某复杂难选铁矿石提铁降硅工艺研究

对山西某难选高硅铁矿石进行了可选性试验研究。针对矿石嵌布粒度很细的特点, 采用阶段磨矿阶段选别工艺提铁降硅。得出适宜的磨矿制度: 一段磨矿粒度为-0.074 mm粒级占40%, 二段磨矿粒度为-0.038 mm粒级占85%; 对粗精矿再磨后的不同选别工艺进行了对比, 推荐最佳的工艺为磁-浮联合选别, 可获得全铁品位为65.37%、二氧化硅含量为4.26%的铁精矿, 达到了较好的提铁降硅效果。

Research on Technology for Iron-increase and Silicon-reduction of an Iron Ore

Experiments were carried out to learn the beneficiability of a refractory iron ore from Shanxi Province. As the dissemination size of the minerals of this high-silicon ore is very small, a technique featuring stage grinding and stage separation was used. A feasible grinding system includes two stages, with the grinding fineness for the first stage as -0.074 mm of 40% and for the second stage, -0.038 mm of 85%. Beneficiation approaches to treat the bulk concentrate were compared, and the best one should be the combined usage of magnetic separation and flotation, as the TFe grade of the as-prepared iron concentrate reached 65.37%, while the SiO₂ content was reduced to be 4.26%, showing that the purpose to increase iron grade while reducing silicon content can be efficiently achieved.