Issue
Korean Journal of Chemical Engineering,
Vol.26, No.4, 1053-1057, 2009
Electrochemical recovery of silver from waste aqueous Ag(I)/Ag(II) redox mediator solution used in mediated electro oxidation process
The paper presents a process for the electrochemical recovery of silver(Ag) by electro deposition on the electrode surface from the waste solutions of Ag(I)/Ag(II) redox system in nitric acid medium used for the mediated electrochemical process. Electrochemical recovery was carried out in an undivided cell with DSA-O2 electrodes at room temperature condition. At an optimized current density of 12 A/dm2, 99% of Ag recovery efficiency was achieved with high yield and low energy consumption. Experimental runs were made in order to observe the performance of the Ag recovery process. The operating conditions like current density, temperature and Ag(I) concentration of the electrolyte, the acid concentrations, agitation rate and inter-electrode distance were optimized.
[References]
  1. Cruz VR, Oropeza MT, Gonzalez I, Ponce-De-Leon C, J. Appl. Electrochem., 32(5), 473, 2002
  2. Fourcade F, Tzedakis T, Bergel A, Chem. Eng. Sci., 58(15), 3507, 2003
  3. Chen JP, Lim LL, Chemosphere, 60, 1384, 2005
  4. Pethkar AV, Paknikar KM, Process Biochem., 38, 855, 2003
  5. Lasko CL, Hurst MP, Environ. Sci. Technol., 33, 3622, 1999
  6. Hradil EF, Headil G, Met. Finish, 82, 85, 1984
  7. Raub E, Muller K, Fundamental of metal deposition, Elsevier Publishing Company, New York, 1967
  8. Lopez FA, Martin MI, Perez C, Lopez Delgado A, Water Res., 37, 3883, 2003
  9. Donmez B, Sevim F, Colak S, Chem. Eng. Technol., 24(1), 91, 2001
  10. Hor YP, Mohamed N, J. Appl. Electrochem., 33(3-4), 279, 2003
  11. Lee MS, Ahn JG, Ahn JW, Hydrometallurgy, 70, 23, 2003
  12. Dib A, Makhloufi L, Chem. Eng. Process., 43(10), 1265, 2004
  13. Mubarak AA, El-Shazly AH, Konsowa AH, Desalination, 167(1-3), 127, 2004
  14. Choi JY, Kim DS, J. Hazard. Mater., 99(2), 147, 2003
  15. Boyanov BB, Konareva VV, Kolev NK, Hydrometallurgy, 73, 163, 2004
  16. Nasi J, Hydrometallurgy, 73, 123, 2004
  17. Tricoli, Vattistas N, Marconi PF, J. Appl. Electrochem., 23, 390, 1993
  18. Fleischmann M, Pletcher D, Rafinski A, J. Appl. Electrochem., 1, 1, 1971
  19. Sulka GD, Jaskula M, Electrochim. Acta, 51(27), 6111, 2006
  20. Lehmani A, Turq P, Simonin JP, J. Electrochem. Soc., 143(6), 1860, 1996
  21. Balaji S, Chung SJ, Matheswaran M, Moon IS, Korean J. Chem. Eng., 24(6), 1009, 2007
  22. Balaji S, Chung SJ, Thiruvenkatachari R, Moon IS, Chem. Eng. J., 126(1), 51, 2007
  23. Balaji S, Kokovkin VV, Chung SJ, Moon IS, Water Res., 41, 1423, 2007
  24. Chung SJ, Balaji S, Matheswaran M, Ramesh T, Moon IS, Water Sci. Technol., 55, 261, 2007
  25. Kokovkin VV, Chung SJ, Balaji S, Matheswaran M, Moon IS, Korean J. Chem. Eng., 24(5), 749, 2007
  26. Lee JW, Chung SJ, Balaji S, Kokovkin VV, Moon IS, Chemosphere, 68, 1067, 2007
  27. Matheswaran M, Balaji S, Chung SJ, Moon IS, J. Ind. Eng. Chem., 13(2), 231, 2007
  28. Matheswaran M, Balaji S, Chung SJ, Moon IS, Electrochim. Acta, 53(4), 1897, 2007
  29. Matheswaran M, Balaji S, Chung SJ, Moon IS, Chem. Eng. J., 144, 28, 2008
  30. Matheswaran M, Chung SJ, Moon IS, Korean J. Chem. Eng., 25(5), 1031, 2008
  31. Jeffery GH, VOGEL, Textbook of quantitative chemical analysis 5th ed., Longman Scientific & Technical, London, 1989