马坑磁铁矿石高压辊磨—湿式中磁预选—阶段磨选工艺试验

为探索采用高效碎磨工艺处理福建马坑铁矿石的可行性,进行了高压辊磨—湿式中磁预选—阶段磨选工艺流程试验。结果表明:较常规碎矿工艺,高压辊磨破碎获得的产品细粒级含量显著提高,能够满足湿式中磁预选的粒度要求;磨矿条件相同时,高压辊磨产品相对传统颚式破碎产品新生成-0.074 mm粒级含量高,相对可磨度高;高压辊磨产品(-5 mm)经湿式中磁预选—两阶段磨矿弱磁选,可在磨前抛出38.88%的合格尾矿,并可获得铁品位为66.75%、磁性铁品位为65.95%、铁回收率为80.21%、磁性铁回收率为96.25%的铁精矿,精矿铁品位较现场提高了2.66个百分点、铁回收率提高了0.30个百分点,可作为马坑铁矿节能降耗、提质增效改造设计的依据。

Experiment of HPGR Crushing-wet Mid Intensity Magnetic Preconcentration-stage Grinding and Separation on a Magnetite Ore from Makeng

To explore the feasibility of effective comminution process to deal with Makeng iron ore,Fujian,experiments of HPGR crushing-wet mid intensity magnetic preconcentration-stage grinding-magnetic technological of magnetite ore from Mak-eng,FuJian were conducted. The results show that HPGR product has more fine particles,compared with conventional commi-nution process,can satisfy the particle demand of wet mid intensity magnetic preconcentration. With the same grinding condi-tions,compared with conventional jaw crushed products,HPGR products has more new produced -0. 074 mm fraction,relative grindability is higher. Iron concentrate with iron grade of 66. 75%,iron recovery of 80. 21%,magnetic iron grade of 65. 95%and recovery of 96. 25% was obtained via wet mid intensity magnetic preconcentration-two stage grinding low intensity magnet-ic separation process on HPGR products(-5 mm) . Compared with the original process,the grade of iron concentrate increased by 2. 66 percentage points compared with on-site process,iron recovery increased by 0. 30 percentage points,and can throw out 38. 88% qualified tailings. More crushing less grinding aim was realized,offers technique basis for transformation on saving en-ergy and quality and efficiency for Makeng iron mine.