Abstract: 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 Makeng,FuJian were conducted.The results show that HPGR product has more fine particles,compared with conventional comminution process,can satisfy the particle demand of wet mid intensity magnetic preconcentration.With the same grinding conditions,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 magnetic 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 energy and quality and efficiency for Makeng iron mine.

Key words: HPGR, Magnetite ore, Effective comminution process, Wet preconcentration