Performance-Based Selection of the Cathode Material for the Electrodeposition-Redox Replacement Process of Gold Recovery from Chloride Solutions

Ivan Korolev, Kirsi Yliniemi, Mari Lindgren, Leena Carpén, Mari Lundström (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)

    Abstract

    Recently, an emerging electrodeposition-redox replacement (EDRR) method was demonstrated to provide exceptionally efficient gold recovery from cyanide-free hydrometallurgical solutions. However, the effect of electrode material and its corrosion resistance in this process was overlooked, even though the EDRR process is carried out in extremely corrosive, acidic chloride solution that also contains significant amounts of strong oxidants, i.e., cupric ions. In the current study, nickel alloy C-2000, stainless steels 316L and 654SMO, and grade 2 titanium were for the first time critically evaluated as potential cathode materials for EDRR. The particular emphasis was placed on better understanding of the effect of cathode substrate on the overall efficiency of the gold recovery process. The use of a multiple attribute decision-making method of material selection allowed reaching of a well-founded compromise between the corrosion properties of the electrodes and process efficiency of gold extraction. The 654SMO steel demonstrated outstanding performance among the examined materials, as it enabled gold recovery of 28.1 pct after 3000 EDRR cycles, while its corrosion rate (CR) was only 0.02 mm/year.

    Original languageEnglish
    Pages (from-to)3107-3119
    JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
    Volume52
    Issue number5
    DOIs
    Publication statusPublished - Oct 2021
    MoE publication typeA1 Journal article-refereed

    Funding

    This research received funding from the European Union Framework Program for Research and Innovation Horizon 2020 under Grant Agreement No. 721385 (EU MSCA-ETN SOCRATES; project website: https://www.etn-socrates.eu ). The GoldTail (Grant No. 319691, ML) and NoWASTE (Grant No. 297962, KY) projects funded by the Academy of Finland are greatly acknowledged. The authors thank the laboratory personnel at VTT and Metso Outotec for their skillful technical assistance with the experimental work.

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