西北干旱区某低品位磁铁矿石的全干法分选工艺研究  

Study on the Fully Dry Separation Process of a Low-Grade Magnetite Ore in the Arid Region of Northwest China

作　　者：赛明雨 杨任新[1] 高春庆[1,2] SAI Mingyu;YANG Renxin;GAO Chunqing(Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China;College of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中钢集团马鞍山矿山研究院总院股份有限公司,安徽马鞍山243000 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《金属矿山》2025年第4期122-127,共6页Metal Mine

基　　金：“十四五”国家重点研发计划项目(编号:2022YFC2904501,2022YFC2904502)。

摘　　要：我国西北干旱缺水地区的某低品位磁铁矿石全铁品位为14.87%、磁性铁品位为9.27%,为了探究全干法分选工艺的可行性进行了选矿工艺研究。结果表明,矿石中主要铁矿物为磁铁矿,脉石矿物为石英;磁铁矿与脉石矿物间的嵌布关系紧密,但界限清晰,多以单晶或集合体的形式填充在脉石矿物粒间,单体解离总体较容易;矿石在碎至粒度为-10 mm情况下干式磁力预选(278.66 k A/m)、预选精矿在高压辊磨机闭路辊压至-3 mm情况下进行粗粉干式磁选(358.28 k A/m)、然后进行两阶段磨矿(-0.074 mm分别为55%和80%)各1粗1精干式弱磁选(分别为278.66、199.04 k A/m),获得了全铁品位65.64%、全铁回收率57.34%、磁性铁回收率88.06%的铁精矿,该指标较经典磁选流程对应指标分别低0.24、2.26、8.29个百分点。研究结果表明,该矿石采用全干法分选工艺是可行的,对缺水地区类似铁矿石资源的开发具有指导意义,但全干法分选设备的台时效率有较大提升空间。A low-grade magnetite ore in the arid and water-scarce region of Northwest China contains total iron(TFe)of 14.87%and magnetic iron(MFe)of 9.27%.In order to investigate the feasibility of a fully dry separation process,mineral processing studies were conducted.The results showed that magnetite is the dominant iron mineral,with quartz as the gangue mineral.Magnetite exhibits closely intergrown yet distinct boundaries with gangue minerals,primarily occurring as single crystals or aggregates filling intergranular spaces of gangue particles,enabling generally easy monomer liberation.When processed through a fully dry route:the ore was crushed to-10 mm for dry magnetic pre-concentration(278.66 kA/m);the pre-concentrate was ground to-3 mm using closed-circuit high-pressure roller milling followed by coarse-particle dry magnetic separation(358.28 kA/m);then subjected to two-stage grinding(-0.074 mm at 55%and 80%respectively),each involving one roughing and one cleaning operation with low-intensity dry magnetic separation(278.66 and 199.04 kA/m).This yielded an iron concentrate with TFe grade of 65.64%,TFe recovery of 57.34%,and MFe recovery of 88.06%,representing reductions of 0.24,2.26,and 8.29 percentage points respectively compared to conventional magnetic separation benchmarks.The findings confirm the technical viability of fully dry separation for this ore,providing guidance for developing similar iron resources in water-deficient regions,though significant potential remains for improving the hourly throughput efficiency of fully dry separation equipment.

关 键 词：磁铁矿 全干法磁选 经典磁选工艺 

分 类 号：TD951[矿业工程—选矿]