Abstract: The ores' characteristics of Masteel Heshangqiao Iron Ore were investigated,and tests on the high-pressure grinding roll were studied.Based on this,a series of beneficiation tests research have been finished from the flow-sheets of stage grinding,stage separation,fine screening,regrinding and re-separation for over-size screening,high pressure grinding roll,stage-separation,fine screening,and again regrinding and re-separation for over-size screening,as well as the flow-sheet of high pressure grinding roll,3~0mm tailing rejection,stage grinding,stage separation,fine screening,and regrinding and re-separation for over-size screenings.A good concentrate grading at 64.87%~66.06% with a 72.00% recovery has been achieved.Due to the characteristics of low grade magnetite,and according to the comparison of the flow-sheet index,operation costs,and flow-sheet reasonability,two flow-sheets consisting of the high-pressure grinding roll,stage grinding,stage separation,fine screening and regrinding and re-separation for over-size screening,as well as the flow-sheet of high-pressure grinding roll,3~0mm tailing rejection,stage grinding,stage separation,fine screening,and regrinding and re-separation for over-size screenings are recommended for Heshangqiao Iron Mine.        

Key words: Iron ore, High pressure Grinding Roll, Tailing rejection for coarse ore, Regrinding and re separation after screening from stage grinding and stage separation