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     · A novel hydrometallurgical process was proposed for selective recovery of Cu, Ag, Au and Pd from waste printed circuit boards (PCBs). More than 99% of copper content was dissolved by using two consecutive sulfuric acid leaching steps in the presence of H 2 O 2 as oxidizing agents. The solid residue of 2nd leaching step was treated by acidic thiourea in the presence of ferric iron as oxidizing

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     · 1. Introduction. Growing demand for gold and high market prices motivate the development of technologies to recover the precious metal from secondary sources, like scrap (electronic, jewelry, dental), industry waste (spent catalyst, alloy scraps, copper anode slime, mine tailing), and seawater .To put into perspective how realistic it is to consider gold recovery and recycling as a future

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