This paper reports on the selective separation and recovery of gold ions from leachates of discarded mobile phones using liquid-liquid extraction and a polymer inclusion membrane (PIM) transport system. The collected mobile phones were crushed by a mill and the obtained powder was calcinated. After leaching with aqua regia, the metal composition of the leachate was analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES). The analysis results confirmed that the mobile phone waste contained 397 g/ton of gold. Liquid-liquid extraction and PIM-based separation procedures for the selective recovery of gold(III) from synthetic and actual leachates were developed. The extracting organic solution and the PIM incorporated the newly synthesized extractant N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]glycine (D2EHAG) which exhibited high selectivity for the gold(III) ion over the other metal ions present in much higher concentrations in the leachates. The compositions of the feed and receiving solutions in both the liquid-liquid and PIM based extraction and back-extraction of the gold(III) ions were optimized. It was established that optimal extraction required a HCl concentration in the feed solution of 2 mol/L and that a receiving solution containing 0.1 M thiourea in 1 M HCl was capable of back-extracting gold(III) quantitatively. Membrane transport experiments with a synthetic leachate as the feed solution demonstrated that 96% of the gold(III) ions was selectively transported into the receiving solution of the transport cell thus leaving all other metal ions in the leachate.

本文报道了使用液-液萃取和聚合物包裹膜（PIM）传输系统从废弃手机的浸出液中选择性分离和回收金离子的方法。将收集的手机用粉碎机粉碎，将得到的粉末煅烧。用王水浸出后，通过电感耦合等离子体原子发射光谱法（ICP-AES）分析渗滤液的金属成分。分析结果证实，手机废料中含金397克/吨。开发了液-液萃取和基于PIM的分离程序，用于从合成渗滤液和实际渗滤液中选择性回收金（III）。萃取有机溶液和PIM掺入了新合成的萃取剂N- [ N，N-二（2-乙基己基）氨基羰基甲基]甘氨酸（D2EHAG），它对金（III）离子具有比其他金属离子高的选择性，在浸出液中浓度较高。优化了基于液-液和PIM的金（III）离子萃取和反萃取中进料和接收溶液的成分。已确定最佳萃取要求进料溶液中的HCl浓度为2 mol / L，并且在1 M HCl中含有0.1 M硫脲的接收溶液能够定量反萃取金（III）。使用合成渗滤液作为进料溶液的膜运输实验表明，96％的金（III）离子被选择性地运输到运输池的接收溶液中，从而将所有其他金属离子保留在渗滤液中。