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Recycling of spent NiMH batteries

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Agarwal, V.
dc.contributor.author Khalid, Muhammad K.
dc.contributor.author Porvali, A.
dc.contributor.author Wilson, Benjamin P.
dc.contributor.author Lundström, Mari
dc.date.accessioned 2019-09-03T13:47:12Z
dc.date.available 2019-09-03T13:47:12Z
dc.date.issued 2019-12-01
dc.identifier.citation Agarwal , V , Khalid , M K , Porvali , A , Wilson , B P & Lundström , M 2019 , ' Recycling of spent NiMH batteries : Integration of battery leach solution into primary Ni production using solvent extraction ' , Sustainable Materials and Technologies , vol. 22 , e00121 . https://doi.org/10.1016/j.susmat.2019.e00121 en
dc.identifier.issn 2214-9937
dc.identifier.other PURE UUID: 96de0dff-2c71-473d-8414-06a44357eb9a
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/96de0dff-2c71-473d-8414-06a44357eb9a
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85070201688&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/92993725/CHEM_Agarwal_etal_Recycling_of_spent_NiMH_JSusmat.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/40086
dc.description.abstract The utilization of existing metallurgical infrastructure and integration of secondary process streams into primary metals production can provide advantages over separate recycling plants. This paper focuses on the integration of a pregnant leach solution (PLS) into a nickel production plant that contains Ni, Co, Zn, Mn, Fe, Al and Cd ions, derived from a NiMH recycling stream. The solution composition highlights the challenge related to spent battery investigations, as although toxic Cd is not present in NiMH battery chemistries, it ends up into the battery waste collection and prevents direct integration of the battery waste into the primary process. The aim of the study is to remove Zn, Fe, Al, Mn and Cd ions from the PLS, so that the Ni and Co remaining in solution could be integrated into the nickel production process. A two-step solvent extraction process using Di-2-ethylheyxl phosphoric acid (D2EHPA) was developed. In the first step, Zn, Al and Fe were removed at pH 1.5, whereas in the second step Cd and Mn were removed at pH 2.3. Different process parameters (pH, O/A ratio, temperature, extractant concentration, kinetics) were optimized at each step of the solvent extraction. The purified and fully integrable PLS was found to contain Ni ~28 g/L and Co ~3.7 g/L. en
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Elsevier
dc.relation.ispartofseries Sustainable Materials and Technologies en
dc.relation.ispartofseries Volume 22 en
dc.rights openAccess en
dc.title Recycling of spent NiMH batteries 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 Hydrometallurgy and Corrosion
dc.subject.keyword Circular economy
dc.subject.keyword McCabe-thiele diagrams
dc.subject.keyword Solvent extraction
dc.subject.keyword Spent NiMH batteries
dc.subject.keyword Stripping
dc.identifier.urn URN:NBN:fi:aalto-201909035128
dc.identifier.doi 10.1016/j.susmat.2019.e00121

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