Optimization, Kinetic Studies of Tin Leaching from Waste Printed Circuit Boards and Selective Tin Recovery from Its Pregnant Solution

To protect natural resources and avoid environmental pollution, an effective method is proposed to recover tin (Sn) from waste printed circuit boards (WPCBs). In order realize the efficient recovery of Sn, it necessary study effects experimental parameters on Sn leaching understand kinetics processes. The statistical mathematical technique (response surface methodology (RSM)) was used interactions rate optimize parameters. Moreover, a comprehensive understanding in hydrochloric acid solution obtained. results show that maximum 97.6% which obtained under following optimal condition: 74.1 °C, 4.94 mol/L HCl, 495.5 rpm, solid–liquid ratio 0.08 g/mL. mechanism controlled by mixed control reaction with activation energy 20.3 kJ/mol. A macroscopic kinetic equation also established, summarizes relationships between rates can predict results. pregnant leach recovered as stannic oxide (SnO2) precipitation-high temperature calcining technique. this paper, complete flowsheet for WPCBs developed.