Recycling-oriented methodology to sample and characterize the metal composition of waste Printed Circuit Boards

Agathe Hubau (1) , Alexandre Chagnes (2) , Michel Minier (3) , Solène Touzé (1) , Simon Chapron (4) , Anne-Gwenaëlle Guezennec (1)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 LPCS - Laboratoire de Physico-Chimie des Surfaces
3 Laboratoire Charles Friedel
4 ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule

As spent printed circuit boards (PCBs) are among the most valuable components in waste electrical and electronic equipment (WEEE), their recovery makes economic and strategic sense. However, their composition varies considerably depending on the location, year and type of appliance in which they were used. Developing new treatment processes requires representative sampling of spent PCBs from large samples and accurate determination of their raw material composition. This study aimed to characterize spent PCBs by milling, sampling and leaching with an appropriate reagent. Sampling was performed on 526 kg of spent PCBs, to obtain different samples milled at 750 µm in order to access the metals. The samples were leached with aqua regia and the metal contents of the leachates were determined. For most metals, the analyses of 40 g-samples of spent PCBs showed limited variation in the composition of the different samples. These results concurred well with other studies reported in the literature.

Domaines: Sciences de l'ingénieur [physics]; Génie des procédés; Sciences de l'environnement; Sciences de l'environnement; Ingénierie de l'environnement

Agathe Hubau, Alexandre Chagnes, Michel Minier, Solène Touzé, Simon Chapron, et al.. Recycling-oriented methodology to sample and characterize the metal composition of waste Printed Circuit Boards. Waste Management, 2019, 91, pp.62-71. ⟨10.1016/j.wasman.2019.04.041⟩. ⟨hal-02161758⟩