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A new environmentally friendly process for the recovery of gold from electronic waste

机译：从电子废物中回收金的新环保工艺

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摘要

A new method for the recovery of precious metals, in particular gold, from electronic waste is proposed. This work focused on the research of an easily renewable etching agent, in order to make an environmentally friendly process possible. Two well known hydrometallurgical etching agents, FeCl3 and CuCl2, were evaluated in terms of efficiency and kinetics, testing solutions with different concentration of etchant and hydrochloric acid. The recovery of spent etching solutions was evaluated: promising results were found in the case of CuCl2, which can be completely restored by oxidation of the cuprous chloride formed during the etching using atmospheric oxygen.
机译：提出了一种从电子废物中回收贵金属特别是金的新方法。这项工作的重点是研究易于再生的蚀刻剂，以使环保工艺成为可能。根据效率和动力学评估了两种众所周知的湿法冶金蚀刻剂FeCl3和CuCl2，测试了不同浓度的蚀刻剂和盐酸溶液。评估了废蚀刻溶液的回收率：在CuCl2的情况下发现了可喜的结果，通过使用大气氧蚀刻过程中形成的氯化亚铜的氧化可以完全恢复该效果。

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