Les carboxylates de sodium : réactifs de précipitation sélective des cations métalliques contenus dans les effluents liquides

Abstract : Each year in France, the treatment of liquid waste coming from surface finishing industry generates about 200.000 tons of metallic hydroxide sludge. According to the law 92-646 of 13/07/1992 concerning ultimate waste, these sludge could not be stored in specialized landfill. The purpose of this work is to propose an alternative solution to avoid global precipitation of metals using sodium carboxylates. These reagents allow to perform selective precipitation with a goal of recycling. At first, preparation and control of carboxylate solutions were studied. Then, different metallic carboxylates were prepared and characterized. Solubility studies of these metallic compounds showed the feasibility of selective precipitation which was applied to different mixtures of cations (Fe3+-Zn2+, Fe3+-Cr3+ and Zn2+-Ni2+). The results clearly show that the use of sodium carboxylate solutions led to a rate of precipitation of metals higher than 99,6 % with a real selectivity for all mixtures studied. In each case, the products obtained can be recycled in mettalurgical industry
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Franck René Pénéliau. Les carboxylates de sodium : réactifs de précipitation sélective des cations métalliques contenus dans les effluents liquides. Autre. Université Paul Verlaine - Metz, 2003. Français. ⟨NNT : 2003METZ026S⟩. ⟨tel-01749811⟩

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