MANGANESE RECOVERING FROM ALKALINE SPENT BATTERIES BY AMMONIUM PEROXODISULFATE

Paola Macolino, Adriana Loredana Manci, Ida De Michelis, Muresan Silviu Anton, Petru Ilea, Francesco Veglio

Abstract


The process of manganese removal from spent battery leaching solutions, with ammonium peroxodisulfate, prior to recovery of zinc by electrolysis is presented. The experiments were carried out according to a 23 full factorial design considering ammonium peroxodisulfate concentration, temperature and pH as factors investigated. The analysis of variance (ANOVA) was carried out on the precipitation yields of Mn and Zn after 30 min, 1h, 2h and 3h of reaction. Optimal conditions for obtaining Mn as MnO2 were 20 % (NH4)2S2O8, 90 °C and pH 6. Data from XRF and AAS during the reaction at different time are presented to analyse the kinetic behaviour of the system. The MnO2 precipitated and solutions have been characterized by XRF and XRD. The solid samples were kept at 800 °C for 1 h to produce chemical manganese dioxide (CMD) and were characterized by cyclic voltammetry for their electrochemical activity. The overall results denoted that chemical oxidation of manganese from spent batteries leaching solutions with ammonium peroxodisulfate is a suitable method for manganese removal as MnO2 prior zinc recovery by electrolysis, also production of a suitable product (CMD) and it could be used in a process for recycling spent batteries.


Keywords


alkaline spent batteries; CDM; selective precipitation; recovery

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References


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DOI: http://dx.doi.org/10.12776/ams.v19i3.163

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