Abstract: The iron of a fine fraction low intensity magnetic separation iron tailings with iron grade of 16.56% and profound loss of iron in fine fraction minerals mainly existed in the form of hematite and limonite,strong magnetic separation-screening-spiral chute-centrifuge separation test was conducted.The results showed that iron concentrate with iron grade of 56.16%,recovery rate of 20.25% was obtained when vertical chute-centrifuge backwashing water pressure was 580 kPa,rotate speed was 818 r/min,feed pulp density was 10%,pinch valve opening time was 660 ms.

Key words: Vertical chute-centrifuge, Flowing film concentration, Fine fraction tailings, Gravity separation