摘要
磨矿过程是选矿工艺中的关键环节,直接影响有价矿物的解离效果和后续分选指标。以某矿山三段磨矿分级系统的浓缩磁选精矿为研究对象,针对传统钢锻磨矿介质存在的能耗高、钢耗高及过磨严重等问题,系统探讨了钢锻、钢球和瓷球3种磨矿介质对磨矿产品指标的影响。通过实验室试验,分析了不同磨矿时间、介质充填率、磨矿浓度条件下磨矿产品的粒度分布特性,并对比了各介质的磨矿效果与能耗。结果表明,瓷球磨矿在磨矿速率和过磨控制方面表现优异,尤其是混合球径瓷球(ϕ25 mm、ϕ20 mm、ϕ15 mm配比为5∶3∶2)的磨矿效果最佳,其-0.075 mm粒级产率达87.64%,过磨程度为31.67%,且单位能耗较钢锻降低27.43%。此外,瓷球+钢球混合磨矿方案在应对突发情况时也表现出较好的适应性。磨矿浓度为70%,介质充填率为38%时,瓷球磨矿的产品粒度分布更均匀,有利于后续磁选作业。研究结果为矿山磨矿工艺的优化提供了理论依据和技术支撑,表明瓷球替代传统钢锻介质具有可行性和经济性。
The grinding process is a key link in the beneficiation process,which directly affects the dissociation effect of valuable minerals and the subsequent separation index.Taking the concentrated magnetic separation concentrate of a third stage grinding and classification system in a mine as the research object,aiming at the problems of high energy consumption,high steel consumption and serious overgrinding in the traditional steel forging grinding medium,the effects of three kinds of grinding media,steel forging,steel ball and porcelain ball,on the indexes of grinding products were systematically discussed.Through laboratory tests,the particle size distribution characteristics of grinding productd under different grinding parameters of grinding time,medium filling rate,grinding concentration were analyzed,and the grinding effect and energy consumption of each medium were compared.The results show that the grinding of ceramic balls is excellent in grinding rate and overgrinding control,especially the grinding effect of mixed ball diameter ceramic balls(ϕ25mm,ϕ20mm,ϕ15mm ratio of 5∶3∶2)is the best.The yield of-0.075 mm particle size is 87.64%,the degree of overgrinding is 31.67%,and the unit energy consumption is 27.43% lower than that of steel forging.In addition,the ceramic ball+steel ball mixed grinding scheme also shows good adaptability in dealing with emergencies.When the grinding concentration is 70% and the medium filling rate is 38%,the product particle size distribution of ceramic ball grinding is more uniform,which is beneficial to the subsequent magnetic separation operation.The research results provide theoretical basis and technical support for the optimization of mine grinding process,and show that it is feasible and economical to replace the traditional steel forging medium with ceramic balls.
作者
刘建华
裴德健
杨西飞
李书钦
王玮
LIU Jianhua;PEI Dejian;YANG Xifei;LI Shuqin;WANG Wei(Mining Branch,Taiyuan Iron and Steel(Group)Co.,Ltd.;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.;State Key Laboratory of Metal Mining Safety and Disaster Prevention and Control;Anhui Province Chemical Engineering Geology Exploration Institute;National Engineering Research Center for Efficient Recycling of Metallic Mineral Resources)
出处
《现代矿业》
2025年第8期128-134,共7页
Modern Mining
基金
安徽省自然资源科技项目(编号:2024-K-3)。
关键词
磨矿介质
磨矿参数
负累积产率
能耗
grinding media
grinding parameters
negative cumulative production rate
energy consumption
