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Etudes thermodynamiques de fluides complexes par un dispositif de caractérisation microfluidique intégré

Abstract : To increase the performance of our electronic components, manufacturers are using new materials such as rare earth elements (REE). Despite their name, the REE are present in quantity on Earth but in a diluted way in the ores extracted. The extraction of these elements is little carried out in Europe but mainly in Asia where the chemical processes of separations employed are sometimes not very respectful of the environment. Moreover European manufacturers are economically constrained by the Asian market for the purchase of these raw materials. On the other hand, Europe has a large quantity of electronic waste containing the elements of interest. Recycling processes are therefore essential to reduce our economic dependence and meet the needs of a circular economy. Recycling processes such as, for example, liquid-liquid extraction already exist, but the diversity of the present waste requires to adapt the process according to the batch of waste in order to improve the yield. But the optimization of a process requires experiments that can take several years. The aim of the thesis is to find innovative ways to reduce the time needed to study a liquid-liquid extraction system from a few years to a few weeks. For this the domain needs a dedicated instrumentation that can analyse processes automatically and quickly. The work of this thesis is focused on the development of a microfluidic liquid-liquid extraction device associated with two main online analysis techniques. The first analytical technique is based on an X-ray fluorescence (XRF) method to determine the extraction performance. The second method is based on Fourier transform infrared spectrometry (FTIR) in order to study the activity of solvents (aqueous and organic), informing about extraction mechanisms.
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https://tel.archives-ouvertes.fr/tel-01992088
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Submitted on : Thursday, January 24, 2019 - 11:36:21 AM
Last modification on : Thursday, May 28, 2020 - 10:25:02 AM

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  • HAL Id : tel-01992088, version 1

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Christophe Penisson. Etudes thermodynamiques de fluides complexes par un dispositif de caractérisation microfluidique intégré. Automatique / Robotique. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAT066⟩. ⟨tel-01992088⟩

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