关键词: 铁矿石, 磷灰石, 磁铁矿, 先磁后浮, 先浮后磁

Abstract: In order to solve the problems of complicated process， serious sliming of iron tailings， phosphorus loss caused by mud removal operation， and the complicated reagent system of phosphorus flotation due to the beneficiation process “pre-iron and post-phosphorus” in Baiquan iron ore， the test process of “pre-phosphorus and post-iron， pre-flotation and post-magnetic separation” was studied. The results showed that using closed-circuit flotation of one roughing-three cleaning-two scavenging to treat with the raw ore under the conditions of first stage grinding to -0.074 mm accounting for 40%， BQ-2 as flotation collector and sodium silicate as regulator， respectively， phosphorus concentrate with P2O5 grade of 31.58% and recovery of 77.97% could be obtained. The one time low intensity magnetic separation – rough concentrate regrind （-0.045 mm 84%）—2 times low intensity magnetic separation process was adopted to deal with the phosphorus flotation tailings， iron concentrate with TFe grade of 66.21% and recovery of 47.03% could be obtained. Research results indicated that the new process not only could achieve ideal mineral processing indicators but may cut the concentrating and sliming process of phosphorus flotation feedings ， omit the addition of sodium carbonate， and avoid the problems of over grinding and sliming.

Key words: Iron ore, Apatite, Magnetite, pre-magnetic and post-flotation, Pre-flotation and post-magnetic