Research Article Open Access

A NEW THERMAL PROCESS FOR THE RECOVERY OF METALS FROM ZINC-CARBON AND ALKALINE SPENT BATTERIES

Girolamo Belardi1, Roberto Lavecchia2, Franco Medici2, Luigi Piga2 and Antonio Zuorro2
  • 1 , Italy
  • 2 Sapienza University, Italy
American Journal of Applied Sciences
Volume 11 No. 9, 2014, 1566-1573

DOI: https://doi.org/10.3844/ajassp.2014.1566.1573

Published On: 26 July 2014

How to Cite: Belardi, G., Lavecchia, R., Medici, F., Piga, L. & Zuorro, A. (2014). A NEW THERMAL PROCESS FOR THE RECOVERY OF METALS FROM ZINC-CARBON AND ALKALINE SPENT BATTERIES. American Journal of Applied Sciences, 11(9), 1566-1573. https://doi.org/10.3844/ajassp.2014.1566.1573

Abstract

The aim of this study is the thermal recovery of manganese and zinc from a mixture of zinc-carbon and alkaline spent batteries containing 40.9% of Mn and 30.1% of Zn after a preliminary physical treatment. Separation of the metals is carried out on the basis of their different phase change temperatures, the boiling point of zinc being 906°C and 1564°C that of Mn3O4, the main Mn-bearing phase in the mixture. After wet comminution and sieving to remove the anodic collectors and most of the chlorides contained in the mixture, chemical and X-Ray Powder Diffraction (XRPD) analyses were performed. The mixture was heated in CO2 atmosphere and the temperature raised, thus permitting the zinc oxide to be reduced to metallic zinc by the carbon present in the original mixture. Other tests were carried out by addition to the mixture of activated charcoal (95% C) or of the automotive shredder residue (fluff) containing 45% C.A zinc product was obtained suitable, after refining, for the production of new batteries. The treatment residue consisted of manganese and iron oxides that could be used to produce manganese-iron alloys. From these results, an integrated process for the recovery of the two metals was proposed.

Download

Keywords

  • Spent Batteries
  • Recycling
  • Manganese
  • Zinc
  • Metal Recovery