A future application of pulse plating–silver recovery from hydrometallurgical bottom ash leachant

H. Elomaa, P. Halli, T. Sirviö, K. Yliniemi, M. Lundström*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
115 Downloads (Pure)

Abstract

In the current study, electrodeposition-redox replacement was applied to a hydrometallurgical solution with the main elements of Ca (13.8 g L−1), Al (4.7 g L−1), Cu (2.5 g L−1), Zn (1.2 g L−1), Fe (1.2 g L−1), S (1 g L−1), Mg (0.8 g L−1), P (0.5 g L−1) and Ag (3.5 ppm). The solution originated from the leaching experiment of incinerator plant bottom ash, which was dissolved into 2 M HCl media at T = 30 °C. The resulting deposit on the electrode surface was analysed with SEM-EDS and the observed Ag/(Cu + Zn) ratio (0.3) indicated remarkable enrichment of silver on the surface, when compared to the ratio of these elements (Ag/(Cu + Zn)) in the solution (6.8 × 10−5). The enrichment of Ag vs. (Cu + Zn) could be demonstrated to increase ca. 4500 fold compared to the ratio of the elements in solution.

Original languageEnglish
Pages (from-to)253-257
Number of pages5
JournalTransactions of the Institute of Metal Finishing
Volume96
Issue number5
DOIs
Publication statusPublished - 3 Sep 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Bottom ash
  • circular economy
  • electrodeposition-redox replacement
  • leaching
  • silver recovery

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