酸性条件下十二胺体系中Fe^(3+)对白云母可浮性的影响

Effect of Fe^(3+) on Floatability of Muscovite in Dodecylamine System and Acidic Condition

通过单矿物试验、溶液化学计算、动电位测试、红外光谱分析以及XPS分析,研究了在酸性条件下十二胺体系中Fe^(3+)对白云母的抑制作用机理。结果表明,浓度为3×10-3mol/L的Fe^(3+)可使白云母的零电点从1.6增加到2.4。在pH=4时,随着Fe^(3+)浓度的增大,白云母动电位正向移动。十二胺在白云母表面的吸附状态为物理吸附。Fe^(3+)在白云母表面产生静电吸附,并以Fe(OH)_3沉淀的形式罩盖在白云母表面并减少白云母表面暴露的Si原子数目,导致十二胺在白云母表面的吸附量减小从而抑制白云母的浮选行为。当Fe^(3+)的浓度为1×10-3mol/L时,可使白云母的回收率降低12%。

The inhibition mechanism of Fe^（3＋）in muscovite flotation was investigated with pure mineral flotation tests,solution chemistry analysis,zeta potential measurement,IR spectrum measurement and XPS analysis in dodecylamine system and acidic condition. The results showed that the zero potential of muscovite increased from 1. 6 to 2. 4 when the concentration of Fe^（3＋）was 3 × 10^（-3）mol / L. It was found that zeta potential of muscovite shifted towards the positive direction with the increasing concentration of Fe^（3＋）in p H value of 4. Dodecylamine was physical adsorption and Fe^（3＋）was the electrostatic adsorption on the surface of muscovite. the decrease of visible Si caused by Fe（OH）_3 over the surface of muscovite,which lowed the adsorption capacity of dodecylamine on the surface of muscovite,likewise,produced inhibition in muscovite flotation. When the concentration of Fe^（3＋）was 1 × 10-3mol / L,the recovery rate declined 12%.