黄药体系下铅离子诱导异极矿强化硫化浮选及其机理

Lead ions induced strengthening sulfidation-flotation of hemimorphite in xanthate system and its mechanism

针对异极矿难以硫化的问题,采用铅离子(Pb2+)对其进行预先活化,研究黄药体系下的浮选行为和强化硫化机理。结果表明:与常规硫化(硫化+重金属活化)相比,添加适量Pb2+的预处理对异极矿硫化有强化作用,不但可以提高异极矿回收率,还能降低硫化钠用量,而脉石矿物石英几乎不受影响;Pb2+的活化机理表现在Pb2+可吸附在异极矿表面增加硫化活性位点,当加入硫化钠以后可迅速生成硫化铅(PbS),并对后续PbS的形成具有诱导结晶作用,使得表面生成更多的PbS晶体,从而达到强化硫化目的。

In view of the difficulty in sulfidation of hemimorphite,lead ions were used to pre-activate it.The flotation behavior and strengthening sulfidation mechanism in xanthate system were studied.The results show that,compared with conventional sulfidation(sulfidation+activation by heavy metal),the pretreatment of appropriate amount of Pb2+can strengthen the sulfidation of hemimorphite,which not only improves the recovery,but also reduces the dosages of sodium sulfide,while the gangue mineral(quartz)is almost unaffected.The activation mechanism of lead ions is as follows:lead ions can be adsorbed on the surface of hemimorphite to increase the sulfidation active sites.When sodium sulfide is added,lead sulfide can be rapidly generated which has the effect of induced crystallization for the subsequent formation of lead sulfide.Thus more PbS crystals can be formed on the surface,so as to achieve the purpose of strengthening sulfidation.