A future application of pulse plating – silver recovery from hydrometallurgical bottom ash leachant. (3rd September 2018)

• Record Type: Journal Article
• Authors: Elomaa, H.; Halli, P.; Sirviö, T.; Yliniemi, K.; Lundström, M.
• Is Part Of: Transactions of the Institute of Metal Finishing. Volume 96:Number 5(2018)
• Page Start: 253
• Page End: 257
• Publication Date: 2018-09-03
• Subjects: Bottom ash -- leaching -- silver recovery -- electrodeposition-redox replacement -- circular economy; Metals -- Finishing -- Periodicals; Metals -- Surfaces -- Periodicals; Metallurgy -- Periodicals; 671.705
• DOI: 10.1080/00202967.2018.1507320
• Languages: English
• ISSNs: 0020-2967

Abstract

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.