用河北某地磁铁矿石制备超纯铁精矿

河北某地磁铁矿石铁品位为35.94%,磁性铁占总铁的90.40%,有害元素硫、磷含量均较低。为了提高矿山企业的经济效益,提高产品的市场竞争力,对矿石进行了超纯铁精矿生产工艺研究。结果表明:1矿石在一段磨矿细度为-0.074 mm占64.16%、弱磁选1磁场强度为39.81 k A/m、二段磨矿细度为-0.037 mm占80.59%、弱磁选2磁场强度为19.90 k A/m情况下,可获得铁品位为69.57%、铁回收率为96.03%的弱磁选铁精矿。2弱磁选铁精矿在给矿浓度为20%、悬振锥面选矿机分选面转动速度为1.23 r/min、盘面振动频率为390次/min、给矿速度为0.40 t/h、冲洗水流速为1.08 m~3/h的情况下2次精选,可获得全铁品位为71.67%、Si O_2含量为0.19%、铁回收率为84.89%的超纯铁精矿,以及铁品位为62.90%、铁回收率为23.10%的普通铁精矿,总铁回收率高达96.03%。

Using Iron Ore in Hebei for the Preparation of Super Pure Iron Concentrate

The iron grade of magnetite ore in Hebei was 35.94%,magnetic iron account for 90.40% of the total iron, and the content of sulfur and phosphorus was low.In order to improve the economic benefits of mining enterprises,to improve the competitiveness of products,the production technology of super pure iron concentrate made from the ore were studied.The results showed that① when the grinding fineness was 64.16% -0.074 mm,the first low intensity magnetic field intensity was 39.81 kA/m and the second stage of the grinding fineness was-0.037 mm accounted for 80.59%,the second stage of low in-tensity magnetic field intensity was 19.90 kA/m,the iron concentrate with iron grade 69.57% and iron recovery rate was 96.03% can be obtained.②When the feeding density was 20%,the separation surface rotation speed was 1.23 r/min,the disk vibration frequency was 390 times/min,the feeding speed was 0.40 t/h,and flushing water velocity was 1 .08 m3/h,after 2 times concentration selection of the suspension and vibrate of cone concentrator,super pure iron concentrate with total iron grade of 71.67%,the content of SiO2 was 0.19% and iron recovery rate of 84.89% can be obtained,as well as normal iron concentrate with iron grade of 62.90% and iron recovery rate of 23.10%,and total iron recovery reach 96.03%.