矿浆中金属离子对蓝晶石矿物浮选行为的影响

通过蓝晶石、石英及黑云母的浮选实验，研究了金属离子对矿物浮选行为的影响.实验结果表明:Ca²⁺和Mg²⁺显著活化蓝晶石的浮选，Al³⁺及Fe³⁺对蓝晶石及石英表现很强的抑制作用.浮选溶液化学分析表明，Fe³⁺，Al³⁺可以在矿物表面生成Fe(OH)₃和Al(OH)₃，使矿物浮选受到强烈的抑制；Ca²⁺和Mg²⁺由于羟基络合物存在使蓝晶石的零电点向低pH方向发生漂移，使十二胺的静电吸附力增强，起到活化作用.根据波耳兹曼矢量场中的粒子分布理论，通过计算Fe³⁺对矿物作用前后在不同pH条件下液相内部胺离子(RNH⁺₃)浓度、界面层胺离子的浓度以及比例关系来分析金属离子的活化或抑制作用机理.

Influence of Metal Ions in Pulp on Floatability of Kyanite Minerals

The influences of metal ions on floatability of kyanite， quartz and biotite were studied by flotation tests. The test results showed that Ca²⁺ and Mg²⁺ have significant activation of kyanite flotation， while Al³⁺ and Fe³⁺ have strong depression of quartz and kyanite flotation. The analysis results of flotation solution chemistry showed that the flotation of kyanite and quartz are depressed intensively owing to the generation of corresponding hydroxide precipitations of A1³⁺ and Fe³⁺. The electrostatic interaction is contributing to strengthen the adsorption of minerals and dodecylamine when the zeta potential of kyanite shift markedly towards negative direction in the presence of corresponding hydroxy complex of Ca²⁺ and Mg²⁺， so flotation of kyanite can be activated. According to particle distribution theory in Boltzmann vector field， activation or depression mechanism of metal ions were analyzed by calculating amine ion(RNH⁺₃) concentration in liquid phase interior， the interface layer and their ratio under different pH value conditions before and after Fe⁺₃ effect on minerals.