After the process of stage-grinding and stage-concentration in Midi concentrator was transformed, the material properties of products were changed and the grade of the tailing was improved. In the tailing of iron separation, the grade of Tfe and TiO2 was 16. 16% and 11. 03% respectively, the iron grade of which is relatively high. So it' s necessary to carry on the experimental research on reduction of the iron grade. The results showed that when the technology of low-intensity magnetic separation was adopted,the iron concentrate with the yield of 5. 02% and the Tfe grade of 57. 24% and the recovery of 17. 78% was obtained and when the technological flowsheet of low-intensity magnetic separation-high-intensity magnetic separation—flotation was adopted,the titanium concentrate with the yield of 10.41% and the TiO2 grade of 47. 15% and the recovery of 44. 49% was obtained. When all tailings were mixed,the grade of Tfe and TiO2was 11.42%and 25. 97%respectively. This research result can provide reference for the process reformation of Midi concentrator.%攀钢密地选矿厂阶磨阶选流程改造后,产品的物料特性发生了变化,尾矿品位较改造前有所增加.选铁尾矿中品位TFe16.16％,TiO211.03％,尾矿中铁品位偏高,有必要进行降低尾矿中的铁品位的试验研究.研究结果表明,采用弱磁选可获得产率为5.02％,品位为TFe57.24％,回收率为17.78％的铁精矿；采用弱磁选—强磁选—浮选工艺流程,可获得产率为10.41％,TiO2品位为47.15％,回收率为44.49％的钛精矿.将所有尾矿混合,其混合尾矿降低至TFe1 1.42％,TiO25.97％,研究结果对密地选矿厂的流程改造有一定的参考作用.
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