常见金属离子对白云母和石英浮选特性的影响

为给白云母和石英浮选分离提供理论基础，在Ca2+、Mg2+、Fe3+、Al3+作用下，分别考察了十二胺和油酸钠作捕收剂时，纯矿物白云母和石英的浮选特性，并测定了其Zeta电位。试验结果表明:（1）金属离子能够提升白云母、石英表面的Zeta电位，从而影响捕收剂在矿物表面上的吸附；（2）十二胺作捕收剂时，Ca2+、Mg2+能提高矿物Zeta电位而减弱十二胺的静电吸附强度，抑制二者上浮；Fe3+、Al3+在矿浆pH=4~6时，可使白云母、石英表面Zeta电位由负变正，极大地削弱十二胺的吸附，抑制浮选；（3）油酸钠作捕收剂时，金属离子均能活化白云母、石英浮选，且金属离子价态越高，活化作用越强；碱性越强，活化作用越明显；Ca2+、Mg2+在强碱性条件下活化作用极强，远强于Al3+、Fe3+。 

Effect of Common Metal Ions on the Flotation Performance of Muscovite and Quartz

In order to provide theoretical basis for the flotation separation of muscovite and quartz, the flotation performance and Zeta potentials of pure muscovite and quartz were investigated using dodecylamine and sodium oleate in the presence of Ca2+, Mg2+, Fe3+ and Al3+.The results indicated that metal ions could increase the Zeta potential of muscovite and quartz, which affected the adsorption between collectors and minerals. When using dodecylamine as the collector, Ca2+ and Mg2+ could increase the Zeta potential of both minerals, which decreased the electrostatic adsorption strength and depressed their flotation. Fe3+ and Al3+ could change make the Zeta potential of both minerals from negative to positive at pH=4-6, which greatly hindered the electrostatic adsorption between minerals and collector. When using sodium oleate as the collector, metal ions could activate the flotation of both minerals. The activation was more obvious with higher ion valences and higher pH values. Ca2+ and Mg2+ showed a more intense activation effect than Al3+ and Fe3+ in strong alkaline conditions.