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Etude et caractérisation de carboxylates métalliques : application à la séparation sélective

Abstract : Industrial wastes were more and more recycled because of the increase of metals prices associated to the cost of waste burying. The laboratoire d?Electrochimie des Matériaux showed the feasibility of selective precipitation using sodium carboxylates. Sodium carboxylates came from linear and saturated carboxylic acid product of natural origin (vegetable oil and animal fats). In order to use sodium carboxylates for selective precipitation, it was necessary to characterize metallic carboxylates. Few thermodynamic data are in the literature. The most important constants are solubility and thermal comportment: the first was used for the selective separation itself and the second for the valorisation of some precipitate. This work gathered obtained results for metallic carboxylates resulting from the precipitation of 11 cations (Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe2+, Fe3+, Mn2+, Ni2+, Pb2+ and Zn2+) with 4 sodium carboxylates (heptanoate, octanoate, nonanoate and decanoate). Before characterization, a chemical analyse and XRD were performed on each solid to determine their natures. The superimposing of solubility curves gives a tool allowing predicting the feasibility of a separation from a theoretical point of view. We studied the possibility to separate nickel and cadmium using sodium decanoate. This mixture corresponds to a real industrial problem (leaching of nickel/cadmium batteries). Precipitation was performed on synthetics solutions then on a real leaching. Another reagent was also studied: calcium décanoate which are solid at room temperature
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Stéphanie Mauchauffee. Etude et caractérisation de carboxylates métalliques : application à la séparation sélective. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ009S⟩. ⟨tel-01749025⟩

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