Valorisation de boues d'électrozingage par lixiviation puis complexation et dépôt électrochimique d'alliages zinc-nickel

Abstract : This work was aimed at investigating the recovery of valuable metals eontained in sludges issued in steel plate plating factories. As a matter of fact, processes for the treatment of these wastes have to be developed, and our contribution has mainly concerned a valorisation process for zinc plating sludges. Thermodynamic calculations were carried out to determine the suitable conditions for complexation of zinc and nickel using ammonia. Leaching trials with solid samples issued from two factories, have shown the selective and efficient dissolution of both metal salts. A part of this dissertation deals with literature survey on co-deposition of zinc and nickel, together with the experimental investigation of the electrochemistry of these elements from synthetic ammonia-containing baths. In view to produce Zn-Ni alloy, numerous deposits were prepared at a rotating disk electrode and observed by electronic scanning microscopy. In spite of the promising results obtained, thermodynamic calculations of gas-liquid equilibria could show that the ammonia pressure over the electrolytic bath was high enough to hinder the further development of such process. An alternative solution to the use of ammonia was then suggested and glycine was considered through a similar approach. Zinc and nickel can be recovered with high yields from the two types of sludges by leaching using glycine. The electrolytic treatment of the leaching solutions in a discontinuous reactor showed that zinc could be deposited with satisfactory yields; in contrast, nickel deposition seems to be inhibited by glycine.
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Israël Rodriguez-Torres. Valorisation de boues d'électrozingage par lixiviation puis complexation et dépôt électrochimique d'alliages zinc-nickel. Autre. Institut National Polytechnique de Lorraine, 1999. Français. ⟨NNT : 1999INPL119N⟩. ⟨tel-01749926⟩

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