基于深度还原的某稀土尾矿选铁试验

将某稀土尾矿磁选预抛尾后进行了深度还原-弱磁选工艺技术条件研究，并对深度还原产物和磁选铁粉进行了XRD分析。结果表明，试样适宜的深度还原条件为褐煤用量占试样与褐煤总质量的10%、还原温度为1 200 ℃、还原时间为60 min，还原产物磨矿细度为-74 μm 85%，弱磁选磁场强度为118 kA/m，最终获得了铁品位为91.00%、还原产物弱磁选作业回收率为90.83%、铁综合回收率达78.20%的磁选铁粉；深度还原使还原对象中的复杂铁矿物大都还原成了单质铁，还原产物具有较好的磨矿-弱磁选效果。

Experiments on Iron Concentration from a Rare-earth Tailing based on Deep Reduction

The technical conditions of deep reduction-low intensity magnetic separation are investigated for a rare earth tailings after preelected by magnetic separation, and the generations of the deep reduction and the magnetic iron powder are assayed by XRD. The results indicate that under the suitable conditions for deep reduction of the dosage of lignite accounting for 10% of the total mass of the sample and lignite, and the reduction temperature 1 200 ℃ for 60 min, and the suitable grinding of -74 μm 85% with magnetic field strength of 118 kA/m for low intensity magnetic separation, magnetic iron powder with Fe grade of 91.00% and the reduction recovery of 90.83% by low intensity magnetic separation, and total iron recovery of 78.20% are finally obtained. XRD analysis shows that complex iron minerals in the tests mostly become single iron. The iron in products of deep reduction can be better recovered by grinding and low intensity magnetic separation.