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    STUDIA CHEMIA - Issue no. 4 / 2011  
         
  Article:   COMPARATIVE STUDY OF SOLUBILIZATION METHODS FOR ZINC AND MANGANESE RECOVERY FROM SPENT BATTERIES.

Authors:  PETRU ILEA.
 
       
         
  Abstract:  

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

 
         
     
         
         
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