Platinum Recovery from Industrial Process Solutions by Electrodeposition-Redox Replacement
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2018-11-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
10
Series
ACS Sustainable Chemistry and Engineering, Volume 6, issue 11, pp. 14631-14640
Abstract
In the current study, platinum - present as a negligible component (below 1 ppb, the detection limit of the HR-ICP-MS at the dilutions used) in real industrial hydrometallurgical process solutions - was recovered by an electrodeposition-redox replacement (EDRR) method on pyrolyzed carbon (PyC) electrode, a method not earlier applied to metal recovery. The recovery parameters of the EDRR process were initially investigated using a synthetic nickel electrolyte solution ([Ni] = 60 g/L, [Ag] = 10 ppm, [Pt] = 20 ppm, [H2SO4] = 10 g/L), and the results demonstrated an extraordinary increase of 3 × 105 in the [Pt]/[Ni] on the electrode surface cf. synthetic solution. EDRR recovery of platinum on PyC was also tested with two real industrial process solutions that contained a complex multimetal solution matrix: Ni as the major component (>140 g/L) and very low contents of Pt, Pd, and Ag (i.e., <1 ppb, 117 and 4 ppb, respectively). The selectivity of Pt recovery by EDRR on the PyC electrode was found to be significant - nanoparticles deposited on the electrode surface comprised on average of 90 wt % platinum and a [Pt]/[Ni] enrichment ratio of 1011 compared to the industrial hydrometallurgical solution. Furthermore, other precious metallic elements like Pd and Ag could also be enriched on the PyC electrode surface using the same methodology. This paper demonstrates a remarkable advancement in the recovery of trace amounts of platinum from real industrial solutions that are not currently considered as a source of Pt metal.Description
Keywords
Circular economy, Critical precious metals, Electrochemically assisted cementation, Electrochemistry, Green chemistry
Other note
Citation
Halli, P, Heikkinen, J J, Elomaa, H, Wilson, B P, Jokinen, V, Yliniemi, K, Franssila, S & Lundström, M 2018, ' Platinum Recovery from Industrial Process Solutions by Electrodeposition-Redox Replacement ', ACS Sustainable Chemistry and Engineering, vol. 6, no. 11, pp. 14631-14640 . https://doi.org/10.1021/acssuschemeng.8b03224