Ferric and Cupric Chloride Leaching of Valuable Metals from Process Residues

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Altinkaya, Pelin
dc.contributor.author Korolev, Ivan
dc.contributor.author Kolehmainen, Eero
dc.contributor.author Haapalainen, Mika
dc.contributor.author Lundström, Mari
dc.contributor.editor Waschki, Ulrich
dc.date.accessioned 2019-10-01T12:07:41Z
dc.date.available 2019-10-01T12:07:41Z
dc.date.issued 2019-06
dc.identifier.citation Altinkaya , P , Korolev , I , Kolehmainen , E , Haapalainen , M & Lundström , M 2019 , Ferric and Cupric Chloride Leaching of Valuable Metals from Process Residues . in U Waschki (ed.) , Proceedings of the 10th European Metallurgical Conference . vol. 2 , GDMB Verlag GmbH , Clausthal-Zellerfeld, Germany , pp. 821-829 , European Metallurgical Conference , Düsseldorf , Germany , 23/06/2019 . en
dc.identifier.isbn 978-3-940276-88-9
dc.identifier.other PURE UUID: 7d84fa0f-6a18-4bbb-9502-d99b5d272c51
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/ferric-and-cupric-chloride-leaching-of-valuable-metals-from-process-residues(7d84fa0f-6a18-4bbb-9502-d99b5d272c51).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/35016677/Altinkaya_et_al._2019_Ferric_and_Cupric_Chloride_Leaching_of_Valuable_Metals_from_Process_Residues.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/40537
dc.description | openaire: EC/H2020/721385/EU//SOCRATES
dc.description.abstract The object of the current study was to compare the extraction yields of various valuable metals from process residues by ferric and cupric chloride leaching as an alternative to cyanidation. Flotation tailings, with low amount of gold, copper, nickel, cobalt and zinc were used as a raw material. In the chloride leaching experiments, the effect of the oxidant type and concentration ([Fe3+] and [Cu2+] from 10 to 50 g/L), was investigated on the metals extraction. At the same time, pH (1 and 1.8), temperature (95 °C), solid/liquid ratio (25 %), oxygen feed rate (1200 mL/min), leaching time (24 h), and stirring rate (950 rpm) were kept constant. Additionally, the reference leaching experiment with sodium cyanide (NaCN) at 22 °C, pH = 11, solid/liquid ratio of 25 %, air feed rate 500 ml/min, stirring rate 400 rpm and 24 hours of leaching time was run to benchmark leaching efficiencies of cyanide-free processes. The results showed that the maximum gold extraction was observed with cyanidation (78 %) and followed byferric and cupric chloride leaching. For copper, the extractions were higher in chloride leaching (75 – 100 %) whereas cyanide could dissolve 50 % of copper. Extraction of nickel and zinc were slightly higher in ferric chloride leaching compared to cupric chloride leaching, but cobalt extraction was similar in both chloride leaching methods. However, extraction of these metals was insignificant in cyanide leaching. With these results, it seems that chloride leaching with the presence of cupric and ferric oxidants can be used as an alternative cyanide-free method for extraction of metals from process residues. en
dc.format.extent 821-829
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/H2020/721385/EU//SOCRATES
dc.relation.ispartof European Metallurgical Conference en
dc.relation.ispartofseries Proceedings of the 10th European Metallurgical Conference en
dc.relation.ispartofseries Volume 2 en
dc.rights openAccess en
dc.subject.other 215 Chemical engineering en
dc.subject.other recycling en
dc.subject.other material efficiency en
dc.title Ferric and Cupric Chloride Leaching of Valuable Metals from Process Residues en
dc.type A4 Artikkeli konferenssijulkaisussa fi
dc.description.version Peer reviewed en
dc.contributor.department Hydrometallurgy and Corrosion
dc.contributor.department Outotec Research Center
dc.contributor.department Department of Chemical and Metallurgical Engineering en
dc.subject.keyword 215 Chemical engineering
dc.subject.keyword recycling
dc.subject.keyword material efficiency
dc.identifier.urn URN:NBN:fi:aalto-201910015557
dc.type.version acceptedVersion

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