Zeytuncu B.

PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING, vol.52, no.1, pp.437-450, 2016 (SCI-Expanded) identifier identifier


In this paper, recovery of manganese and zinc from alkaline battery paste by leaching under atmospheric condition using elemental sulfur as a reductive agent and sulfuric acid was investigated. Different dissolution parameters, acid concentrations, liquid-to-solid ratios, reaction temperatures, leaching times and amounts of elemental sulfur were studied in detail. According to results, the Mn dissolution in reductive acidic media was an intermediate-controlled process with activation energy of 10.21 +/- 2.60 kJ/mol. After the leaching step, Mn and Zn were selectively precipitated from the leaching solution using sodium hydroxide. After solid/liquid separation, manganese(II,III) oxide (Mn3O4) was obtained by drying at 105 degrees C in air. Next, Mn3O4 was converted to manganese(IV) oxide (MnO2) by heating at 800 degrees C in air. After that the solution containing Zn(OH)(4)(2-) was treated with sulfuric acid to form zinc hydroxide, separated and next converted to zinc oxide by heating at 600 degrees C in air. The final products were characterized by XRD. The results showed that the proposed process can be effectively used for recovery of Mn and Zn from alkaline batteries.