纳米复合瓷球作磁铁矿细磨介质磨矿特征研究  

Study on Grinding Characteristics of Nano-composite Ceramic Ball as Magnetite Fine Grinding Medium

作　　者：李哲阳 许辉[2] 谢峰 李龙龙[3] 张小普 姚鑫 吴彩斌[1,4] LI Zheyang;XU Hui;XIE Feng;LI Longlong;ZHANG Xiaopu;YAO Xin;WU Caibin(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Mining Branch,Taiyuan Iron&Steel(Group)Co.,Ltd.,Taiyuan 030027,Shanxi,China;Jianshan Iron Mine,Mining Branch,Taiyuan Iron&Steel(Group)Co.,Ltd.,Taiyuan 030301,Shanxi,China;Jiangxi Provincial Key Laboratory of Low-carbon Processing and Utilization of Strategic Metal Mineral Resources,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]太原钢铁(集团)有限公司矿业分公司,山西太原030027 [3]太原钢铁(集团)有限公司矿业分公司尖山铁矿,山西太原030301 [4]战略金属矿产低碳加工与利用江西省重点实验室,江西赣州341000

出　　处：《黄金科学技术》2024年第4期694-703,共10页Gold Science and Technology

基　　金：国家自然科学基金项目“磁铁矿/石英/方解石多元矿物体系中选择性磨矿机理研究”(编号:51764015)资助。

摘　　要：三段磨矿工艺通常采用钢锻或钢球作为细磨介质,存在高能耗、高球耗和粒度分布特性差等问题。以尖山铁矿三段球磨机给矿作为研究对象,进行了批次磨矿试验,研究了钢锻和瓷球作为细磨介质下的磨矿动力学特征以及瓷球磨矿工艺参数对产品粒度特性的影响。结果表明:超细粒级磁铁矿磨矿动力学线性特征不明显,更倾向于一阶磨矿动力学特征,且瓷球的细磨能力优于钢锻。瓷球磨矿工业应用后,在相同溢流细度和铁精矿品位下,球耗降幅达17.52%,节电幅度达42.37%,综合磨矿成本下降32.11%。瓷球可作为新型介质完全替代钢锻磨矿。The three-stage grinding process commonly utilizes steel forging or steel balls as the fine grinding medium,resulting in issues such as high energy consumption,high ball consumption,and poor particle size distribution.Introducing a new grinding medium,nano-composite ceramic balls,offers a range of superior properties including high hardness,good wear resistance,low energy consumption,and reduced over-crushing.Despite these advantages,ceramic balls have not yet been incorporated into the three-stage grinding process or fine grinding operations.The study conducted a batch grinding experiment using the three-stage ball mill feed from Jianshan iron mine as the focus of research.The investigation examined the grinding dynamics and statistical properties of steel forging and ceramic balls as fine grinding media,and analyzed the impact of ceramic ball grinding process parameters on product particle size characteristics.Comparison of the mean values of R^(2) and error in kinetic fitting characteristic parameters revealed a poor fit for the degree of n and first-order linear fitting in ultra-fine grained magnetite.The linear characteristics of ultra-fine grained magnetite grinding dynamics are not readily apparent and exhibit a significant margin of error,yet they predominantly align with first-order grinding dynamics.A comparison of the grinding kinetic parameter k indicates that ceramic balls demonstrate superior fine grinding capabilities compared to steel forging.Additionally,the analysis of particle size characteristics in batch grinding products and fine grade regeneration rates suggests that optimal grinding conditions entail a grinding concentration of 75%,a medium filling rate of 38%,and an ideal mixing ratio of allceramic ball diameters atΦ25:Φ20:Φ15 of 50%:30%:20%.The optimal mixing ratio of ceramic balls and steel balls,with diameters ofΦ25,Φ20,andΦ15 mm in proportions of 50%,30%,and 20%respectively,resulted in a filling rate of 32%for the mixed porcelain balls.In comparison,using single diameter 30 mm s

关 键 词：磨矿动力学 纳米复合瓷球 钢锻 超细粒级磁铁矿 磨矿能耗 磨矿特征 

分 类 号：TD921.4[矿业工程—选矿]