Abstract: A new hydrometallurgical progress based on membrane electrodeposition was proposed to effectively extract tin from metal fractions of WPCBs(waste printed circuit boards). Leaching experiment results showed that under the conditions of temperature 40℃， Sn⁴⁺ concentration 50g/L， HCl concentration 4mol/L， liquid (ml) to solid (g) ratio 5∶1 and cycle 3 times， the leaching efficiency of tin was about 96%， and the resultant Sn²⁺ concentrated in the leach solution was 68.58g/L. The electrodeposition tests indicated that under the condition of current density 200A/m²， temperature 35℃， H⁺ concentration 3mol/L and Sn²⁺ concentration 40~100g/L， a compact and smooth cathode tin layer can be obtained after 8h electrodeposition. The current efficiency was 97.51% and the electric consumption was less than 1200kW h/t.

Key words: waste printed circuit boards;tin recovery, chlorination leaching, membrane electrodeposition