司家营铁矿废石选矿工艺研究

针对河北司家营铁矿废石堆存量大、铁品位低、嵌布粒度细、处理难度大的特点，提出采用预选-阶段磨矿-阶段磁选-阴离子反浮选工艺流程处理。结果表明：铁品位为18.79%的废石经永磁干式磁选机抛尾-中细粒高梯度湿式强磁选机抛尾，可以获得铁品位为29.25%、回收率为59.61%的预选精矿，预选精矿经两阶段磨矿-阶段磁选，可以获得铁品位为52.71%、回收率为48.50%的磁选混合精矿，磁选混合精矿以NaOH为pH调整剂、淀粉为抑制剂、CaO为活化剂、MF为反浮选捕收剂，经1粗1精2扫反浮选，获得了铁品位为65.97%、作业回收率为89.21%、对原矿回收率为43.27%的合格精矿，可以为该类废石的资源化利用提供参考。

Beneficiation Technology Study on Iron Waste Rock from Sijiaying

Aiming at the problems of large volume，low iron grade，fine disseminated，difficult to be separated，process of pre-separation-stage grinding stage magnetic separation magnetic separation-anionic reverse flotation process was put forward on iron waste rock from Sijiaying of Hebei Province.Results show that waste rock with iron grade of 18.79% via discarding by permanent magnet dry magnetic separator-middle and fine wet high gradient high intensity magnetic separator separation，pre-concentrate with iron grade of 29.25% and recovery of 59.61% was obtained，pre-concentrate via two stage grinding stage magnetic separation operation，magnetic mixed concentrate with iron grade of 52.71% and recovery of 48.50% was obtained，using NaOH as pH regulator，starch as depressor，CaO as activator，MF as reverse flotation collector，via one roughing-one cleaning-two scavenging reverse flotation，qualified concentrate with iron grade of 65.97%，yield recovery of 89.21%，the ore recovery rate is 43.27% was obtained，can provide reference for the recycle of the waste rock resources.