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Jian-Guang Y, Jie L, Si-Yao P, et al. A new membrane electro-deposition based process for tin recovery from waste printed circuit boards. J Hazard Mater. 2015;304:409-16doi: 10.1016/j.jhazmat.2015.11.007.
Jian-Guang, Y., Jie, L., Si-Yao, P., Yuan-Lu, L., & Wei-Qiang, S. (2016). A new membrane electro-deposition based process for tin recovery from waste printed circuit boards. Journal of hazardous materials, 304409-16. https://doi.org/10.1016/j.jhazmat.2015.11.007
Jian-Guang, Yang, et al. "A new membrane electro-deposition based process for tin recovery from waste printed circuit boards." Journal of hazardous materials vol. 304 (2016): 409-16. doi: https://doi.org/10.1016/j.jhazmat.2015.11.007
Jian-Guang Y, Jie L, Si-Yao P, Yuan-Lu L, Wei-Qiang S. A new membrane electro-deposition based process for tin recovery from waste printed circuit boards. J Hazard Mater. 2016 Mar 05;304:409-16. doi: 10.1016/j.jhazmat.2015.11.007. Epub 2015 Nov 10. PMID: 26595900.
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J Hazard Mater. 2016 Mar 05;304:409-16. doi: 10.1016/j.jhazmat.2015.11.007. Epub 2015 Nov 10.

A new membrane electro-deposition based process for tin recovery from waste printed circuit boards.

Journal of hazardous materials

Yang Jian-Guang, Lei Jie, Peng Si-Yao, Lv Yuan-Lu, Shi Wei-Qiang

Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China. Electronic address: [email protected].
  2. School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.

PMID: 26595900 DOI: 10.1016/j.jhazmat.2015.11.007

Abstract

The current research investigated a process combining leaching, purification and membrane electrodeposition to recover tin from the metal components of WPCBs. Experimental results showed that with a solid liquid ratio of 1:4, applying 1.1 times of stoichiometric SnCl4 dosage and HCl concentration of 3.5-4.0 mol/L at a temperature of 60-90°C, 99% of tin can be leached from the metal components of WPCBs. The suitable purification conditions were obtained in the temperature range of 30-45°C with the addition of 1.3-1.4 times of the stoichiometric quantity of tin metal and stirring for a period of 1-2h; followed by adding 1.3 times of the stoichiometric quantity of Na2S for sulfide precipitation about 20-30 min at room temperature. The purified solution was subjected to membrane electrowinning for tin electrodeposition. Under the condition of catholyte Sn(2+) 60 g/L, HCl 3 mol/L and NaCl 20 g/L, current density 200 A/m(2) and temperature 35°C, a compact and smooth cathode tin layer can be obtained. The obtained cathode tin purity exceeded 99% and the electric consumption was less than 1200 kW h/t. The resultant SnCl4 solution generated in anode compartment can be reused as leaching agent for leaching tin again.

Copyright © 2015 Elsevier B.V. All rights reserved.

Keywords: Chloride leaching; Membrane electrodeposition; Tin recovery; WPCBs

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