Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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The solubilization of used batteries components is of great scientific and economic interest, on account of recycling requirement of these wastes and recovery of valuable materials. In this paper, the recovery of zinc and manganese from Zn-ZnCl₂-MnO₂ (Zn-carbon) spent batteries was studied through chemical and electrochemical acid leaching experiments. Experimental parameters, such as acid concentration, solid: liquid ratio (S: L), temperature, time and current intensity were studied related to the dissolution of the black powder of the Zn-MnO₂ batteries. Leaching tests were carried out using H₂SO₄, in order to maximize zinc extraction and minimize Mn and Fe extraction. The best conditions for acid leaching (98 % of Zn, 24 % of Mn and 18 % of Fe) were obtained with 2 M H₂SO₄, S: L= 1:5, room temperature and 1 hour leaching time. The results of electrochemical experiments showed selective leaching of Zn, together with a good recovery of metallic Zn (99.99% purity) at the cathode.

Keywords: environmental protection, recycling, Zn–carbon batteries, chemical /electrochemical leaching