金属离子对微细粒锡石浮选行为的影响

Effect of Metal Ions on Floatation Behaviors of Fine Cassiterite

本文进行了一系列锡石单矿物试验来探究Fe^(3+)、Cu^(2+)、Pb^(2+)、Mg^(2+)四种金属离子对油酸钠体系中锡石浮选行为的影响,结果表明在p H=2~12范围内Fe^(3+)、Cu^(2+)、Mg^(2+)对锡石具有抑制作用;在p H=2~7.5范围内Pb^(2+)对锡石具有活化效果,在p H=7.5~12范围内Pb^(2+)对锡石也具有抑制作用。接触角检测表明,Fe^(3+)、Cu^(2+)、Mg^(2+)可以阻碍油酸阴离子在锡石表面的吸附,而Pb^(2+)可以增大锡石表面的疏水性。对Fe^(3+)的溶液化学分析显示,在p H=2~3和p H=3~12范围内抑制锡石的主要组分分别是Fe^(3+)和Fe(OH)3(s)。对Pb^(2+)的溶液化学分析显示,在p H=2~7.5范围内Pb^(2+)和Pb OH+在锡石表面的吸附使锡石表面活性增加,从而对锡石实现活化。

Some single mineral experiments were carried out to study theeffects of Fe3＋, Cu2＋, Pb2＋, Mg2＋ on thefloatation behaviors of fine cassiterite with sodium oleate as a collector. The results demonstrated that the three metalions Fe3＋, Cu2＋, Mg2＋ could reduce the recovery of cassiterite during the pH range from 2 to 12. Pb2＋ had a positiveeffect on the flotation of cassiterite when the pH was 2 - 7.5, but a negative effect when the pH was 7.5 - 12. Con-tact angle measurements indicated that Fe3＋, Cu2＋ ,Mg2＋hindered sodium oleate from adsorbing onto the surfaces ofcassiterite and Pb2＋ enhanced the hydrophobicity of cassiterite. The solution chemistry analysis revealed that themain components that acted as depressants in Fe3＋ solution were Fe3＋ and Fe （OH）3＋s）when pH was 2 -3 and pHwas 3 - 12, respectively. And in Pb2＋ solution, Pb2＋ and PbOH＋ were the main components that activated cassiterite.