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Etude physicochimique de nouveaux agents d’extraction pour la récupération du cobalt, du nickel et du manganèse en milieu chlorure par extraction liquide-liquide

Abstract : Cobalt and nickel are strategic metals from many applications including alloys manufacturing, electrode materials for lithium-ion batteries (LIBs), etc. Their recovery from spent materials is a good opportunity from economical and geopolitical viewpoints as these metals are expensive and recycling reduces considerably supply risks of cobalt and nickel, particularly in the forthcoming years during which cobalt and nickel demands will likely increase significantly with the emergence of electric vehicles. Therefore, recovery of cobalt and nickel from LiBs is strategic and development of efficient and economic processes is coming to the fore. Several research activities were carried out to recycle strategic metals from spent batteries by different methods such as pyrometallurgy, hydrometallurgy and biohydrometallurgy. Pyrometallurgical processes are however energy intensive and release gases like sulfur dioxide and carbon dioxide which are harmful to the environment. In recent past, metallurgical industry has been searching for hydrometallurgical processes due to some advantages such as possibility of treating low-grade resources, easier control of wastes and lower energy consumption. Hydrometallurgical processes are based on physical separation, leaching, purification, precipitation and in some cases electrowining. The demand for high purity metals and recent trends towards environmentally friendly technology has focused more attention onto solvent extraction because this technology is mature and permits to achieve high extraction efficiency at low operating costs. Cyanex 272 is a dialkyl phosphinic acid extractant widely used for the separation of cobalt from nickel to obtain high purity cobalt salts that can be reused to produce high-grade products for lithium-ion batteries. However, extraction occurs at pH close to 4 for cobalt and 6 for nickel and addition of alkaline solutions to adjust the pH is required. In order to decrease operating expenditure, the use of extracting agents capable to recover and separate cobalt, nickel, lithium and manganese at lower pH and in few stages is mandatory. The aim of this work is to study the influence of the chemical structure of various organophosphorus compounds synthesized at the laboratory scale on the extraction efficiency of cobalt and nickel vs. pH. In particular, the influence of branching, hydrophobicity and the presence of oxygen atoms in alkyl chains has been investigated for several organophosphorus compounds such as bis(1,3-dibutoxypropan-2-yl) phosphoric acid, bis(1,3-diisobutoxypropan-2-yl) phosphoric acid, bis(5,8,12,15-tetraoxanonadecan-10-yl) phosphoric acid and bis(undecan-6-yl) phosphoric acid.
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Submitted on : Monday, April 6, 2020 - 3:47:10 PM
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Kateryna Omelchuk. Etude physicochimique de nouveaux agents d’extraction pour la récupération du cobalt, du nickel et du manganèse en milieu chlorure par extraction liquide-liquide. Chimie théorique et/ou physique. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEC003⟩. ⟨tel-02533705⟩



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