Abstract
This paper examines dissolution kinetic data on the development of hydrometallurgical route for possible recovery of lead from spent motorcycle battery ash leached liquor in hydrochloric acid solution. The influence of acid concentration, reaction temperature, particle diameter, solid/liquid ratio and stirring rate on the dissolution rates has been investigated. The dissolution rates are greatly influenced by the reaction temperature, acid concentration, stirring rate, solid/ liquid ratio and particle diameter. In 8.42 M HCl and at 80 °C, about 82.2 % of the battery ash was dissolved within 120min using 0.050-0.063 mm particle diameter and solid/liquid ratio of 10g/L. The calculated activation energy, Ea, reaction order and Arrhenius constant from the experimental data were 36.40 kJ/mol, 0.76 and 24.53 s-1 respectively for the dissolution process. The kinetic data for the dissolution rates have been analyzed and were found to follow the shrinking core model for the diffusion control mechanism with surface chemical reaction as the rate determining step. Finally, the X-ray diffraction spectrum showed that about 18% of the initial solid material that constituted undissolved materials contained mainly silica (?-SiO2).