Abstract: In view of huge reserves of tailings with high TFe content grading at 15.02% and mFe grade of 1.65% in tailings dam of Lunan Mining Company of Laiwu Steel & Iron Company, the re-grinding and re-concentration tests are carried out due to its huge recovery value. The test results show that the tailings are effectively treated by the process of grinding-coarse magnetic separation-regrinding-magnetic separation -reserve flotation. By this method, final concentrate with Fe grade of 65.76%, the yield of 5.50% and the recovery of 24.08% were obtained, which brings significant economic benefit.

Key words: Lean magnetite, Tailings re-concentration, Magnetic separation, Reverse flotation