard rock(-80+25 mm)in semi-autogenous grinding mill of a gold mine in Yunnan,The theoretical optimum size of steel ball was calculated by Duan's semi-theoretical formula of ball diameter which was based on the determination of mechanical properties and particle size of ore feed.The grinding cycle test was carried out with the steel ball size as a single variable,and grinding effect was verified by discrete element simulation analysis.The results showed that the average platts hardness of the ore is relatively large,which is medium to hard,and there are relatively large brittleness and toughness at the same time.The recommendedΦ140 mm scheme had the lowest tendency to accumulate hard rock during the grinding cycle test.After 4 cycles,the hard rock yield was the lowest at 3.89%,3.50 percentage points lower than the on-siteΦ120 mm scheme,while the−2 mm pass grade and−0.074 mm grade yield were the highest,8.40 and 3.15 percentage points higher than the on-siteΦ120 mm scheme respectively.The recommendedΦ140mm scheme was more active than the on-siteΦ120 mm scheme in terms of hard rock particle motion,more reasonable collision energy distribution,and higher energy consumption and frequency of high-energy collision for single collision of hard rock by the media.The effectiveness of the recommendedΦ140 mm scheme for semi-autogenous grinding to reduce hard rock accumulation was verified from grinding tests and discrete element simulation tests.

关 键 词：金矿 磨矿 半自磨 顽石积累 钢球尺寸 离散元 

分 类 号：TD921.4[矿业工程—选矿]