摘要
为了提升复杂磁铁矿资源的高效开发与选矿节能降耗水平,以喀麦隆某低磷、低硫磁铁矿为对象,针对其均匀嵌布、难抛尾的矿石特性,对比了常规颚式破碎工艺与高压辊磨工艺的选矿效果。通过粒度分析、干式预选抛尾试验、Bond球磨功指数测定及磨矿—磁选试验发现:高压辊磨机破碎至-3 mm后,细粒级占比显著提高,干抛尾矿产率达25.85%,精矿TFe品位提升至44.31%;同时,Bond球磨功指数降低至8.80(kW·h)/t,磨矿能耗减少20%;最终,高压辊磨工艺在1次磁选后精矿TFe品位达65.32%,铁回收率为95.07%,显著优于颚式破碎工艺。研究表明,高压辊磨技术通过“多碎少磨、早选早抛”策略,可有效提升磁铁矿选矿效率,降低能耗,可为复杂磁铁矿资源的高效开发提供理论支撑和技术路线。
In order to improve the efficient development of complex magnetite resources and the level of energy saving and consumption reduction in beneficiation,a low-phosphorus and low-sulfur magnetite in Cameroon was taken as the object,and the beneficiation effects of conventional jaw crushing process and high pressure roller mill process were compared according to the ore characteristics of uniform distribution and hard discarding tailings.Through particle size analysis,dry preconcentration and discarding tailings test,Bond ball mill work index determination and grinding-magnetic separation test,it is found that after the high pressure roller mill is crushed to-3 mm,the proportion of fine particles is significantly increased,the dry discarding tailings yield rate is 25.85%,and the concentrate TFe grade is increased to 44.31%.At the same time,the Bond ball mill work index is reduced to 8.80(kW·h)/t,and the grinding energy con⁃sumption is reduced by 20%.Finally,the TFe grade of concentrate reached 65.32%and the iron recovery rate was 95.07%after one magnetic separation,which was significantly better than that of jaw crushing pro⁃cess.The research shows that the high pressure roller mill technology can effectively improve the beneficia⁃tion efficiency of magnetite and reduce energy consumption through the strategy of'more crushing and less grinding,early separation and early throwing',which can provide theoretical support and technical route for the efficient development of complex magnetite resources.
作者
陈爽
李朝朋
王珏
李锐
余建文
高鹏
CHEN Shuang;LI Zhaopeng;WANG Jue;LI Rui;YU Jianwen;GAO Peng(Shenyang Longji Electromagnetic Technology Co.,Ltd.;School of Resources and Civil Engineering,Northeastern University)
出处
《现代矿业》
2025年第5期125-129,共5页
Modern Mining
基金
辽宁省杰出青年基金项目(编号:2024JH3/50100011)。
关键词
磁铁矿
高压辊磨机
预选抛尾
Bond球磨功指数
磁选效率
节能降耗
magnetite
high pressure roller mill
pre-concentration and tailings discarding
Bond ball mill work index
magnetic separation efficiency
energy saving and consumption reduction
