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Behaviour of zinc during the process of leaching copper from WPCBs by typical acidic ionic liquids

机译：典型的酸性离子液体从WPCB中浸出铜的过程中锌的行为

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摘要

Waste printed circuit boards (WPCBs) have attracted more and more attention, which is mainly focused on the recovery of valuable metals, especially copper. Few studies have been reported on the behaviour of heavy metals during the process of recycling copper from WPCBs. Hence, we selected zinc to represent the heavy metals and examined its behaviour in a typical acidic ionic liquid (IL) leaching system. The factors that affect the zinc leaching rate, such as particle size, temperature, ionic liquid concentration, volume of H2O2 added and solid to liquid ratio, were examined in detail. The result showed that zinc could be leached out successfully in five typical acidic ILs and the zinc leaching rate was significantly impacted by the volume of H2O2 added, solid to liquid ratio and temperature. In addition, the zinc leaching rate by [BSO(3)HMIm]OTf was almost the same as [BSO3HPy]OTf. Moreover, the acidic IL with CF3SO3- was less efficient than the acidic IL with HSO4-. Although zinc could restrain the leaching of copper because of the substitution reaction between metallic zinc and Cu2+, the two show almost the same tendency. The results of the zinc leaching kinetics analysis indicated that diffusion played a more important role than the surface reaction, which was the same as copper, but different from inorganic acids, which are usually controlled by the surface reaction.
机译：废印刷电路板（WPCB）引起了越来越多的关注，主要集中在有价金属尤其是铜的回收上。从WPCB回收铜的过程中，鲜有关于重金属行为的研究报道。因此，我们选择锌代表重金属，并研究了其在典型的酸性离子液体（IL）浸出系统中的行为。详细研究了影响锌浸出率的因素，例如粒径，温度，离子液体浓度，H2O2的添加量和固液比。结果表明，锌可以在5种典型的酸性离子液体中成功浸出，并且浸出量受过氧化氢体积，固液比和温度的影响显着。另外，[BSO（3）HMIm] OTf的锌浸出率与[BSO3HPy] OTf几乎相同。此外，带有CF3SO3-的酸性IL比带有HSO4-的酸性IL效率低。尽管由于金属锌和Cu2 +之间的取代反应，锌可以抑制铜的浸出，但两者显示出几乎相同的趋势。锌浸出动力学分析的结果表明，扩散起的作用比表面反应更重要，后者与铜相同，但不同于通常由表面反应控制的无机酸。

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