磁种团聚对细粒矿物浮选的影响（英文）

Effect of magnetic seeding agglomeration on flotation of fine minerals

磁种团聚(MSA),即通过向浮选矿浆中引入磁种和低强度预磁场,使细粒矿物发生团聚,然后将该团聚应用到煤泥、黄铁矿及赤铁矿细泥浮选中。通过粒度分析和浮选试验发现,磁种团聚提高了细粒浮选的回收率和黄铁矿矿泥的浮选速率,但对浮选选择性造成了一定损失;在聚丙烯酰胺和淀粉分别存在条件下,煤泥和赤铁矿细泥的团聚浮选皆得到了增强,磁种与絮凝剂之间存在着协同作用。机理分析和计算证实了磁种在矿物表面发生了吸附,该吸附降低了细粒磁种团聚所需要的临界磁场强度。原子力测试表明磁种与矿物颗粒间存在着一种长程作用力,该作用力有利于磁种在矿物颗粒上的吸附。红外分析表明,聚丙烯酰胺和淀粉在矿物和磁种表面皆发生了吸附,起到了桥联作用,强化了矿物粒子间的团聚。探讨了磁种团聚的表面特征(SEM)和吸附模型。

Magnetic seeding agglomeration(MSA),i.e.,adding magnetic seeds and a low intensity pre-magnetization for fine agglomeration,was applied to the flotation of coal,pyrite and hematite ore slimes.Size analysis and flotation tests highlight that the MSA improved flotation recovery and kinetics of pyrite ore while causing some loss in selectivity,and in the presences of the polyacrylamide for coal and starch for hematite the agglomeration flotation was further strengthened due to the synergetic effect between the flocculants and magnetic seeds.Magnetism analyses and calculation confirmed the adsorption of magnetic seeds onto minerals,resulting in a decreased threshold magnetic field intensity for the MSA to happen.Then atomic force microscope(AFM)study found that there exists a long range force between magnetic seeds and minerals,which facilitates the adsorption of magnetic seeds on minerals.FTIR shows both the polyacrylamide and starch adsorbed onto minerals and magnetic seeds,thus acting as the bridging media between minerals and magnetic seeds,intensifying the agglomeration in flotation.Surface characterization of the MSA was understood by SEM imaging,and models of the MSA were proposed.