贫磁铁矿反浮选降硅试验

摘要

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 %.%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％.