Recebido em 27/10/09; aceito em 26/4/10; publicado na web em 9/8/10The anode and the internal paste of spent Zn-C and alkaline batteries were leached with 2 mol L -1 H 2 SO 4 at 80 o C for 2 h. Solid/liquid ratio was 1/10 (g mL -1 ). The leachate was treated with Na 2 S in order to precipitate Hg, Cd and Pb. Zn was quantitatively isolated at pH 1,5-2 by adding Na 2 S. Mn can be precipitated at pH close to 7. Na 2 S may be replaced by oxalic acid. Zn precipitated at pH around 0, whereas Mn was quantitatively recovered at pH ≥ 4. Acidity control is a critical parameter. Na 2 SO 4 and carbon are the end products.
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