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Advances in recovering noble metals from waste printed circuit boards (WPCBs)

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Abstract
An extensive investigation on the noble metal (NM) content in different classes of waste printed circuit boards (WPCBs: random access memories, RAMs; network interface controllers, NICs; motherboards; TV, DVD/CD player, hard-drive, and mobile phone PCBs) has been performed to define the most appropriate case study and provide a robust database useful for workers in the waste valorization field. Following accurate selection, mechanical comminution, representative sampling, quantitative digestion, and analytical characterization (ICP-AES), RAMs and mobile phone PCBs confirmed to be the "richest" source, while TV PCBs are the "poorest" one in term of NM content. Accordingly, the RAM case study has been employed for the application of a new NMs recovery method, previously set up on finely comminuted waste electric and electronic equipment underwent materials enrichment by mechanical separation. Despite the very large amount of vitreous-plastic and metallic materials present in the mixture, satisfactory NM recovery yields (Cu 70%, Ag 92%, Au 64%) with limited byproduct formation have been obtained using safe and recyclable reagents in mild conditions: citric acid for base metal leaching, ammonia in oxidizing environment for Cu and Ag separation and recovery, triiodide aqueous solution for gold recovery, at room pressure, and 25-100 degrees C. The reported results provide useful quantitative parameters for assessing the profitability of an industrial scale-up of the new sustainable NMs recovery method.
Keywords
Hydrometallurgy, WPCBs, Noble metals, Recycling, Green chemistry, Iodine, PRECIOUS METALS, GOLD

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MLA
Rigoldi, Americo, et al. “Advances in Recovering Noble Metals from Waste Printed Circuit Boards (WPCBs).” ACS SUSTAINABLE CHEMISTRY & ENGINEERING, vol. 7, no. 1, 2019, pp. 1308–17.
APA
Rigoldi, A., Trogu, E. F., Marcheselli, G. C., Artizzu, F., Picone, N., Colledani, M., … Serpe, A. (2019). Advances in recovering noble metals from waste printed circuit boards (WPCBs). ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 7(1), 1308–1317.
Chicago author-date
Rigoldi, Americo, Emanuele Filiberto Trogu, Gian Carlo Marcheselli, Flavia Artizzu, Nicoletta Picone, Marcello Colledani, Paola Deplano, and Angela Serpe. 2019. “Advances in Recovering Noble Metals from Waste Printed Circuit Boards (WPCBs).” ACS SUSTAINABLE CHEMISTRY & ENGINEERING 7 (1): 1308–17.
Chicago author-date (all authors)
Rigoldi, Americo, Emanuele Filiberto Trogu, Gian Carlo Marcheselli, Flavia Artizzu, Nicoletta Picone, Marcello Colledani, Paola Deplano, and Angela Serpe. 2019. “Advances in Recovering Noble Metals from Waste Printed Circuit Boards (WPCBs).” ACS SUSTAINABLE CHEMISTRY & ENGINEERING 7 (1): 1308–1317.
Vancouver
1.
Rigoldi A, Trogu EF, Marcheselli GC, Artizzu F, Picone N, Colledani M, et al. Advances in recovering noble metals from waste printed circuit boards (WPCBs). ACS SUSTAINABLE CHEMISTRY & ENGINEERING. 2019;7(1):1308–17.
IEEE
[1]
A. Rigoldi et al., “Advances in recovering noble metals from waste printed circuit boards (WPCBs),” ACS SUSTAINABLE CHEMISTRY & ENGINEERING, vol. 7, no. 1, pp. 1308–1317, 2019.
@article{8636607,
  abstract     = {An extensive investigation on the noble metal (NM) content in different classes of waste printed circuit boards (WPCBs: random access memories, RAMs; network interface controllers, NICs; motherboards; TV, DVD/CD player, hard-drive, and mobile phone PCBs) has been performed to define the most appropriate case study and provide a robust database useful for workers in the waste valorization field. Following accurate selection, mechanical comminution, representative sampling, quantitative digestion, and analytical characterization (ICP-AES), RAMs and mobile phone PCBs confirmed to be the "richest" source, while TV PCBs are the "poorest" one in term of NM content. Accordingly, the RAM case study has been employed for the application of a new NMs recovery method, previously set up on finely comminuted waste electric and electronic equipment underwent materials enrichment by mechanical separation. Despite the very large amount of vitreous-plastic and metallic materials present in the mixture, satisfactory NM recovery yields (Cu 70%, Ag 92%, Au 64%) with limited byproduct formation have been obtained using safe and recyclable reagents in mild conditions: citric acid for base metal leaching, ammonia in oxidizing environment for Cu and Ag separation and recovery, triiodide aqueous solution for gold recovery, at room pressure, and 25-100 degrees C. The reported results provide useful quantitative parameters for assessing the profitability of an industrial scale-up of the new sustainable NMs recovery method.},
  author       = {Rigoldi, Americo and Trogu, Emanuele Filiberto and Marcheselli, Gian Carlo and Artizzu, Flavia and Picone, Nicoletta and Colledani, Marcello and Deplano, Paola and Serpe, Angela},
  issn         = {2168-0485},
  journal      = {ACS SUSTAINABLE CHEMISTRY & ENGINEERING},
  keywords     = {Hydrometallurgy,WPCBs,Noble metals,Recycling,Green chemistry,Iodine,PRECIOUS METALS,GOLD},
  language     = {eng},
  number       = {1},
  pages        = {1308--1317},
  title        = {Advances in recovering noble metals from waste printed circuit boards (WPCBs)},
  url          = {http://dx.doi.org/10.1021/acssuschemeng.8b04983},
  volume       = {7},
  year         = {2019},
}

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