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    Rapid global technological development has led to the rising production of electronic waste that presents both challenges and opportunities in its recycling. In this review we highlight the value of metal resources in the printed circuit boards (PCBs) commonly found in end-of-life electronics the differences betw 2020 Reviews in RSC Advances

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    electronic waste is dependent on the age of the device the thickness of gold contacts halved from ca. 1.0 mm in devices manufactured in the 1980s to 0.6–0.3 mm for those made in the 2000 s.11 Pre-separation treatment of e-waste The processing of e-waste typically begins with a manually intensive dismantling phase during which circuit-board

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     · Recovery of Gold Silver Palladium and Copper from Waste Printed Circuit Boards E Place Amount of waste in million tons (type) Year of Survey Surveying Organization Globally 20-50 (e-waste) 2006 UN 3 USA 2.37 (electronic) 2009 EPA 4 Europe 8.3-9.1 (e-waste) 2005 WEEE 5

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     · Brazilian Journal of Chemical Engineering Vol. 35 No. 03 pp. JulySeptember 2018 Gold Recovery from Printed Circuit Boards of Mobile Phones Scraps Using a Leaching Solution Alternative to Cyanide 933

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     · The precious metal gold was highly leached out by F. casuarinae than Frankia sp.. The valuable metal copper was significantly increased by Frankia sp. than F. casuarinae. Higher gold recovery at 75 was obtained for F. casuarinae and copper 94 recovery by Frankia sp. bioleaching of the biooxidised e-waste at 0.2 low pulp densities.

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    deposit was 25 mg/L. The purity rate of the final deposit was 83.9 and the final gold recovery yielded 82.3 . Conclusion The results of this study indicated there is a potential for extracting a high percentage of precious metals from e-wastes without solvent. Keywords E-waste Gold extraction Hydrometallurgical method

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