Gold Recovery from Chloride Leaching Solutions by Electrodeposition-Redox Replacement Method

Ivan Korolev, Eero Kolehmainen, Mika Haapalainen, Kirsi Yliniemi, Mari Lundström

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

Currently, the adsorption methods (e.g., CIP / CIL) are by far dominating the recovery of gold from leaching solutions, especially in cyanide media. However, gradual shift towards cyanide-free gold processes also requires new developments in the recovery technologies. High concentrations of base metal and impurities cause co-adsorption by activated carbon or ion exchange resins and consequently lower gold recovery. As an alternative solution, the electrodeposition-redox replacement (EDRR) method was recently demonstrated for recovery of gold from synthetic chloride solutions. In contrast to adsorption, EDRR does not require addition of chemicals in the process and is suitable for elemental gold recovery from chloride leaching solution. In this paper, cupric chloride solution from ore leaching was tested for applicability of the EDRR method. Obtained results demonstrate that gold can be recovered from industrial process solutions containing Au at ppm scale while the base metal (Cu) concentration was as high as 30 g/L and other impurities (mainly Fe, also Zn, Co and Ni) present at various levels between ppm and g/L. The final gold deposit was analyzed with scanning electron microscopy, which confirmed the recovery of gold from the solution. Further optimization of the EDRR process parameters could make it a viable alternative to existing best available technologies due to simplicity of the process flowsheet, energy efficiency and ability for selective recovery of elemental gold even from very low concentrations.
Original languageEnglish
Title of host publicationProceedings of the 10th European Metallurgical Conference
EditorsUlrich Waschki
Place of PublicationClausthal-Zellerfeld, Germany
PublisherGDMB Verlag GmbH
Pages623-630
Number of pages6
Volume2
ISBN (Print)978-3-940276-88-9
Publication statusPublished - Jun 2019
MoE publication typeA4 Article in a conference publication
EventEuropean Metallurgical Conference - Congress Center Düsseldorf Süd , Düsseldorf, Germany
Duration: 23 Jun 201926 Jun 2019
Conference number: 10
https://emc.gdmb.de

Conference

ConferenceEuropean Metallurgical Conference
Abbreviated titleEMC
CountryGermany
CityDüsseldorf
Period23/06/201926/06/2019
Internet address

Keywords

  • Chloride leaching
  • Electrodeposition
  • Gold
  • Impurities

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