Abstract: In order to determine the technological process of producing super iron concentrate from a magnetite ore in Fushun,the beneficiation test was carried out.The high pressure roller mill closedcircuit rolling(wet screen)coarse particle low intensity magnetic separationgrinding classificationlow intensity magnetic separationpre classificationgrinding classificationlow intensity magnetic separationflotation process was adopted in the test.When the working pressure of high pressure roller mill is 8.5 MPa,the grinding fineness of first stage is -0.075 mm accounting for 65%,high frequency fine screen of highgrade iron concentrate with a width of 0.075 mm,the regrinding fineness of tower mill is -0.038 mm accounting for 90%,high purity iron concentrate via one roughing two cleaning cationic reverse flotation,the amount of dodecylamine added in different stages is 16.37+8.18+3.27 g/t,it can be obtained that: high grade iron concentrate with iron grade of 68.01% and total iron recovery of 86.21%;high purity iron concentrate with total iron grade of 70.95% and total iron recovery rate of 42.32%,byproduct iron concentrate with total iron grade of 65.40% and total iron recovery rate of 43.89%;super iron concentrate with total iron grade of 71.81%,total iron recovery rate of 17.93%,acid insoluble content of 0.14%,byproduct iron concentrate with total iron grade of 67.08% and total iron recovery rate of 68.28%.

Key words: Supergrade iron concentrate,Highpurity iron concentrate,Stagegrinding,Cationic reverse flotation,Acid insoluble content