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\DOI{10.5802/crchim.401}
\datereceived{2025-04-18}
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%\def\cdr@specialtitle@english{GDR Prom\'eth\'ee - French Research Network on \textit{Hydrometallurgical Processes for Primary and Secondary Resources}}
%\def\cdr@specialtitle@french{GDR Prom\'eth\'ee - Groupement de Recherche sur les Proc\'ed\'es Hydrom\'etallurgiques pour la Gestion Int\'egr\'ee des Ressources Primaires ...}
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\title{Special issue on hydrometallurgical processes for the integrated management of primary
and secondary resources: Foreword}

\alttitle{Num\'ero th\'ematique sur les proc\'ed\'es hydrom\'etallurgiques pour la gestion int\'egr\'ee des ressources primaires et secondaires : Avant-propos}

\author{\firstname{Laurent} \lastname{Cassayre}\CDRorcid{0000-0001-6876-6086}}

\author{\firstname{Herv\'{e}} \lastname{Muhr}}

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\xsection{}
This special issue is the initiative of the Prom\'eth\'ee GDR, a national
research group dedicated to the study of hydrometallurgical processes
for the integrated management of primary and secondary resources. This
GDR was created in January 2016 and renewed in 2021, and brings
together around 150 research actors from 27 academic laboratories, as
well as CEA, IFPEN and BRGM teams. It contributes to structure French
research community on hydrometallurgical processes, for a better
management of non-energy mineral resources, from mining to recycling.
The CNRS, via its two institutes ``Chemistry'' and ``Engineering'', is
funding this GDR.

The community was invited to submit part of their work for this special
issue of the journal Comptes Rendus de l'Acad\'{e}mie des Sciences.
Following a standard review process, 13 of these articles have been
published, among which four review articles and nine research papers.
They cover and combine a wide range of scientific fields, from chemical
engineering, separation chemistry, electrochemistry, biometallurgy,
physical chemistry or mechano-chemistry, and address a various range of
metal elements, such as noble metals, transition metals, lithium, rare
earths, uranium and actinides. More specifically, this special issue
starts with a presentation of a specific classification process for
electronic wastes~\cite{1}. Then four articles are dedicated to
leaching and bioleaching processes~\cite{2,3,4,5}, three articles deal
with both leaching and precipitation  operations~\cite{6,7,8}, two
focus on precipitation~\cite{9,10}, two consider chemical aspects of
solvent extraction~\cite{11,12} and a last paper is dedicated to
electrometallurgy of noble metals in deep eutectic solvents~\cite{13}. 

We would like to thank all authors for their implication in this
Special Issue, as well as the {\textgreater}30 reviewers who provided
many valuable insights on these papers.

\vspace*{22pt}

\hspace*{.6cm}
\begin{xxminipage}
Laurent Cassayre\chimnewline  
Laboratoire de G\'{e}nie Chimique\chimnewline  
Toulouse\chimnewline 
France\chimnewline 
\textemail{laurent.cassayre@ensiacet.fr}
\end{xxminipage}
\vspace*{10pt}

\hspace*{.6cm}
\begin{xxminipage}
Herv\'{e} Muhr\chimnewline 
Laboratoire R\'{e}actions et G\'{e}nie des
Proc\'{e}d\'{e}s\chimnewline 
Nancy\chimnewline 
France\chimnewline 
\textemail{herve.muhr@univ-lorraine.fr}
\end{xxminipage}

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