INVESTIGATION OF DISSOLUTION KINETICS OF Zn AND Mn FROM SPENT ZINC-CARBON BATTERIES IN SULPHURIC ACID SOLUTION

Abstract

The aim of this study is to examine the dissolution kinetics of zinc and manganese from spent zinc-carbon battery in sulphuric acid solution. The leaching experiments were carried under the following conditions: leaching temperatures of 30°C, 40°C and 50°C; sulphuric acid concentration of 0.5 M; stirring speed of 400 rpm; solid/liquid ratio of 5/500 g/mL and particle size of -53 µm. In these conditions, while all of the zinc was dissolved, about 69 % of manganese was dissolved. To determine the kinetics of dissolution of the zinc and manganese in sulphuric acid medium, different shrinking core models were applied to the dissolution recoveries obtained at variable temperatures. Kinetics analysis showed that the zinc and manganese dissolution from spent zinc-carbon battery could be described by diffusion from product layer. The activation energies (Ea) and Arrhenius constants for the dissolution reactions were calculated. Activation energies (Ea) were determined for Zn and Mn as 94.53 kJ/mol and 1.41 kJ/mol, respectively.

Keywords

• Leaching
• Dissolution kinetics
• Zn–C battery
• Zn
• Mn
• Activation energy
• Sulphuric acid

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