Laurent Cassayre is CNRS Research Director at the Laboratoire de Génie Chimique in Toulouse. He holds a PhD in Process Engineering from the University of Toulouse (2005) and an Habilitation to Supervise Research from the Institut National Polytechnique de Toulouse (2015). His areas of interest include pyrometallurgy (high-temperature electrochemical processes) and hydrometallurgical processes, with applications in metal recycling and recovery. Its current scientific activities focus on the problems associated with the calculation of thermodynamic equilibria, and the contribution that this type of approach can make to the understanding, implementation, and optimisation of hydrometallurgical processes. He has been the director of the GDR PROMETHEE since 2022.

Hervé Muhr is CNRS Research Director at the Laboratoire Réactions et Génie des Procédés in Nancy. He obtained his PhD in Chemical Engineering in 1993 and an Habilitation to Supervise Research from the Institut National Polytechnique de Lorraine in 2000. He is a specialist in precipitation and crystallization processes, which are major unit operations in hydrometallurgy. His current scientific activities focus on the recycling of Li-ion batteries and electronic cards for optimal metal recovery. He has been the deputy director of the GDR PROMETHEE since 2022.