Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지
DOI QR코드

DOI QR Code

Leaching of Silver (Ag) from Electronic Scrap by Thiourea

전자스크랩으로부터 티오요소에 의한 은(Ag) 침출

  • So, Hong-Il (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Lee, Joo-eun (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Cho, Yeon-Chul (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Ahn, Jae-Woo (Department of Advanced Materials Science and Engineering, Daejin University) ;
  • Ryu, Ho-Jin (Yuchuntech)
  • Received : 2018.05.11
  • Accepted : 2018.06.06
  • Published : 2018.07.05
⟨ Previous Next ⟩

Abstract

The leaching behavior of silver from electronic scrap using acidic thiourea solution was studied. The results showed that the silver leaching percentage was affected by the concentration of thiourea and hydrochloric acid, the oxidant such as ferric ions, solid-liquid ratio, temperature, rpm, etc. The leaching percentage of silver decreased with an increase in the solid-liquid ratio, and the leaching rate of silver was enhanced by increasing the thiourea and hydrochloric acid concentration. However, when the concentration of hydrochloric acid and oxidant were increased above 1.0 M and 30 mM, respectively, the leaching rate of silver decreased. When the reaction temperature was above $50^{\circ}C$, the leaching rate of silver decreased because of the decomposition of thiourea. More than 99 % leaching of silver was achieved under the following conditions: thiourea conc. 0.8 M, HCl conc. : 0.5 M, Temp. : $35^{\circ}C$, leaching time : 4 hours, solid-liquid ratio : 25 g/L.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

References

  1. J. C. Lee, "Development of Commercial Technology for Recovering Precious Metals", KIGAM, Daejeon, Korea (2003).
  2. V. Bhat, P. Rao, and Y. Patil, Procedia-Social and Behavioral Sciences, 398-400, Elsevier Ltd. Selection and/or peer-review under responsibility of Symbiosis Institute of International Business (SIIB), India (2012).
  3. B. S. Kim, Trends in Metals & Materials Engineering 18, 21 (2005).
  4. J. L. Deutsch and D. B. Dreisinger, Hydrometallurgy 137, 157 (2013).
  5. C. Lei, B. Yan, T. Chen, X. L. Wang, and X. M. Xiao, J. Clean. Prod. 181, 408 (2018). https://doi.org/10.1016/j.jclepro.2018.01.243
  6. S. G. Kim, A study on the leaching of gold by acidothioureation and its solvent extraction with $D_2EHPA$, Ph. D. Dissertation, Korea Univ., Korea (1992).
  7. E. P. Diamandis and T. P. Hadjiioannou, Mikrochim. Acta 68, 256 (1977).
  8. S. Ahmad, A. A. Isab, H. P. Perzanowski, King Fahd Univ. of Petroleum and Minerals 27, 782 (2002).
  9. Y. C. Cho, J. of Korean Inst. of Resources Recycling 26, 62 (2017).
  10. D. Calla-Choque, F. Nava-Alonso, and J. C. Fuentes-Aceituno, J. Hazard. Mater. 317, 441 (2016).
  11. V. Gaspar, A. S. Mejerovich, M. A. Meretukov, and J. Schmiedl, Hydrometallurgy 34, 370 (1994).
  12. K. T. Chang, J. Ind. Sci., Cheongju Univ., 23, 57 (2005).
  13. D. S. R. Murthy, and P. M. Prasad, Hydrometallurgy 42, 28 (1996).
  14. B. J. Kim, K. H. Cho, N. C. Choi, and C. Y. Park, Econ. Environ. Geol. 46, 29 (2013). https://doi.org/10.9719/EEG.2013.46.1.29
  15. C. W. Won and T. R. Cho, J. Kor. Inst. Met. & Mater. 12, 495 (1985).
  16. J. Ficeriova, P. Balaz, E. Dutkova, and E. Gock, The Open Chemical Engineering Journal 2, 6 (2008). https://doi.org/10.2174/1874123100802010006
  17. T. H. Nguyen, L. Wang, and M. S. Lee, Korean J. Met. Mater. 55, 247 (2017). https://doi.org/10.3365/KJMM.2017.55.4.247
  18. S. G. Kim, H. Y. Lee, and J. K. Oh, J. of Koearn Inst. of Resources Recycling 3, 20 (1994).
  19. M. Pourbaix, Atlas of Electrochemical Equilibria in Aqueous Solutions, 394, Pergamon Press, London (1966).
  20. J. Park, Y. Jung, P. Kusumah, B. Dilasari, H. Ku, H. Kim, K. Kwon, and C. K. Lee, Korean J. Met. Mater. 22, 907 (2016)