贫磁铁矿反浮选降硅试验

Reverse flotation for silicon dioxide reduction of low-grade magnetite

湖北省某地具有较为丰富铁矿资源,矿石中铁含量较低,原矿中全铁(TFe)含量约15%,属于贫磁铁矿,铁矿物的嵌布粒度较细,通过单一弱磁选很难得到全铁品位超过60%的铁精矿,针对该矿弱磁选精矿进行反浮选提铁脱硅研究,一粗一精开路反浮选流程精矿品位可达60%以上,铁回收率60%,产率50%左右.通过小型闭路试验,反浮选最终获得较好指标:精矿产率为68.57%,品位为58.62%,回收率为82.83%.

Iron ore resource of Hubei is relatively rich,but iron content is low,about 15 % only,belonging to low-grade magnetite.Particle size is so fine that it is difficuit to improve the grade of concentrate over 60 % through weak magnetic separation.Based on reverse flotation for silicon dioxide reduction of iron ore,the results of tests show that the grade of iron concentrate is over 60 %,recovery is 60 % and production rate is about 50 % by adopting a circuit of one rough floatation and one concentrating.Good flotation index gets at last through closed-circuit test ： the concentrate production rate is 68.57 %,the grade is 58.62 %,and the recovery rate is 82.83 %.