Selective recovery of gold from waste mobile phone PCBs by hydrometallurgical process

Urban Mining and Electrochemistry: Cyclic Voltammetry Study of Acidic Solutions from Electronic Wastes (Printed Circuit Boards) for Recovery of Cu, Zn, and Ni

“…Every year, the amount of discarded computer equipment around the world increases [25], which triggers the exponential growth of the "e-waste", including PCBs, so it is necessary to accelerate the research to develop an optimal process for the recovery of the PCBs, which can be environmentally friendly, compatible with hydrometallurgical processes and more cost-efficient, and which involves the use of sulfuric acid and oxygen, in comparison with those implicating the use of nitric acid, hydrochloric acid, peroxides and even aqua regia, as they are potential sources of pollution and health risks [26]. An optimum mechanism for the recovery of metal products is to submit them to the process of acid leaching using oxygen and sulfuric acid (pH 1.5) to dissolve the copper, nickel and zinc, with later gold retrieval [11,12,27].…”

Direct extraction of palladium and silver from waste printed circuit boards powder by supercritical fluids oxidation-extraction process

“…The major economic driving force for recycling waste PCBs is the value of their precious metal components, accounting for around 50% of their value [15]. For recovering precious metals from waste PCBs, hydrometallurgical technologies, such as metal leaching [16,17], solvent extraction [18], ion-exchange [19] and electrochemistry [20], have a variety of benefits over pyrometallurgy due to its low dust generation, easy working conditions, and low energy consumption, but it has a number of shortcomings (e.g. requiring large amount of industrial water and resulting in lots of waste liquor, etc.).…”

Selective recovery of palladium from waste printed circuit boards by a novel non-acid process

“…In recent years, the most active research area on recovery of metals from waste PCBs is hydrometallurgical techniques [2,[4][5][6][7].…”

“…However, most of those studies focused on the recovery of copper, silver, gold and other base metals [2,[8][9][10][11][12][13][14][15][16]. Very few researches have been carried out on the recovery of palladium [6,[17][18][19].…”