PhD Student (M/F): Characterization and Optimization of Uranium-Bearing Black Shale Valorization

Job Description

Thesis Subject

Within the framework of the CREGU LabCOM, developed in partnership between Orano Mining and the GeoRessources laboratory (University of Lorraine-CNRS), we are recruiting a PhD student to develop new strategies for the valorization of Black Shales, a resource with significant potential for uranium and associated metals.

The valorization of these ores represents a major scientific challenge due to their complex mineralogy and the physicochemical mechanisms involved in their processing. A better understanding of these mechanisms is essential to develop more efficient recovery processes adapted to this type of ore.

The main objective of this PhD thesis is to investigate the leaching mechanisms of Black Shales in order to optimize the recovery of uranium and associated metals. Particular attention will be paid to the influence of the ore's mineralogical characteristics, dissolution kinetics, and the impact of agglomeration on leaching performance. The research will combine advanced material characterization, laboratory-scale leaching experiments, and column tests representative of industrial processes.

### Duties and Responsibilities

The PhD student will contribute to a range of experimental and analytical activities, including:

* Mineralogical and chemical characterization of Black Shales to identify the phases hosting uranium and associated metals;
* Design and implementation of laboratory-scale leaching experiments to investigate dissolution mechanisms and assess extraction performance;
* Investigation of the influence of the main operating parameters (leaching agent, concentration, temperature, contact time, particle size, solid-to-liquid ratio, etc.) on extraction yields and leaching kinetics;
* Implementation of agglomeration and column leaching tests to assess the influence of the ore's physical properties on solution percolation, mass transfer, and process performance;
* Characterization of solid residues and leach solutions to improve the understanding of the geochemical mechanisms governing the dissolution of target elements;
* Collaboration with Orano's research and development teams and academic partners to facilitate the transfer of knowledge towards industrial applications.

Your Work Environment

The PhD thesis will be carried out primarily at Orano Mining's Centre for Innovation in Extractive Metallurgy (CIME) in Bessines-sur-Gartempe, with regular interactions with the GeoRessources laboratory. The PhD student will benefit from a research environment combining academic and industrial expertise, as well as access to dedicated experimental facilities for materials characterization and hydrometallurgical processes.

This project offers the opportunity to contribute to the development of new scientific knowledge on the valorization of Black Shales while addressing industrial challenges related to the sustainable recovery of uranium and associated metals.

Compensation and benefits

Compensation

2300 € gross monthly

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

The research professions