弓长岭铁浮选尾矿浮选柱再选实验

针对弓长岭赤铁矿的浮选尾矿进行了磨矿—强磁选—中磁选预选实验，预选获得的磁选粗精矿铁品位为41.71%，产率为33.62%，铁回收率为84.21%；对比了浮选柱及浮选机粗选两种浮选工艺流程对预选粗精矿提质的影响。单因素实验结果表明浮选柱较佳工作参数为给矿压力0.08 MPa、充气量0.05 m³/h。经过浮选柱和两台浮选机组成的一粗一精一扫流程闭路实验，可以获得再选精矿产率为18.89%，品位为65.29%，铁回收率为74.07%的技术指标，相比于单一浮选机工艺的浮选铁品位和回收率，分别提高了0.27个百分点和2.61个百分点。

Study on Re-concentration of Flotation Tailings in Gongchangling Iron Plant

Pre-separation test of grinding-high intensity magnetic separation-medium magnetic separation was carried out on the flotation tailings of Gongchangling hematite. The iron grade of magnetic separation rough concentrate obtained by pre-separation is 41.71%, yield is 33.62% and iron recovery is 84.21%. The effects of two flotation processes, flotation column and flotation machine roughing, on the quality improvement of pre-concentration coarse concentrate were compared. The single factor test results show that the optimal working parameters of flotation column are feeding pressure 0.08 Mpa and aeration 0.05 m3/h. Through the closed-circuit test of one roughing, one cleaning and one scavenging process made of flotation column and two flotation units, the technical indexes of 18.89% concentrate mineral rate, 65.29% grade and 74.07% iron recovery can be obtained, which are 0.27 percentage points and 2.61 percentage points higher than that of single flotation machine process, respectively.