Abstract
In this paper, a feasible process was proposed for the recovery of copper and tin from tinned copper. Tin is removed in H2SO4-CuSO4 solution. Then copper and tin are recovered via two-stage electrodeposition due to their differences in electrode potential. Finally, the tail liquid after electrolysis can be reused by adding Cu2(OH)2CO3 to realize the closed loop recycling of tin. The effects of leaching solution, reaction time and temperature on the separation of tin from waste tinned copper wire were studied. The composition of electrolyte, voltage and anode materials were also investigated on the effects of recovery rate of tin and copper. The results show that copper and tin can be separated well with CuSO4∙5H2O 120–140 g/L, H2SO4 75–100 g/L, temperature 30 °C and reaction time 30 min. When the concentration of HBO3 was 20 g/L, the optimal electrodeposition voltages of copper and tin are 2.00 V and 3.00 V, respectively. The recovery rate of copper is nearly 100%, while the direct recovery rate of tin is about 80%. Graphite anode is much better than stainless steel anode.
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