Kinetic analysis of total Lead from spent Car battery by hydrochloric acid leaching

Abstract

A study of the kinetic analysis of total lead from spent Car battery ash by hydrochloric acid<br />leaching has been examined. The physico-chemical analysis of the ash powder was carried out<br />by the Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and X–ray diffraction (XRD).<br />The effects of the acid concentration, temperature and particle size on the rate of battery ash<br />dissolution have been investigated. The dissolution rate increased with hydrochloric acid<br />concentration and temperature with decreasing particle size. The kinetic study indicated that the<br />dissolution of total lead could be represented by a shrinking core model with product layer<br />diffusion control mechanism at lower temperatures and a surface chemical reaction controlled<br />mechanism at higher temperatures. The activation energy, Ea and reaction order of 44.13 kJ/mol<br />and 1.14 were obtained, respectively for the dissolution process under the following established<br />conditions: solid/liquid ratio = 10 g/L, HCl concentration = 4M, temperature= 80 °C, Stirring<br />speed = 300 rpm, Particle size = 0.050–0.063 mm for 120 minutes.