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Improved Metal Circular Economy-Selective Recovery of Minor Ag Concentrations from Zn Process Solutions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Halli, Petteri
dc.contributor.author Elomaa, Heini
dc.contributor.author Wilson, Benjamin
dc.contributor.author Yliniemi, Kirsi
dc.contributor.author Lundström, Mari
dc.date.accessioned 2018-02-09T10:08:39Z
dc.date.available 2018-02-09T10:08:39Z
dc.date.issued 2017
dc.identifier.citation Halli , P , Elomaa , H , Wilson , B , Yliniemi , K & Lundström , M 2017 , ' Improved Metal Circular Economy-Selective Recovery of Minor Ag Concentrations from Zn Process Solutions ' , ACS Sustainable Chemistry and Engineering , vol. 5 , no. 11 , 7b02904 . https://doi.org/10.1021/acssuschemeng.7b02904 , https://doi.org/10.1021/acssuschemeng.7b02904 en
dc.identifier.issn 2168-0485
dc.identifier.other PURE UUID: fc330650-d8c2-46e4-812a-8c8ef953b07e
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/fc330650-d8c2-46e4-812a-8c8ef953b07e
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/16229397/acssuschemeng.7b02904.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/30039
dc.description.abstract Silver is a metal widely applied in renewable energy applications and therefore subject to resource scarcity. The paper presents a new approach for recovering silver from zinc-containing solutions mimicking hydrometallurgical base metal process solution. By nature, silver present in ores or concentrates is more noble than zinc and not effectively leached into the sulfate media during zinc hydrometallurgical processing. This paper presents a novel approach for concentrating and recovering silver present in minor amounts in zinc sulfate media. The electrodeposition–redox replacement (EDRR) method was investigated in synthetic zinc sulfate solutions ([Zn] = 60 g/L, [Ag] = 1 ppb–250 ppm, [H2SO4] = 10 g/L) containing silver as low as 1 ppb. The deposited metal coating was analyzed by electrochemical techniques and SEM-EDS. As a result, an enrichment of silver as nano- and microparticles on electrodes was evident. With the application of multiple EDRR steps (n = 160), the method was shown to result in a high purityAg layer (Ag/Zn ratio ≈ 1500 in the product) from solution with minor Ag content (Ag/Zn ratio ≈ 0.0017 in solution). Moreover, at the concentration levels studied, the EDRR method was shown to outperform conventional electrowinning (EW). en
dc.format.extent 9
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Volume 5, issue 11 en
dc.rights openAccess en
dc.title Improved Metal Circular Economy-Selective Recovery of Minor Ag Concentrations from Zn Process Solutions en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Chemical and Metallurgical Engineering
dc.contributor.department Department of Chemistry and Materials Science
dc.subject.keyword EDRR
dc.subject.keyword Silver recovery
dc.subject.keyword Zinc process solution
dc.subject.keyword Circular economy
dc.identifier.urn URN:NBN:fi:aalto-201802091536
dc.identifier.doi 10.1021/acssuschemeng.7b02904
dc.type.version publishedVersion

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