从含锡电子废料中回收镀层金的研究

某电子废料含铜、锡和镍等成分，表面镀层金属为金，研究了从其中回收镀层金的方法。对电子废料进行拆卸和清洗，分拣出金属件，并向该金属件中加入浓硝酸溶液进行反应，过滤得到滤渣并洗涤至中性；再次向该滤渣中加入浓盐酸溶液并加热，当溶液变澄清后进行过滤、洗涤，经干燥得到金箔。镀层金回收率>99%，回收得到的金箔纯度>99%。

Research on the Au Recovery from Sn-containing Electronic Waste

The method of recovering Au from the electronic waste is studied in this paper which containing Cu, Sn and Ni and Au coated on the surface. Disassembling and cleaning the electronic waste, sorting out the metal parts, and then adding concentrated nitric acid solution to the metal parts for reaction, filtering to obtain filter residue and washing to neutral. Then the concentrated hydrochloric acid solution is added to the filter residue and heated. When the solution becomes clear, it is filtered and washed, and dried to obtain Au foil. The Au recovery rate is more than 99%, the recovered Au foil purity is more than 99%.