Kinetic Modelling of Copper and Zinc Dissolution from Brass Obtained from Waste Electrical and Electronic Equipment

摘要

The leaching kinetics of copper and zinc from brass was investigated in sodium persulfate solution. The factors affecting the performance and efficiency of the leaching process, such as leaching time, acid concentration and temperature were separately investigated. The obtained results revealed that copper and zinc are successfully dissolved in a persulfate environment, especially for high temperature (60 °C) and oxidant concentration (0.3 M Na_2S_2O_8 solution). To define the exact geometry changes that appear a shrinking core model can be used. With the determination of pre-exponential constants, activation energies and reaction orders, the concentration and temperature dependence can be examined. The identified kinetic model can be used for describing similar processes involving dissolution of metals or alloys.